Wikipedia:WikiProject Geology/List of articles

This list of all articles managed by WikiProject Geology was generated using a list generated by a Wikipedia Release Version tool. It is current as of 17 May 2012.


 * 100,000-year problem
 * 1575 Valdivia earthquake
 * 1751 Port-au-Prince earthquake
 * 1857 Basilicata earthquake
 * 1906 San Francisco earthquake
 * 1908 Messina earthquake
 * 1931 Nicaragua earthquake
 * 1949 Ambato earthquake
 * 1949 Queen Charlotte Islands earthquake
 * 1950 Assam – Tibet earthquake
 * 1960 Valdivia earthquake
 * 1967 Caracas earthquake
 * 1968 Illinois earthquake
 * 1971 San Fernando earthquake
 * 1972 Nicaragua earthquake
 * 1980 eruption of Mount St. Helens
 * 1992 Landers earthquake
 * 1994 Northridge earthquake
 * 1997 Fiji-Tonga earthquake
 * 1997 Jabalpur earthquake
 * 1997 Qayen earthquake
 * 1999 Chamoli earthquake
 * 2002 Molise earthquake
 * 2003 Boumerdès earthquake
 * 2004 Indian Ocean earthquake and tsunami
 * 2006 Kamchatka earthquakes
 * 2007–2008 Nazko earthquakes
 * 2008 Chino Hills earthquake
 * 2008 Iceland earthquake
 * 2008 Illinois earthquake
 * 2008 Kyrgyzstan earthquake
 * 2008 Panzhihua earthquake
 * 2008 Sichuan earthquake
 * 2008 Yingjiang earthquakes
 * 2010 Baja California earthquake
 * 2012 Indian Ocean earthquake
 * 25143 Itokawa
 * 773 Irmintraud
 * A-index
 * A. Morley Davies
 * AAG Gold Medal
 * AAPG Bulletin
 * ABISMO
 * AFm phase
 * AL 200-1
 * AL 333
 * Aachenosaurus
 * Aalenian
 * Aarhus (meteorite)
 * Abavornis
 * Abecediary
 * Abee (meteorite)
 * Abelisaur
 * Abelsonite
 * Abenakiite-(Ce)
 * Aber Dinlle Fault
 * Aber Fault
 * Aber Richard Fault
 * Aberconway Medal
 * Aberdaron Fault
 * Abergwesyn Fault
 * Abernathyite
 * Aberratiodontus
 * Abertridwr Fault
 * Abhurite
 * Abiogenesis
 * Abitibi greenstone belt
 * Abraham Gottlob Werner
 * Abraham Ortelius
 * Abraum salts
 * Absaroka sequence
 * Absolute dating
 * Abyss Pool
 * Abyssal channel
 * Abyssal fan
 * Abyssal hill
 * Abyssal plain
 * Acadian orogeny
 * Acanthite
 * Acanthodes
 * Acanthopholis
 * Acasta Gneiss
 * Accretion (geology)
 * Accretionary wedge
 * Accumulation zone
 * Acheronodon
 * Acherontemys
 * Achillesaurus
 * Achondrite
 * Acicular (crystal habit)
 * Acid maceration
 * Acorn Fault
 * Acraman crater
 * Acritarch
 * Acrophoca
 * Acrotemnus
 * Actinocrinites
 * Actinolite
 * Active fault
 * Acuminite
 * Adakite
 * Adam Dziewonski
 * Adam Sedgwick
 * Adamantina Formation
 * Adamantine Spar
 * Adamite
 * Adams mammoth
 * Adamsite-(Y)
 * Adams–Williamson equation
 * Adaptive radiation
 * Adel Mountains Volcanic Field
 * Adelite
 * Adelobasileus
 * Adelospondyli
 * Adelphailurus
 * Aden Ridge
 * Adhi Kot (meteorite)
 * Adinotherium
 * Adularia
 * Advanced Spaceborne Thermal Emission and Reflection Radiometer
 * Aegialornis
 * Aegir Ridge
 * Aegirine
 * Aellopos (fish)
 * Aelurognathus
 * Aenigmatite
 * Aepycamelus
 * Aerinite
 * Aeromagnetic survey
 * Aeronian
 * Aeschynite-(Ce)
 * Aeschynite-(Y)
 * Aetobatus poeyi
 * Aetokremnos
 * Aetonyx
 * Afghanite
 * Afon Saint Fault
 * African Plate
 * African superswell
 * Afro-Eurasia
 * Afro-Eurasia-America
 * Afterdamp
 * Afwillite
 * Agardite
 * Agassiz Glacier
 * Agate
 * Age of the Earth
 * Agen (meteorite)
 * Ageostrophy
 * Agglomerate
 * Aggradation
 * Aglaspidida
 * Agnosphitys
 * Agnostus
 * Agrinierite
 * Agriotherium
 * Agrogeologist
 * Agrogeology
 * Agrominerals
 * Aguilarite
 * Ahlfeldite
 * Ahu Akivi
 * Ahu Tongariki
 * Aikinite
 * Ailsacrinus
 * Aira Caldera
 * Aivukus
 * Ajoite
 * Akaganéite
 * Akazaki Formation
 * Akbarpur (meteorite)
 * Akdalaite
 * Akhtenskite
 * Akik
 * Akilia
 * Akimotoite
 * Aksayan
 * Aktashite
 * Al-Khod Conglomerate
 * Alabandite
 * Alabaster
 * Alacranite
 * Aladdin (crater)
 * Alagomyidae
 * Alanah Woody
 * Alarsite
 * Alaska-Aleutian megathrust
 * Albanerpeton
 * Albareto (meteorite)
 * Albert David Hager
 * Albert Oppel
 * Alberta Group
 * Albertite
 * Albian
 * Albian Sands
 * Albionbaataridae
 * Albisaurus
 * Albite
 * Albrechtschraufite
 * Albumares brunsae
 * Alcoota
 * Aldermanite
 * Aleksite
 * Alert Bay Volcanic Belt
 * Aleutian Trench
 * Alexander Keyserling
 * Alexis A. Julien
 * Alexornis
 * Alfred Church Lane
 * Alfred John Jukes-Browne
 * Alfred Tylor
 * Alfred Wegener
 * Alginite
 * Algoman orogeny
 * Ali Baba (crater)
 * Alice Springs Orogeny
 * Alismaticarpum
 * Allabogdanite
 * Allan Hills 84001
 * Allan V. Cox
 * Allanite
 * Allargentum
 * Allaru Formation
 * Allegan (meteorite)
 * Alleghanian orogeny
 * Allegheny Formation
 * Allegheny Front
 * Allende meteorite
 * Allington Quarry
 * Allison Formation
 * Allison Glacier (Antarctica)
 * Allison Glacier (Heard Island)
 * Alloa Lea Quarry Cave
 * Allochem
 * Allochthon
 * Alloclasite
 * Allophane
 * Allosauridae
 * Allt y Crib Fault
 * Allt y Grug Fault
 * Alluaudite
 * Alluvial desert
 * Alluvial fan
 * Alluvium
 * Almandine
 * Almendres Cromlech
 * Alocodon
 * Alopecocyon
 * Alpha Ridge
 * Alpheus Spring Packard
 * Alpine Fault
 * Alpine orogeny
 * Alstonite
 * AltaRock Energy
 * Altaite
 * Altar Stone (Stonehenge)
 * Altavista petroglyph complex
 * Altendorf (megalithic tomb)
 * Althupite
 * Altispinax
 * Altyn Tagh fault
 * Alum Bluff Formation
 * Alum shale
 * Aluminite
 * Aluminium silicate
 * Aluminosilicate
 * Alunite
 * Alunogen
 * Alvar
 * Alvarez hypothesis
 * Alvarezsaurus
 * Alwyn Robbins
 * Alyn Valley Fault
 * Amadeus Basin
 * Amagodani Formation
 * Amarantite
 * Amargatitanis
 * Amargosa Chaos
 * Amasia (continent)
 * Amazon Canyon
 * Amazonian shield
 * Amazonite
 * Ambapur Nagla
 * Amber
 * Ambiortus
 * Amblygonite
 * Amboni Caves
 * Ambulocetidae
 * Amelia Creek crater
 * Ameribaatar
 * American Association of Petroleum Geologists
 * American Geophysical Union
 * American–Antarctic Ridge
 * Ames crater
 * Amesite
 * Amethyst
 * Ametrine
 * Amguid crater
 * Amicite
 * Amino acid dating
 * Ammolite
 * Ammonium bituminosulfonate
 * Amole Formation
 * Amoreira-Porto Novo Members
 * Ampelomeryx
 * Amphibamus
 * Amphibole
 * Amphibolite
 * Amphicyon
 * Amphoterite
 * Amplectobelua
 * Amplitude versus offset
 * Ampthill Clay
 * Amundsen Plain
 * Amurian Plate
 * Amygdule
 * Amynodontidae
 * An Introduction to the Rock-Forming Minerals
 * Anachlysictis
 * Anafon Fault
 * Anagale
 * Anahim Volcanic Belt
 * Anahim hotspot
 * Anakena
 * Analcime
 * Anancus
 * Anand Mohan
 * Anandite
 * Anapaite
 * Anastasia Formation
 * Anatalavis
 * Anatase
 * Anatolian Plate
 * Anatoly Konstantinovich Rozhdestvensky
 * Ancaster stone
 * Ancestral Thames
 * Anchialine cave
 * Anchialine pool
 * Anchisauria
 * Anchisauridae
 * Anchitheriomys
 * Anchitherium
 * Ancistrocrania
 * Ancylite
 * Ancylopoda
 * Ancylus Lake
 * Andalusite
 * Andean Geology
 * Andersonite
 * Andesite
 * Andinichthyidae
 * Andorite
 * Andradite
 * Andrew H. Knoll
 * Andrew Ketcham Barnett
 * Andrew Long
 * Andrias scheuchzeri
 * Andrija Mohorovičić
 * André Cailleux
 * Andura
 * Anelastic attenuation factor
 * Anfesta stankovskii
 * Angadipuram Laterite
 * Angers (meteorite)
 * Anglesite
 * Angloposeidon
 * Angono Petroglyphs
 * Angostura Colorada Formation
 * Angoumian
 * Angrite
 * Angwa Sandstone Formation
 * Anhydrite
 * Aniksosaurus
 * Animikie Group
 * Anisian
 * Ankalagon saurognathus
 * Ankarafantsika Formation
 * Ankazomihaboka Formation
 * Ankerite
 * Ankober (meteorite)
 * Anlong (meteorite)
 * Annabergite
 * Annite
 * Annual Review of Earth and Planetary Sciences
 * Anomalocaridid
 * Anomalocaris
 * Anomocephalus
 * Anomoepus
 * Anoplotheriidae
 * Anorthite
 * Anorthosite
 * Anoxic event
 * Anta Grande do Zambujeiro
 * Antarctic Plate
 * Antarctic continental shelf
 * Antarcticite
 * Anteclise
 * Antediluvian
 * Anthodite
 * Anthophyllite
 * Anthracite
 * Anthraconite
 * Anthracosaurus
 * Anthracotheriidae
 * Anthracotherium
 * Anthrocene
 * Anthropic rock
 * Anthropocene
 * Anthropodyptes
 * Anthropornis
 * Antiarchi
 * Anticline
 * Antidune
 * Antitaenite
 * Antler orogeny
 * Antonin Fritsch
 * Antrim Shale
 * Anyolite
 * Aorounga crater
 * Aouelloul crater
 * Apachite
 * Apateodus
 * Apateopholis
 * Apatite
 * Apatodon
 * Apatornis
 * Apennine Mountains
 * Aphaneramma
 * Aphanite
 * Aphthoroblattina
 * Apidium
 * Apiocrinites
 * Aplite
 * Apophyllite-(KF)
 * Appalachia (Mesozoic)
 * Apparent polar wander
 * Appekunny Formation
 * Appley Bridge meteorite
 * April 2010 Sumatra earthquake
 * Apsaravis
 * Aptian
 * Aptian extinction
 * Apulian Plate
 * Aquifer
 * Aquifers in the United States
 * Aquitanian (stage)
 * Aquitard
 * Arabian-Nubian Shield
 * Arabian Plate
 * Aragonite
 * Aragosaurus
 * Araguainha crater
 * Arandaspida
 * Arandaspis
 * Arapahoe Formation
 * Arbol Solo (meteorite)
 * Arcadia Formation
 * Archaea
 * Archaeocidaris
 * Archaeodontosaurus
 * Archaeogeryon
 * Archaeohyracidae
 * Archaeomagnetic dating
 * Archaeomeryx
 * Archaeopithecidae
 * Archaeopsittacus
 * Archaeopterygidae
 * Archaeopterygiformes
 * Archaeopteryx
 * Archaeorhynchus
 * Archaeornithomimus
 * Archaeospheniscus
 * Archaeospheniscus lowei
 * Archaeospheniscus wimani
 * Archaeosyodon
 * Archaeotrogonidae
 * Archaeovenator
 * Archean
 * Archean life in the Barberton Greenstone Belt
 * Archegosaurus
 * Archeolimulus
 * Archeriidae
 * Archetypomys
 * Archibald Geikie
 * Archie's law
 * Archie (meteorite)
 * Archimylacris
 * Archipelagic apron
 * Arcillas de Morella Formation
 * Arctic (journal)
 * Arctic Cordillera
 * Arctic Lowlands
 * Arctic geoengineering
 * Arctica
 * Arctognathus
 * Arctops
 * Arcubisite
 * Ardaite
 * Ardgroom
 * Arenicolites
 * Arenig
 * Arenite
 * Arfvedsonite
 * Argana Formation
 * Arganaceras
 * Argentite
 * Argiles d'Octeville
 * Argiles de Chatillon Formation
 * Argiles du Gault
 * Argillaceous minerals
 * Argillaceous schist
 * Argutite
 * Argyrodite
 * Argyrolagus
 * Argyrosaurus
 * Aristosuchus
 * Arizona Accelerator Mass Spectrometry Laboratory
 * Arizona Geological Society
 * Arizona Geological Survey
 * Arizona Mining and Mineral Museum
 * Arkarua
 * Arkenu structures
 * Arkose
 * Armalcolite
 * Armor (hydrology)
 * Armorican terrane
 * Armour (anatomy)
 * Arnold Hague
 * Arnold Henry Guyot
 * Arnold von Lasaulx
 * Arroyo Aguiar (meteorite)
 * Arsenate minerals
 * Arsenite minerals
 * Arsenopyrite
 * Artesian aquifer
 * Arthog – Caerdeon Fault
 * Arthur Edmund Seaman
 * Arthur Holmes
 * Arthur L. Day Prize and Lectureship
 * Arthurite
 * Artificial reef
 * Artinite
 * Artinskian
 * Artoles Formation
 * Arundel Formation
 * Arundian
 * Arville Irving Levorsen
 * Arête
 * Asama Volcano Museum
 * Asbestos
 * Asencio Formation
 * Ashburtonite
 * Ashfield Brick Pits
 * Ashizawa Formation
 * Ashoverite
 * Ashstone
 * Asiaceratops
 * Asiahesperornis
 * Asiamerica
 * Asiamericana
 * Asiatosaurus
 * Aso Rock
 * Aspen Mountain (Wyoming)
 * Asperity (geotechnical engineering)
 * Aspidella
 * Aspidorhynchiformes
 * Aspidorhynchus
 * Aspy Fault
 * Asselian
 * Assise
 * Assisi (meteorite)
 * Association for Women Geoscientists
 * Association of American Geologists and Naturalists
 * Association of American State Geologists
 * Association of Applied Geochemists
 * Association of Environmental & Engineering Geologists
 * Asteroid
 * Asthenosphere
 * Astrapotheria
 * Astrapotherium
 * Astraspida
 * Astraspis
 * Astrochronology
 * Astrodon
 * Astrogeology Research Program
 * Astronomy & Geophysics
 * Astronomy and Geophysics
 * Astrophyllite
 * Asylosaurus
 * Atacamite
 * Ataxite
 * Atdabanian
 * Ateleaspis
 * Athabasca Basin
 * Athabascaite
 * Atlantic coastal plain
 * Atlantica
 * Atlantis Massif
 * Atlantosaurus
 * Atlascopcosaurus
 * Atmosphere of Earth
 * Atrypa
 * Attrition (weathering)
 * Aubrey holes
 * Aubrite
 * Auca Mahuevo
 * Aucasaurus
 * Auerlite
 * Augen
 * Augite
 * August Breithaupt
 * Auguste Michel-Lévy
 * Aulacocephalodon
 * Aulacogen
 * Aulophyseter
 * Aurelia and Blue Moon
 * Aurichalcite
 * Auricupride
 * Aurostibite
 * Ausia (animal)
 * Austin Chalk
 * Australasian strewnfield
 * Australian Shield
 * Australite
 * Australodocus
 * Australopithecus afarensis
 * Australosyodon
 * Authigenic
 * Automated mineralogy
 * Autunite
 * Avak crater
 * Avalanche
 * Avalonia
 * Avanhandava (meteorite)
 * Avebury
 * Aveline's Hole
 * Avemetatarsalia
 * Avenue (archaeology)
 * Aviatyrannis
 * Avipes
 * Avisauridae
 * Avisaurus
 * Avogadrite
 * Avon Park Formation
 * Avulsion (river)
 * Awaruite
 * Awatere Fault
 * Axinite
 * Axton Fault
 * Aymestry Limestone
 * Ayusokkanian
 * Azendohsaurus
 * Azoic Age
 * Azores Triple Junction
 * Azores hotspot
 * Azurite
 * B. Clark Burchfiel
 * BP Structure
 * BS 5930
 * Babefphite
 * Babingtonite
 * Back-arc basin
 * Back-stripping
 * Backwater (river)
 * Baddeleyite
 * Badjcinus
 * Badlands
 * Badlands Guardian
 * Baetylus
 * Bagaraatan
 * Bagua Formation
 * Bahariya Formation
 * Bahia Series
 * Bahram Akasheh
 * Baikal Rift Zone
 * Bainoceratops
 * Bajocian
 * Bakerite
 * Bakesaurus
 * Bakken formation
 * Bala - Llanelidan Fault
 * Bala Fault
 * Bala Series
 * Balabansai Formation
 * Balabansai Svita
 * Balancing rock
 * Balanerpeton
 * Balangeroite
 * Balch Cave
 * Balcoracania
 * Balcoracania dailyi
 * Bald Eagle Formation
 * Baldonnel Formation
 * Ball clay
 * Balle (runemaster)
 * Balleny hotspot
 * Ballytober Fault
 * Balochisaurus
 * Baltic Ice Lake
 * Baltic Plate
 * Baltic Shield
 * Baltic amber
 * Baltic area runestones
 * Baltica
 * Baltoeurypterus
 * Banda Sea Plate
 * Banded iron formation
 * Banff Formation
 * Bangladesh Agricultural Research Institute
 * Bangong suture
 * Bangudae Petroglyphs
 * Bangweulu Block
 * Bank (geography)
 * Bank erosion
 * Banwell Caves
 * Banwell Ochre Caves
 * Baotite
 * Bar (river morphology)
 * Baraboo Range
 * Bararite
 * Barawertornis
 * Barbertonite
 * Barbourofelidae
 * Barents Basin
 * Bargate stone
 * Barnack
 * Barnenez
 * Barre Granite
 * Barremian
 * Barrerite
 * Barringer Slough
 * Barstowite
 * Bartonian
 * Barun Goyot Formation
 * Bary Glacier
 * Baryte
 * Basal sliding
 * Basalt
 * Basalt fan structure
 * Basanite
 * Basement (geology)
 * Bashful elephant
 * Bashkirian
 * Basilosauridae
 * Basin and Range Province
 * Basin and range
 * Bastnäsite
 * Bath Stone
 * Batholith
 * Bathonian
 * Bathvillite
 * Bathygnathus
 * Bathymetric chart
 * Bathyopsis
 * Batoka Formation
 * Batrachosauria
 * Batrachosuchus
 * Baudissin Glacier
 * Bauria
 * Bauru Group
 * Baurutitan
 * Bauxite
 * Bayan Bologai Formation
 * Bayan Shireh Formation
 * Bayfield group
 * Bayin-Gobi Formation
 * Bayldonite
 * Bayosaurus
 * Beach ridge
 * Beacon Supergroup
 * Beacon sandstone
 * Beaconella
 * Beaconites
 * Beaghmore
 * Bear Cave
 * Bear Gulch Limestone
 * Bear Valley Strip Mine
 * Bearpaw Formation
 * Beaufort Group
 * Beaufort Series
 * Beaverhead crater
 * Beaverhill Lake Group
 * Becke line test
 * Becklespinax
 * Becquerelite
 * Bed (geology)
 * Bed load
 * Bed material load
 * Beddgelert Fault
 * Bedform
 * Bediasite
 * Bedout
 * Bedrock
 * Beech Hill Fault
 * Beecher's Trilobite Bed
 * Beecher's Trilobite type preservation
 * Beelemodon
 * Beenalaght
 * Behemotops
 * Beijing Anomaly
 * Belantsea
 * Belcoo Fault
 * Belemnitella
 * Beleuta Svita
 * Belgian Pool
 * Bellacartwrightia
 * Bellefonte Formation
 * Bellingshausen Plain
 * Bellingshausen Plate
 * Belloy Formation
 * Bellusaurus
 * Belly River Group
 * Belonochasma
 * Belt Supergroup
 * Bematherium
 * Bembridge Beds
 * Bemolanga
 * Ben Peach
 * Bench (geology)
 * Benitoite
 * Benjamin Kendall Emerson
 * Benmoreite
 * Bennettitales
 * Bennettites
 * Beno Gutenberg
 * Benthic boundary layer
 * Benton Fault
 * Benton Springs Fault
 * Bentonite
 * Bentorite
 * Berach Fault
 * Beraunite
 * Bergenite
 * Bergschrund
 * Bering Canyon
 * Beringia
 * Berkeley Geochronology Center
 * Berlinite
 * Bermuda hotspot
 * Bernard Chouet
 * Bernard du Bus de Gisignies
 * Bernardodon
 * Berriasian
 * Berryite
 * Berserker Range
 * Berthierite
 * Bertrandite
 * Berw Fault
 * Berycopsis
 * Beryl
 * Beryllonite
 * Beryozovskoye deposit
 * Besa River Formation
 * Betafite
 * Betasuchus
 * Bethel Fault
 * Bettws Fault
 * Beudantite
 * Beyenchime-Salaatin crater
 * Biehlite
 * Bienosaurus
 * Big Cave
 * Big Clifty Sandstone
 * Big Dan Mine
 * Big Snowy Group
 * Big Tom, Bronx
 * Bigach crater
 * Bighorn Basin
 * Bihariosaurus
 * Bilinite
 * Billabong
 * Billietite
 * Billman Creek Formation
 * Bimodal volcanism
 * Binghamite
 * Biochron
 * Bioclast
 * Bioerosion
 * Biogeochemical cycle
 * Biogeochemistry
 * Biogeology
 * Biogeomorphology
 * Biogeophysics
 * Biolith
 * Biorhexistasy
 * Biostratigraphy
 * Biotite
 * Biozone
 * Birbalomys
 * Bird River greenstone belt
 * Birdsong Sandstone
 * Birefringence
 * Birgeria
 * Birkenia
 * Birkrigg stone circle
 * Birnessite
 * Bisbee Blue
 * Biscayne Aquifer
 * Bishop's Frome Limestone
 * Bishop Tuff
 * Bismutite
 * Bison antiquus
 * Bisonalveus
 * Bissekty Formation
 * Bissett Formation
 * Bisti/De-Na-Zin Wilderness
 * Bitectiporidae
 * Bituminous coal
 * Bituminous shale
 * Bixbyite
 * Björketorp Runestone
 * Björn Kurtén
 * Black Creek Formation
 * Black Lakes of Jumbura
 * Black Peaks Formation
 * Black River Escarpment (Wisconsin)
 * Black Stone
 * Black metal (mineralogy)
 * Black smoker
 * Blackdamp
 * Blackrock (geology)
 * Blaenavon Fault
 * Blaenhirwaun Thrust
 * Blake River Megacaldera Complex
 * Blanco Fracture Zone
 * Blapsium
 * Bleb (mineralogy)
 * Blesa Formation
 * Blikanasauridae
 * Blikanasaurus
 * Blisworth Limestone
 * Blood Falls
 * Bloomsburg Formation
 * Blowing Stone
 * Blue Lias
 * Blue ground
 * Blue hole
 * Blueschist
 * Bluesky Formation
 * Bluestone
 * Bluff Dale Sandstone
 * Blufftown Formation
 * Blythe Intaglios
 * Bodafon Thrust
 * Bodelwyddan Fault
 * Bodhi stones
 * Body wave magnitude
 * Boehmite
 * Boesmansgat
 * Bogen Glacier
 * Bohdašín Formation
 * Bohonagh
 * Bolca
 * Boleite
 * Boltwoodite
 * Boltysh crater
 * Boluochia
 * Bonaccordite
 * Bonatitan
 * Boninite
 * Bonnet Plume Formation
 * Bonneville Flood
 * Book Cliffs
 * Boonton Formation
 * Boracite
 * Borate minerals
 * Borden Formation
 * Boreal Sea
 * Borealosaurus
 * Boreaspis
 * Boreotropical flora
 * Borhyaena
 * Borhyaenidae
 * Boring (earth)
 * Borissiakia
 * Bornes Massif
 * Bornhardt
 * Bornite
 * Borogovia
 * Borra Caves
 * Borrowdale Volcanic Group
 * Borup Fiord Pass
 * Boso Triple Junction
 * Bostobe Svita
 * Boston Mountains
 * Bostonite
 * Botallackite
 * Botetourt Springs, Virginia
 * Bothriodon
 * Bothriogenys
 * Bothriospondylus
 * Bottleneck Peak and Moon
 * Boucle du Baoulé National Park
 * Boudinage
 * Bouguer anomaly
 * Boulangerite
 * Boulder
 * Boulder Batholith
 * Bouldnor Formation
 * Bouma sequence
 * Bournonite
 * Boussingaultite
 * Bouvet Triple Junction
 * Bovedy (meteorite)
 * Bowen's reaction series
 * Bowie hotspot
 * Bowieite
 * Box Canyon, Colorado
 * Box Fault
 * Boxhole crater
 * Brachalletes
 * Brachycrus
 * Brachydiastematherium
 * Brachyopidae
 * Brachypodosaurus
 * Brackish marsh
 * Bradgatia
 * Bradyseism
 * Braggite
 * Brallier Formation
 * Bramatherium
 * Brammallite
 * Branner Earth Sciences Library
 * Brassfield Formation
 * Bratschen
 * Braunite
 * Breccia
 * Breccia pipe
 * Brent crater
 * Breviceratops
 * Breviparopus
 * Briançonnais zone
 * Briartite
 * Bridge River Ash
 * Bridge River Ocean
 * Bridge of the Gods (land bridge)
 * Bright spot
 * Brightseat Formation
 * Bristol Channel Fault Zone
 * Bristol Diamonds
 * Brithopus
 * British Geological Survey
 * British Tertiary Volcanic Province
 * Brito-Arctic province
 * Brittle-ductile transition zone
 * Britton Formation
 * Broadford Beds Formation
 * Broby bro Runestones
 * Brochantite
 * Brockram
 * Brodavis
 * Brohisaurus
 * Broken Hill ore deposit
 * Bromargyrite
 * Bromide Formation
 * Bronnant Fault
 * Bronnant Fault Zone
 * Bronson Hill Island Arc
 * Brontops
 * Brontoraptor
 * Brontotherium
 * Bronzite
 * Broome Sandstone
 * Brothers Fault
 * Brothers Fault Zone
 * Brothers volcano
 * Brown Glacier
 * Brownleeite
 * Brownshill Dolmen
 * Broxton Rocks
 * Bruce C. Heezen
 * Bruce Erickson
 * Brunhes–Matuyama reversal
 * Brunonia Glacier
 * Brush Mountain (Blair County, Pennsylvania)
 * Brushy Butte
 * Brwynd Overthrust
 * Bryce Canyon National Park
 * Bryn-y-maen Fault
 * Bryn Eglwys Fault
 * Bryn Morgan Thrust
 * Bryn Posteg Fault
 * Brynderi Fault
 * Bryneglwys Fault
 * Bryngwili Fault
 * Bryngwyn Fault
 * Brøgger Glacier
 * Brú na Bóinne
 * Budden Canyon Formation
 * Buddingtonite
 * Bugle Rock
 * Bukovite
 * Bukovskyite
 * Bulger Geyser
 * Bull Lake glaciation
 * Bulletin of the American Meteorological Society
 * Bullhead Group
 * Bullockornis
 * Bumbanian
 * Bundaberg Hummock
 * Bungil Formation
 * Bunter (geology)
 * Buntsandstein
 * Burckle Crater
 * Burdigalian
 * Burgess Shale
 * Burgess Shale type fauna
 * Burgess Shale type preservation
 * Burgoon Formation
 * Burgstein (Thuringia)
 * Burgsvik beds
 * Burma Plate
 * Burn O'Vat
 * Burnetiidae
 * Bush Moa
 * Bushveld Igneous Complex
 * Bushveld Sandstone Formation
 * Buxton Glacier
 * Bwlchgwyn Fault
 * Byblos Fossil Museum
 * Bylchau Fault
 * Bystrite
 * Bytownite
 * Caballo Mountains
 * Cabonnichthys
 * Cache Creek Terrane
 * Cacholong
 * Cacops
 * Cacoxenite
 * Cactolith
 * Cadmoindite
 * Cadmoselite
 * Cadomian Orogeny
 * Cadomin Formation
 * Cae Parc Fault
 * Caenagnathasia
 * Caerdeon Bodlyn Fault
 * Caergwrle Fault
 * Caerleon Fault
 * Caerphilly Fault
 * Cahnite
 * Cainotherium
 * Caithness Flagstone Group
 * Calabozos
 * Calabrian (stage)
 * Calamitaceae
 * Calamites
 * Calamospondylus
 * Calaveras Fault
 * Calaverite
 * Calc-alkaline magma series
 * Calcaire de Caen
 * Calcaire de Valognes
 * Calcaire à Spatangues
 * Calcare di Aurisina
 * Calcarenite
 * Calcareous
 * Calcarintes du Jadet Formation
 * Calceolispongia
 * Calcflinta
 * Calcimicrobe
 * Calcite
 * Calcite sea
 * Calcium aluminates
 * Calcium carbonate
 * Caldera
 * Calderite
 * Caledonian orogeny
 * Caliche
 * California Earthquake Prediction Evaluation Council
 * Calizus de Lychnus Formation
 * Callovian
 * Callovosaurus
 * Calumetite
 * Calvin crater
 * Calymene niagarensis
 * Calymmian
 * Calypso Deep
 * Camadas de Montejunto
 * Camarillas Formation
 * Camas Formation
 * Cambrian
 * Cambrian explosion
 * Cambrian substrate revolution
 * Cambrian–Ordovician extinction event
 * Camdwr Fault
 * Camelops
 * Camelotia
 * Cameron's Line
 * Camlough Fault
 * Campanian
 * Campanorco
 * Campo del Cielo
 * Camposaurus
 * Campylocephalus
 * Campylodoniscus
 * Canadaga
 * Canadian Geophysical Union
 * Canadian Shield
 * Canadian Society of Petroleum Geologists
 * Canary Islands Quail
 * Canary hotspot
 * Canavesite
 * Cancrinite
 * Canfieldite
 * Cannel coal
 * Canobius
 * Canon del Colorado Formation
 * Cantabria (Mesozoic island)
 * Canyon
 * Canyon Diablo (meteorite)
 * Cap carbonate
 * Cape Fold Belt
 * Cape May diamonds
 * Cape Sebastian Sandstone
 * Capel Garmon Fault
 * Capillary fringe
 * Capitalsaurus
 * Capitanian
 * Caprock
 * Carancas impact event
 * Carbon capture and storage
 * Carbon fixation
 * Carbon flaw
 * Carbon sequestration
 * Carbonaceous chondrite
 * Carbonaceous film
 * Carbonate compensation depth
 * Carbonate minerals
 * Carboniferous
 * Carboniferous Rainforest Collapse
 * Carboniferous limestone
 * Carcinosoma
 * Cardiel Formation
 * Cardigan - Fishguard Fault Belt
 * Cardigan Pluton
 * Cardiocephalus
 * Cardium Formation
 * Caribbean Plate
 * Caribbean large igneous province
 * Carl August Stetefeldt
 * Carletonite
 * Carlile Formation
 * Carlin Unconformity
 * Carlin–type gold deposit
 * Carlsberg Ridge
 * Carmel Fault (Carmarthenshire)
 * Carmel Fault (Powys)
 * Carmel Head Thrust
 * Carnallite
 * Carnegie (ship)
 * Carnegie Ridge
 * Carnelian
 * Carnian
 * Carnlough Fault
 * Carnotaurinae
 * Carnotite
 * Carolina Bay
 * Caroline Birley
 * Carpathian Flysch Belt
 * Carpathite
 * Carpinteria Tar Pits
 * Carpolestes
 * Carpolestes simpsoni
 * Carreg Cennen Disturbance
 * Carrog Valley Fault
 * Carrollite
 * Carswell crater
 * Cascade Overthrust
 * Cascade Volcanoes
 * Casea
 * Caseasauria
 * Caseoides
 * Caseopsis
 * Caseosaurus
 * Casineria
 * Casselman Formation
 * Cassiar Terrane
 * Cassinoceras
 * Cassiterite
 * Castell Fault
 * Castillo Formation
 * Castlegate Sandstone
 * Cataclasite
 * Cataclastic rock
 * Catalina Schist
 * Catastrophism
 * Catenoleimus
 * Cathartesaura
 * Catopithecus
 * Catskill Formation
 * Cattierite
 * Caturrita Formation
 * Cavansite
 * Cave
 * Cave diving
 * Cave of Swallows
 * Cave popcorn
 * Caves of the Mendip Hills
 * Cayambe Coca Ecological Reserve
 * Caymanite
 * Cedar Mesa Sandstone
 * Cedarosaurus
 * Cefn-cerig Road
 * Cefn Bryn Thrust
 * Cefn Crib Fault
 * Cefn Fault
 * Cefn Garw Fault
 * Cefn Ila Fault
 * Cefnamwlch-Rhiw Fault
 * Ceibwr Bay Fault
 * Ceidio Fault
 * Celadonite
 * Celestine (mineral)
 * Celsian
 * Cement (geology)
 * Cenomanian
 * Cenomanian-Turonian boundary event
 * Cenozoic
 * Cenozoic Research Laboratory
 * Center for Meteorite Studies
 * Central America Volcanic Arc
 * Central American Seaway
 * Central Asian Orogenic Belt
 * Central Indian Ridge
 * Central Lapland Greenstone Belt
 * Centralian Superbasin
 * Centroberyx
 * Centrosaurinae
 * Cephalomyidae
 * Ceramornis
 * Ceratodus tiguidensis
 * Cerdocyon avius
 * Cerite
 * Cerrejón Formation
 * Cerro Azul (Chile volcano)
 * Cerro Barcino Formation
 * Cerro Carnerero Formation
 * Cerro Castillo Formation
 * Cerro Minchincha
 * Cerro del Pueblo Formation
 * Cervandonite
 * Cesanite
 * Cesbronite
 * Cetiosauriscus
 * Cetopangasius
 * Cetotherium
 * Ceunant Fault
 * Chabazite-Ca
 * Chaetocladus
 * Chaidamuite
 * Chalcanthite
 * Chalcedony
 * Chalcophyllite
 * Chalcopyrite
 * Chalk
 * Chalk Group
 * Chalk stream
 * Challenger Deep
 * Challenger Glacier
 * Challenger Plateau
 * Chambersite
 * Chamosite
 * Chandler Formation
 * Chandler wobble
 * Changbaiite
 * Changchengornis
 * Changdusaurus
 * Changhsingian
 * Channel pattern
 * Channel types
 * Chaoyangsauridae
 * Chapalmalania
 * Chapel Fault
 * Chapmanite
 * Characteristic earthquake
 * Charcot Plate
 * Chari Formation
 * Charles Alfred Matley
 * Charles Barrois
 * Charles C. Bradley
 * Charles Darwin
 * Charles David Curtis
 * Charles Francis Richter
 * Charles Hyde Warren
 * Charles Kenneth Leith
 * Charles Konig
 * Charles Lapworth
 * Charles Lory
 * Charles Lyell
 * Charles Rollin Keyes
 * Charles Schuchert
 * Charles Upham Shepard
 * Charles W. Gilmore
 * Charles Whittlesey (geologist)
 * Charles William Peach
 * Charlevoix Seismic Zone
 * Charlevoix crater
 * Charlie-Gibbs Fracture Zone
 * Charnia
 * Charnockite
 * Charnockite, St. Thomas Mount
 * Charonosaurus
 * Chasicoan
 * Chasmaporthetes
 * Chassigny (meteorite)
 * Chatham Penguin
 * Chatter mark
 * Chattian
 * Chattooga River
 * Chazy Formation
 * Chebsaurus
 * Cheiracanthus
 * Cheirolepis
 * Cheirothrix
 * Chelydrops
 * Chemical oceanography
 * Chemositia
 * Chemostratigraphy
 * Chenini Formation
 * Chepstow Fault
 * Chergach
 * Chernobylite
 * Chert
 * Chesapeake Bay impact crater
 * Cheshire Basin
 * Chester A. Arnold
 * Chesterite
 * Chestnut Ridge, Bedford County
 * Chevron (geology)
 * Chevron (land form)
 * Cheyenne belt
 * Chiastolite
 * Chichali Formation
 * Chickies Formation
 * Chickies Ridge
 * Chico Formation
 * Chicxulub crater
 * Chiemgau impact hypothesis
 * Chilantaisaurus
 * Chilcotin Group
 * Childrenite
 * Chile Rise
 * Chile Triple Junction
 * Chilecebus
 * Chilgog Formation
 * Chilhowee formation
 * Chilotherium
 * Chimera (paleontology)
 * China Geological Survey
 * China stone
 * Chinati Mountains
 * Chindesaurus
 * Chine
 * Chinese jade
 * Chiniquodontoidea
 * Chinle Formation
 * Chinlea
 * Chinshakiangosaurus
 * Chipola Formation
 * Chitarwata Formation
 * Chitinozoan
 * Chiyli crater
 * Chlorargyrite
 * Chlorastrolite
 * Chloritoid
 * Chondrite
 * Chondritic unfractionated reservoir
 * Chondrodite
 * Chondroplon
 * Chondrosteosaurus
 * Chonetes
 * Chonolith
 * Chorillo Formation
 * Chriacus
 * Chrisstanleyite
 * Christensen Glacier (South Georgia)
 * Christian Koeberl
 * Christian Leopold von Buch
 * Christite
 * Christmas Island Seamount Province
 * Christoph Gottfried Andreas Giebel
 * Christopher Hansteen
 * Christopher Packe (physician and cartographer)
 * Christopher Scotese
 * Christophersen Glacier
 * Chromite
 * Chromitite
 * Chroniosaurus
 * Chroniosuchus
 * Chronostratigraphy
 * Chronozone
 * Chrysoberyl
 * Chrysocolla
 * Chrysoprase
 * Chrysotile
 * Chuandongocoelurus
 * Chuanjie Formation
 * Chuanjiesaurus
 * Chubutherium
 * Chubutisaurus
 * Chuckanut Formation
 * Chugwater Formation
 * Chukcha crater
 * Chukchi Sea Shelf
 * Chungkingosaurus
 * Churchill craton
 * Cilfeigan Fault
 * Cimarron Ridge Formation
 * Cimmeria (continent)
 * Cimmerian Orogeny
 * Cimmerian Plate
 * Cimolesta
 * Cimolestes
 * Cimolichthys
 * Cimolopteryx
 * Cinder
 * Cinder cone
 * Cinizasaurus
 * Cinnabar
 * Cionodon
 * Circum-Superior Belt
 * Cirque glacier
 * Cistecephalus
 * Cistecephalus Assemblage Zone
 * Cisuralian
 * Clade
 * Cladoselache
 * Cladosictis
 * Claerwen Fault
 * Claggett Shale
 * Clarence Fault
 * Clarence Moreton Basin
 * Clark Quarry
 * Clarkeite
 * Clarkia fossil beds
 * Clasmodosaurus
 * Classification of minerals – Non silicates
 * Classification of minerals – Silicates
 * Clastic dike
 * Clastic rock
 * Clastic wedge
 * Clausthalite
 * Clavilithes
 * Clay
 * Clay earth pigment
 * Clay minerals
 * Claypan
 * Clayton-Marsh Creek-Greenville Fault
 * Clayton Glacier
 * Clearwater Formation
 * Clearwater Lakes
 * Cleavage (geology)
 * Clement Reid
 * Clepsydrops
 * Cleveite
 * Cliff
 * Cliff-former
 * Cliff-top dune
 * Climacoceras
 * Climacoceratidae
 * Climactichnites
 * Climate change
 * Climate change and poverty
 * Climate change feedback
 * Climatiiformes
 * Climatius
 * Clinohumite
 * Clinoptilolite
 * Clinopyroxene thermobarometry
 * Clinozoisite
 * Clinton Group
 * Clintonite
 * Clive Forster Cooper
 * Clogher Valley Fault
 * Closure temperature
 * Cloud Creek crater
 * Cloudinid
 * Cloverly Formation
 * Club (anatomy)
 * Clutch (eggs)
 * Clwyd Fault
 * Clydach Bridge Fault
 * Clywedog Fault
 * Coal
 * Coal ball
 * Coal forest
 * Coal measures
 * Coalbrook Fault
 * Coast Range Arc
 * Coast Range Geomorphic Province
 * Coastal Volcanic Belt
 * Cobaltite
 * Cobb hotspot
 * Cobble (geology)
 * Cobelodus
 * Cobequid fault
 * Coccinite
 * Coccolithophore
 * Coccosteus
 * Cochleosaurus
 * Cockercombe tuff
 * Coconinoite
 * Cocos Plate
 * Codball
 * Cody Scarp
 * Cody Shale
 * Coed-y-paen Fault
 * Coed Hir Fault
 * Coed Ithel Fault
 * Coelophysidae
 * Coelopleurus
 * Coeluridae
 * Coeluroides
 * Coesite
 * Coffinite
 * Cohenite
 * Cokedale Formation
 * Colalura Sandstone
 * Cold seep
 * Coldwell Complex
 * Colepiocephale
 * Colhuehuapian
 * Coli Toro Formation
 * Collision zone
 * Colluvium filled bedrock hollow
 * Coloradisaurus
 * Colorado Group
 * Colorado orogeny
 * Coltan
 * Columbia (supercontinent)
 * Columbite
 * Columbus Limestone
 * Comanchesaurus
 * Comley limestone
 * Common surface features of Mars
 * Compaction (geology)
 * Compatibility (geochemistry)
 * Competence (geology)
 * Complex crater
 * Complex volcano
 * Compression (geology)
 * Compression fossil
 * Compsosuchus
 * Compton Glacier
 * Compton Martin Ochre Mine
 * Conasauga shale
 * Conchoraptor
 * Concretion
 * Condorraptor
 * Condurrite
 * Cone-in-cone structures
 * Conglomerados de Caranguejeira
 * Conglomerate (geology)
 * Congo craton
 * Congorhynchus
 * Coniacian
 * Conichalcite
 * Coniornis
 * Coniston Limestone
 * Connecticut River Valley trackways
 * Connolly Basin crater
 * Conococheague Formation
 * Conoscopic interference pattern
 * Conoscopy
 * Conrad discontinuity
 * Continent
 * Continent-ocean boundary
 * Continental Ranges
 * Continental collision
 * Continental crust
 * Continental drift
 * Continental fragment
 * Continental rise
 * Continental shelf
 * Contourite
 * Conulariids
 * Conulus
 * Convergent boundary
 * Convergent evolution
 * Conway Formation
 * Conway granite
 * Cooksonia
 * Cool early Earth
 * Cool tropics paradox
 * Coon Creek Formation
 * Cooper Canyon Formation
 * Cooperite
 * Coordinating Committee for Earthquake Prediction
 * Coosawhatchie Formation
 * Cooyoo
 * Copaline
 * Cope's rule
 * Copepteryx
 * Copernican period
 * Copiapite
 * Copper Works Fault
 * Copper mining in the United States
 * Coppermine River Group
 * Coquina
 * Corallian Limestone
 * Corallian Oolite Formation
 * Coralline rock
 * Cordierite
 * Cordillera
 * Cordillera Occidental
 * Cordilleran Ice Sheet
 * Core sample
 * Coreena Formation
 * Core–mantle boundary
 * Corkite
 * Cornbrash
 * Cornbrash Formation
 * Cornuata
 * Cornubian batholith
 * Corral de Enmedio Formation
 * Corrasion
 * Correlation of Stratigraphic Units of North America
 * Cors-bol Fault
 * Corton Formation
 * Corundum
 * Corycian Cave
 * Coryphodon
 * Cosmogenic radionuclide dating
 * Coso Hot Springs
 * Cosoryx
 * Costean
 * Cotswold Slate
 * Cotswold stone
 * Cotta Sandstone
 * Coulee
 * Couloir
 * Country rock (geology)
 * Coupatezia
 * Couture crater
 * Cox's Cave
 * Coyoteite
 * Crack in the Ground
 * Crag and tail
 * Craie Chloritee
 * Craie tufau
 * Craig-y-beri Fault
 * Craig-y-glyn Fault
 * Craig Twrch Fault
 * Craignant - Milton Fault
 * Craignant Fault
 * Cramauchenia
 * Cranioceras
 * Craspedodon
 * Crater Glacier
 * Crater Lake
 * Craterosaurus
 * Craton
 * Cratonic sequence
 * Crawford crater
 * Creation–evolution controversy
 * Creedite
 * Creigydd Fault
 * Crenaticaulis
 * Crenulation
 * Crest (hydrology)
 * Cretaceous
 * Cretaceous Long Normal
 * Cretaceous Mongolia
 * Cretaceous Thermal Maximum
 * Cretaceous–Paleogene extinction event
 * Cretan Dwarf Megacerine
 * Cretoperipatus burmiticus
 * Cretoxyrhinidae
 * Crevasse Canyon Formation
 * Cribarth Disturbance
 * Crichtonsaurus
 * Crick Fault
 * Cristatusaurus
 * Critical taper
 * Cro-Magnon 1
 * Crocoite
 * Cromer Forest Bed
 * Cromer Ridge
 * Cronstedtite
 * Crooked Creek crater
 * Crookesite
 * Cross-bedding
 * Cross-cutting relationships
 * Cross-plot
 * Cross Ash Fault
 * Crossite
 * Crowfoot Formation
 * Crowsnest Formation
 * Crusafontia
 * Crushed stone
 * Crust (geology)
 * Crustal recycling
 * Cruziana
 * Crychan Fault
 * Crychan Fault Belt
 * Cryogenian
 * Cryolite
 * Cryptic era
 * Cryptocrystalline
 * Cryptodome
 * Cryptoexplosion
 * Cryptoraptor
 * Cryptosaurus
 * Crystal Cave (Ohio)
 * Crystal Cave (Pennsylvania)
 * Crystal cluster
 * Crystal habit
 * Crystal system
 * Crystallography
 * Csehbánya Formation
 * Ctenaspis
 * Ctenopristis
 * Ctenopterus
 * Ctenorhabdotus
 * Ctenorhachis
 * Ctenospondylus
 * Ctenurella
 * Cubanite
 * Cuesta
 * Cueva del Fantasma
 * Cueva del Viento
 * Culm Measures
 * Cumberland Plateau
 * Cumberlandite
 * Cummingtonite
 * Cumulate rock
 * Cupalite
 * Cupressocrinites
 * Cuprosklodowskite
 * Cuprospinel
 * Curite
 * Current sea level rise
 * Cuspate foreland
 * Cuspirostrisornis
 * Cut bank
 * Cutinite
 * Cuvieronius
 * Cwm-Mawr Fault
 * Cwm-dows Fault
 * Cwm Cayo Brook Fault
 * Cwm Cynnen Fault
 * Cwm Dockin Fault
 * Cwm Dwfnant Fault
 * Cwm Earl Fault
 * Cwm Felin Fault
 * Cwm Llwyd Fault
 * Cwm Pennant Fault
 * Cwm Pit Fault
 * Cwm Sylwi Fault
 * Cwmcarvan Fault
 * Cwmgwineu Fault
 * Cwmllynfell Fault
 * Cwmmawr Thrust
 * Cwmneol Fault
 * Cyanotrichite
 * Cyathocrinites
 * Cycladic Massif
 * Cycle of erosion
 * Cyclic salt
 * Cyclic sediments
 * Cyclomedusa
 * Cyclostratigraphy
 * Cyclothems
 * Cyclothyris
 * Cyclotosaurus
 * Cygnus falconeri
 * Cylindrite
 * Cylindroteuthis
 * Cymmer Fault
 * Cymrite
 * Cynarctus
 * Cynheidre Thrust
 * Cynllaith Fault
 * Cynodesmus
 * Cynodictis
 * Cynognathus Assemblage Zone
 * Cyonasua
 * Cypress Hills Formation
 * Cyprus arc
 * Cyranichthys
 * Cyrilovite
 * D"
 * Daanosaurus
 * Dabrazinskaya Svita
 * Dachongosaurus
 * Dacite
 * Daedalus (trace fossil)
 * Daeodon
 * Dahkla Formation
 * Dai Hung oilfield
 * Dakota Sandstone
 * Dakotadon
 * Dalangshan Formation
 * Dale Russell
 * Dalgaranga crater
 * Dalianraptor
 * Dallasite
 * Dalpiazia
 * Dalradian
 * Damalasaurus
 * Damp (mining)
 * Dan McKenzie (geophysicist)
 * Danburite
 * Dandakosaurus
 * Danian
 * Daniel Barringer (geologist)
 * Daniel Sigman
 * Daohugou Beds
 * Daphne Island
 * Daphoenus
 * Dapingfangornis
 * Dapuka Group
 * Daril Formation
 * Darriwilian
 * Dartmoor kistvaens
 * Dartmuthia
 * Darwin Crater
 * Darwin Island
 * Darwin Rise
 * Darwin glass
 * Dashanpusaurus
 * Dashuigou Formation
 * Dasypus bellus
 * Davelis Cave
 * David A. Johnston
 * David B. Norman
 * David Dale Owen
 * David Forbes (mineralogist)
 * David P. Penhallow
 * David Williams (geologist)
 * Davidite
 * Daye Group
 * Deacock Glacier
 * Dead-ice
 * Dead Clade Walking
 * Dead End Glacier
 * Dead Sea Rift
 * Deadwater (topography)
 * Debolt Formation
 * Debris flow
 * Decaturville crater
 * Decorah Shale
 * Deep-ocean Assessment and Reporting of Tsunamis
 * Deep Bay crater
 * Deep Sea Drilling Program
 * Deep focus earthquake
 * Deep time
 * Deep well drilling
 * Deformation mechanism
 * Degradation (geology)
 * Deinogalerix
 * Delamination (geology)
 * Delaware Geological Survey
 * Delaware Water Gap
 * Delhi, Qinghai
 * Delitzschala
 * Dellen
 * Dells of the Wisconsin River
 * Delphyodontos
 * Delta switching
 * Deltadromeus
 * Deltatheridium
 * Deltoblastus
 * Deltoptychius
 * Delvauxite
 * Demantoid
 * Demesmaekerite
 * Demoiselles Coiffées de Pontis
 * Demopolis Chalk Formation
 * Denali Fault
 * Denderpeton
 * Dendrerpeton
 * Dendrochronology
 * Dense non-aqueous phase liquid
 * Densus Ciula Formation
 * Dents de Lanfon
 * Denver Basin
 * Deposition (geology)
 * Depression (geology)
 * Depth conversion
 * Depth hoar
 * Depth–slope product
 * Dercetis
 * Dercetoides
 * Derived fossil
 * Derriksite
 * Des Plaines crater
 * Deseadan
 * Desert
 * Desert pavement
 * Desmatophoca
 * Desmostylus
 * Detachment fault
 * Detritus (geology)
 * Detroit Seamount
 * Deutsches Geodätisches Forschungsinstitut
 * Devil's Backbone (rock formation)
 * Devil's Jumps, Churt
 * Devil's Rock
 * Devilline
 * Devils Hole
 * Devonian
 * Dharwar craton
 * Diabasbrottet quarry
 * Diabase
 * Diabolepis
 * Diacalymene
 * Diachronous
 * Diacodexis
 * Diadiaphorus
 * Diadochite
 * Diagenesis
 * Diamictite
 * Diamicton
 * Diapir
 * Diarthrognathus
 * Diastrophism
 * Diatom
 * Diatomaceous earth
 * Diatreme
 * Dicellopyge
 * Dichobunidae
 * Dickinsoniidae
 * Diclonius
 * Dicoelosia
 * Dicranurus
 * Dicrocerus
 * Dictyothyris
 * Dicynodon Assemblage Zone
 * Didazoonidae
 * Didolodus
 * Differential stress
 * Digenite
 * Digital geologic mapping
 * Digital outcrop models
 * Dike (geology)
 * Dike swarm
 * Diluvium
 * Dim spot
 * Dimerocrinites
 * Dimylus
 * Dinaelurus
 * Dinantian
 * Dinictis
 * Dinocaridida
 * Dinocochlea
 * Dinodocus
 * Dinofelis
 * Dinogorgon
 * Dinohippus
 * Dinosaur Isle
 * Dinosaur Park (Prince George's County, Maryland)
 * Dinosaur Park Formation
 * Dinosaur Ridge
 * Diogenite
 * Diogenornis
 * Dioptase
 * Diorite
 * Dip circle
 * Diplichnites
 * Diplocaulidae
 * Diplocaulus
 * Diploceraspis
 * Diplocraterion
 * Diplotomodon
 * Diplovertebron
 * Dipnorhynchus
 * Dipterus
 * Dirt cone
 * Discharge (hydrology)
 * Discinisca
 * Discontinuity (geotechnical engineering)
 * Discosauriscidae
 * Discosauriscus
 * Discrete element method
 * Dissacus
 * Dissected plateau
 * Dissolved load
 * Dissopsalis
 * Distributary
 * Disturbance (geology)
 * Divergent boundary
 * Djadochta Formation
 * Doahuqou Formation
 * Doane Rock
 * Dob's Linn
 * Dobele crater
 * Dockum Group
 * Docodon
 * Docodonta
 * Doedicurus
 * Doggerland
 * Dohoin Usa Formation
 * Doig Formation
 * Doleorthis
 * Dolerite
 * Dolichocebus
 * Dolichosuchus
 * Dolichuranus
 * Doliosauriscus
 * Dollaseite-(Ce)
 * Dolomite
 * Dolomitization
 * Dolores River Canyon
 * Dolostone
 * Dome (geology)
 * Domeykosaurus
 * Don L. Anderson
 * Don Lessem
 * Donald Canfield
 * Dongbeititan
 * Donnybrook stone
 * Donoho Creek Formation
 * Doryaspis
 * Double terminated crystal
 * Doublet earthquake
 * Douglas Emlong
 * Douglas Erwin
 * Douiret Formation
 * Doushantuo Formation
 * Downes Glacier
 * Draconyx
 * Drainage basin
 * Drainage divide
 * Drefach Group
 * Dreikanter
 * Drepanaspis gemuendenensis
 * Drepanopterus
 * Dresbachian
 * Drift (geology)
 * Drift mining
 * Driftless Area
 * Drimys (fish)
 * Dromaeosauroides
 * Dromasauria
 * Dromiceiomimus
 * Dromornis australis
 * Dromornis stirtoni
 * Dropstone
 * Drummer (soil)
 * Drummond Matthews
 * Druse (geology)
 * Dry quicksand
 * Dryptosauridae
 * Dryptosauroides
 * Dryrock
 * Drysdallite
 * Dubreuillosaurus
 * Ductility (Earth science)
 * Duftite
 * Dukamaje Formation
 * Duluth Complex
 * Dundasite
 * Dune
 * Dunham classification
 * Dunite
 * Dunkard Group
 * Dunvegan Formation
 * Dunyazad (crater)
 * Duria Antiquior
 * Duricrust
 * Dutch Creek Hoodoos
 * Duvernay Formation
 * Dvinosauria
 * Dwyka
 * Dwyka Group
 * Dynamic quartz recrystallization
 * Dynamic topography
 * Dyoplosaurus
 * Dyscrasite
 * Dysganus
 * Dyslocosaurus
 * Dystrophaeus
 * Dzhalindite
 * Décollement
 * ECLIPSE (reservoir simulator)
 * ETH Laboratory of Ion Beam Physics
 * Eagle Butte crater
 * Eagle Ford Formation
 * Eagle Sandstone
 * Ealey Glacier
 * Early Cambrian
 * Early Cambrian geochemical fluctuations
 * Early Cretaceous
 * Early Devonian
 * Early Earth
 * Early Imbrian
 * Early Jurassic
 * Early Mississippian
 * Early Ordovician
 * Early Pennsylvanian
 * Early Pleistocene
 * Early Triassic
 * Earth
 * Earth's magnetic field
 * Earth's orbit
 * Earth's rotation
 * Earth's spheres
 * Earth Impact Database
 * Earth Interactions
 * Earth Surface Processes and Landforms
 * Earth mass
 * Earth materials
 * Earth physical characteristics tables
 * Earth science
 * Earth tide
 * Earthflow
 * Earthquake
 * Earthquake swarm
 * Earthquake warning system
 * Earthquakes in Japan
 * Earthscope
 * East African Rift
 * East Antarctic craton
 * East Australia hotspot
 * East European craton
 * East Pacific Rise
 * Eastend Formation
 * Easter Plate
 * Easter hotspot
 * Eastern Mediterranean event
 * Eastern North America Rift Basins
 * Eastwater Cavern
 * Ecca Group
 * Echinocorys
 * Echinodon
 * Echinognathus
 * Eclipse Glacier
 * Eclogite
 * Economic geology
 * Ectasian
 * Ecteninion
 * Ectocion
 * Ectoconus
 * Edaphosauridae
 * Eday Group
 * Edenite
 * Edestus
 * Ediacara biota
 * Ediacaran
 * Ediacaria
 * Edinburgh Geological Society
 * Edmond Halley
 * Edmonton Group
 * Edops
 * Edough massif
 * Eduction (geology)
 * Edward A. Irving
 * Edward Budge
 * Edward Howel Francis
 * Edward W. Berry
 * Edwin Harris Colbert
 * Eemian
 * Eemian sea
 * Effusive eruption
 * Efraasia
 * Efremovite
 * Eginsai Svita
 * Eh (geology)
 * Eifel hotspot
 * Eifelian
 * Eilat stone
 * Ejinhoro Formation
 * Ekaltadeta
 * Ekanite
 * Ekrixinatosaurus
 * El Collado Formation
 * El Picacho Formation
 * El Tranquilo Formation
 * Elagh Fault
 * Elaphrosaurus
 * Elbe Sandstone
 * Elbogen (meteorite)
 * Elbow crater
 * Eldorado Valley
 * Electrical resistance survey (archaeology)
 * Electrical resistivity tomography
 * Electrode array
 * Elephas namadicus
 * Elephas recki
 * Elgygytgyn Lake
 * Elizabeth Carne
 * Elk Basin
 * Elk Point Group
 * Elkanah Billings
 * Ellerslie Member
 * Ellesmere Island Volcanics
 * Elliot Formation
 * Ellis Group
 * Elm Coulee Oil Field
 * Elmer S. Riggs
 * Elmisaurus
 * Elomeryx
 * Elsinore Fault Zone
 * Elso Sterrenberg Barghoorn
 * Elsornis
 * Eluvium
 * Elvan
 * Emanuel Bunzel
 * Emausaurus
 * Embasaurus
 * Embolomeri
 * Embrithopoda
 * Emeishan Traps
 * Emerald
 * Emery (mineral)
 * Emil Wiechert
 * Emirian
 * Emmonsite
 * Empressite
 * Emsian
 * Emydops
 * En echelon veins
 * Enaliarctos
 * Enaliarctos emlongi
 * Enaliornis
 * Enantiornis
 * Enchodus
 * Encisco Group
 * End-Botomian mass extinction
 * End-Ediacaran extinction
 * Enderbite
 * Endocranial cast
 * Endorheic basin
 * Endothiodon
 * Engineering geology
 * Enhanced geothermal system
 * Enhydrocyon
 * Enigmosaurus
 * Enon Formation
 * Enrichment factor
 * Enriquillo–Plantain Garden fault zone
 * Ensenadan
 * Ensisheim (meteorite)
 * Enstatite
 * Enstatite chondrite
 * Entrenched river
 * Environmental and Engineering Geophysical Society
 * Environmental geology
 * Environmental magnetism
 * Eoalulavis
 * Eoarchean
 * Eobasileus
 * Eobothus
 * Eobrontosaurus
 * Eocaecilia
 * Eocarcharia
 * Eocardia
 * Eocathayornis
 * Eocene
 * Eocene–Oligocene extinction event
 * Eoconfuciusornis
 * Eocrinoid
 * Eodicynodon
 * Eodicynodon Assemblage Zone
 * Eoenantiornis
 * Eogyrinidae
 * Eogyrinus
 * Eolambia
 * Eolith
 * Eomanis
 * Eomoropidae
 * Eomys
 * Eon (geology)
 * Eonothem
 * Eophyllophyton
 * Eos (journal)
 * Eospirifer
 * Eotebenna
 * Eotheroides
 * Eothyris
 * Eotitanops
 * Eozoon canadense
 * Eozostrodon
 * Epachthosaurus
 * Epanterias
 * Eparchaean Unconformity
 * Epeiric sea
 * Epeirogenic movement
 * Epicenter
 * Epidosite
 * Epidote
 * Episodes (journal)
 * Epoccipital
 * Eporeodon
 * Equatorial ridge
 * Era (geology)
 * Erathem
 * Eratosthenian
 * Eremotherium
 * Erettopterus
 * Ergilian
 * Erich Maren Schlaikjer
 * Ericiolacerta
 * Ericssonite
 * Eridanos (geology)
 * Erik Jarvik
 * Eriptychiida
 * Erliansaurus
 * Erlikosaurus
 * Erling Dorf
 * Ernanodon
 * Ernietta
 * Eromanga Basin
 * Erosion
 * Erosion and tectonics
 * Erquitaia
 * Eruption column
 * Erwin Hinckly Barbour
 * Erygmascope
 * Eryon
 * Eryosuchus
 * Erythrite
 * Erythrotherium
 * Es Skhul
 * Escarpment
 * Escarpment Grit
 * Escucha Formation
 * Eshanosaurus
 * Esker
 * Esperite
 * Essonodon
 * Estavelle
 * Estuary
 * Ettringite
 * Eucercosaurus
 * Euchambersia
 * Euchroite
 * Eucladoceros
 * Euclase
 * Eucrite
 * Eudialyte
 * Eudialyte group
 * Euenantiornithes
 * Euhelopodidae
 * Euhelopus
 * Eumegamys
 * Eumeralla Formation
 * Eumorphocorystes
 * Euphoberia
 * Euramerica
 * Eurasian Plate
 * Eurhinodelphinidae
 * Eurhinodelphis
 * Eurolimnornis
 * Euronychodon
 * European Cenozoic Rift System
 * European Geosciences Union
 * Eurotamandua
 * Eurotrochilus
 * Euryapteryx
 * Eurypholis
 * Eurypterus remipes
 * Euryzygoma
 * Euskelosaurus
 * Eusmilus
 * Eutaw Formation
 * Eutherocephalia
 * Euxine abyssal plain
 * Evanston Formation
 * Evaporite
 * Eveite
 * Everglades
 * Evermanella
 * Evgeny Maleev
 * Evolution of dinosaurs
 * Evolution of fungi
 * Evolutionary history of plants
 * Evolutionary radiation
 * Ewing Seamount
 * Exaeretodon
 * Exfoliation joint
 * Exhumed river channel
 * Exner equation
 * Exocoetoides
 * Exotic terrane
 * Expansive clay
 * Exploration geophysics
 * Explorer Plate
 * Explorer Ridge
 * Explorornis
 * Exshaw Formation
 * Extensional fault
 * Extensional tectonics
 * Extinct volcano
 * Extinction angle
 * Extinction event
 * Extraterrestrial materials
 * Extrusive
 * FEFLOW
 * Fabric (geology)
 * Fabrosauridae
 * Fabrosaurus
 * Facies
 * Fahlband
 * Fairy Cave Quarry
 * Falcatus falcatus
 * Fall River granite
 * Fall line
 * Famennian
 * Farak Formation
 * Farallon Plate
 * Farallon Trench
 * Farewell Rock
 * Fasciculus
 * Fassaite
 * Fault-block
 * Fault (geology)
 * Fault block
 * Fault breccia
 * Fault gouge
 * Fault scarp
 * Fault trace
 * Favret Formation
 * Fayalite
 * February 4, 1998 Afghanistan earthquake
 * Fech fech
 * Feldspar
 * Feldspathoid
 * Felix Andries Vening Meinesz
 * Felsenmeer
 * Felsic
 * Feltville Formation
 * Fen Complex, Norway
 * Fengjiahe Formation
 * Ferberite
 * Ferdinand Stoliczka
 * Ferdinand Zirkel
 * Ferganasaurus
 * Ferganocephale
 * Fergusonite
 * Fern spike
 * Fernie Formation
 * Feroxyhyte
 * Ferrallitisation
 * Ferrihydrite
 * Ferropericlase
 * Ferroselite
 * Festningen Geotope Protected Area
 * Fettelite
 * Feuerletten Formation
 * Fezouata formation
 * Fiamme
 * Fichtelgebirge
 * Ficopsis
 * Fifth planet (hypothetical)
 * Fiftyone Glacier
 * Figure of the Earth
 * Firedamp
 * First appearance datum
 * First break picking
 * Fish Canyon tuff
 * Fisk Holbrook Day
 * Fissility (geology)
 * Fission track dating
 * Fjord
 * Fjords of the United States
 * Flame structure
 * Flaming Cliffs
 * Flandrian interglacial
 * Flaser bed
 * Flashline Mars Arctic Research Station
 * Flat-slab subduction
 * Flat spot (reflection seismology)
 * Flatwood
 * Flaxman crater
 * Fleming Fjord Formation
 * Flin Flon greenstone belt
 * Flint
 * Flood basalt
 * Flood geology
 * Florence Bascom
 * Florentino Ameghino
 * Florida Caverns State Park
 * Floridan Aquifer
 * Flow banding
 * Flowstone
 * Fluckite
 * Fluid inclusions
 * Fluoborite
 * Fluocerite
 * Fluor-liddicoatite
 * Fluor-uvite
 * Fluorcaphite
 * Fluorite
 * Fluororichterite
 * Fluting (geology)
 * Fluvial
 * Fluvial landforms of streams
 * Flynn Creek crater
 * Flysch
 * Fodinichnia
 * Foelsche crater
 * Foiba
 * Foidolite
 * Fold (geology)
 * Fold and thrust belt
 * Fold mountain
 * Foliation (geology)
 * Folk classification
 * Foraminiferal Colouration Index
 * Forcall Formation
 * Forearc
 * Forebulge
 * Foreknobs Formation
 * Foreland basin
 * Forensic geology
 * Forensic seismology
 * Foreset bed
 * Foreshock
 * Forest Sandstone Formation
 * Forfexicaris
 * Form classification
 * Formation (stratigraphy)
 * Forsterite
 * Fort Crittenden Formation
 * Fort Payne Formation
 * Fort Simpson Formation
 * Fort St. John Group
 * Fort Union Formation
 * Fossa (geology)
 * Fossil
 * Fossil Detectives
 * Fossil Parks of India
 * Fossil collecting code
 * Fossil fuel
 * Fossil trackway
 * Fossil water
 * Fossils of the Burgess Shale
 * Fougerite
 * Fountain Formation
 * Fountain Paint Pot
 * Fox Hills Formation
 * Fractional crystallization (geology)
 * Fracture (geology)
 * Fracture zone
 * Fraipontite
 * Fram Formation
 * Francevillite
 * Francis Arthur Bather
 * Francis Birch (geophysicist)
 * Francis J. Pettijohn
 * Franciscan Assemblage
 * Franckeite
 * Frankamenite
 * Frankdicksonite
 * Franklinite
 * Franz Ritter von Hauer
 * Franz Xaver Zippe
 * Fraser Filter
 * Frasnian
 * Frederick Augustus Genth
 * Frederick C. Finkle
 * Frederick Drew
 * Frederick Haynes Newell
 * Frederick Schram
 * Frederick Vine
 * Free-air gravity anomaly
 * Freibergite
 * Freieslebenite
 * Fremouw Formation
 * Frenchman Formation
 * Freshwater marsh
 * Friedrich Johann Karl Becke
 * Friedrich von Huene
 * Frontenac Axis
 * Frontier Formation
 * Froschfelsen
 * Frost creep
 * Frost line
 * Frostwork
 * Fruchtschiefer
 * Fruitland Formation
 * Fröjel formation
 * Fubarite
 * Fucauma Diamond Mine
 * Fuente de los Azulejos
 * Fukuchilite
 * Fukuiraptor
 * Fukuisaurus
 * Fulengia
 * Fulgurotherium
 * Fumarole
 * Furong Cave
 * Furongian
 * Fusakichi Omori
 * Fusuisaurus
 * Futaba Group
 * Future of the Earth
 * G. K. Warren Prize
 * GB Cave
 * Gabbro
 * Gabrielite
 * Gadolinite
 * Gahnite
 * Gakkel Ridge
 * Galapagos Microplate
 * Galapagos Rise
 * Galapagos Triple Junction
 * Galaxite
 * Galechirus
 * Galena Group
 * Galesauridae
 * Galesaurus
 * Galilee (ship)
 * Galkhaite
 * Gallinuloides
 * Galmoy Mine
 * Galápagos hotspot
 * Gananite
 * Gandakasia
 * Gangamopteris
 * Ganister
 * Ganopristis
 * Gansus
 * Gardner's relation
 * Gardnos crater
 * Gargantuavis
 * Garibaldi Volcanic Belt
 * Garita Creek Formation
 * Garlock Fault
 * Garnet
 * Garnierite
 * Garniss Curtis
 * Gary Roskin
 * Gasparinisaura
 * Gasteroclupea
 * Gatun structure
 * Gauja Formation
 * Gault
 * Gauss-Matuyama reversal
 * Gawler craton
 * Gazzi-Dickinson method
 * Gediminas Motuza
 * Geerite
 * Geigerite
 * Gelasian
 * Gelifluction
 * Gellért Hill Cave
 * Gemology
 * Gemstone
 * Genusaurus
 * GeoArabia
 * GeoRef
 * GeoRef bibliographic database
 * GeoRef database
 * GeoSciML
 * Geoarchaeology
 * Geobase
 * Geobiology
 * Geochemical Society
 * Geochemistry
 * Geochimica et Cosmochimica Acta
 * Geochronology
 * Geochronometry
 * Geocoma
 * Geode
 * Geodesy
 * Geodiversity
 * Geodynamics
 * Geoffrey Hattersley-Smith
 * Geoforecasting
 * Geogony
 * Geohazard
 * Geoid
 * Geoinformatics
 * Geologic hazards
 * Geologic map
 * Geologic preliminary investigation
 * Geologic province
 * Geologic record
 * Geologic temperature record
 * Geologic time scale
 * Geologic timeline of Western North America
 * Geological Commission of the Cape of Good Hope
 * Geological Conservation Review
 * Geological Exploration of the Fortieth Parallel
 * Geological Magazine
 * Geological Society of America
 * Geological Society of India
 * Geological Society of London
 * Geological Society of South Africa
 * Geological Society of Washington
 * Geological Strength Index
 * Geological Survey of Canada
 * Geological Survey of Newfoundland and Labrador
 * Geological and geophysical engineering
 * Geological history
 * Geological history of Earth
 * Geological history of Europe
 * Geological history of Mars
 * Geological history of Point Lobos
 * Geological resistance
 * Geological structure of Great Britain
 * Geological survey
 * Geological unit
 * Geologist
 * Geologist's hammer
 * Geologists' Association
 * Geologists Day
 * Geology
 * Geology (journal)
 * Geology Today
 * Geology of Alabama
 * Geology of Alderley Edge
 * Geology of Alderney
 * Geology of Andorra
 * Geology of Antarctica
 * Geology of Australia
 * Geology of Bedford County, Pennsylvania
 * Geology of Bolivia
 * Geology of British Columbia
 * Geology of Chad
 * Geology of Cheshire
 * Geology of Chile
 * Geology of China
 * Geology of Colombia
 * Geology of Connecticut
 * Geology of Cornwall
 * Geology of Delaware
 * Geology of Dorset
 * Geology of East Sussex
 * Geology of England
 * Geology of Europe
 * Geology of Florida
 * Geology of Fujian
 * Geology of Georgia (U.S. state)
 * Geology of Gloucestershire
 * Geology of Gotland
 * Geology of Great Britain
 * Geology of Greenland
 * Geology of Guernsey
 * Geology of Hampshire
 * Geology of Hertfordshire
 * Geology of Iceland
 * Geology of Idaho
 * Geology of Illinois
 * Geology of India
 * Geology of Iowa
 * Geology of Japan
 * Geology of Jersey
 * Geology of Kansas
 * Geology of London
 * Geology of Mars
 * Geology of Massachusetts
 * Geology of Mercury
 * Geology of Minnesota
 * Geology of Nauru
 * Geology of Nepal
 * Geology of New England
 * Geology of New Jersey
 * Geology of New South Wales
 * Geology of North America
 * Geology of Norway
 * Geology of Oklahoma
 * Geology of Orkney
 * Geology of Pakistan
 * Geology of Pennsylvania
 * Geology of Queensland
 * Geology of Saskatchewan
 * Geology of Scotland
 * Geology of Shropshire
 * Geology of Singapore
 * Geology of Somerset
 * Geology of Taiwan
 * Geology of Tasmania
 * Geology of Tennessee
 * Geology of Texas
 * Geology of Turkey
 * Geology of Uruguay
 * Geology of Venus
 * Geology of Wales
 * Geology of West Virginia
 * Geology of solar terrestrial planets
 * Geology of the Alps
 * Geology of the Antarctic Peninsula
 * Geology of the Appalachians
 * Geology of the Auckland Region
 * Geology of the Australian Capital Territory
 * Geology of the Bryce Canyon area
 * Geology of the Capitol Reef area
 * Geology of the Death Valley area
 * Geology of the English counties
 * Geology of the Faroe Islands
 * Geology of the Grand Canyon area
 * Geology of the Grand Teton area
 * Geology of the Himalaya
 * Geology of the Iberian Peninsula
 * Geology of the Lassen volcanic area
 * Geology of the Moon
 * Geology of the Netherlands
 * Geology of the North Sea
 * Geology of the Northland Region
 * Geology of the Pacific Northwest
 * Geology of the Philippines
 * Geology of the Pyrenees
 * Geology of the Taranaki Region
 * Geology of the Waikato-King Country Region
 * Geology of the Wellington Region
 * Geology of the Western Carpathians
 * Geology of the Yosemite area
 * Geology of the Zion and Kolob canyons area
 * Geomagnetic excursion
 * Geomagnetic jerk
 * Geomagnetic pole
 * Geomagnetic reversal
 * Geomagnetic secular variation
 * Geomathematics
 * Geomechanics
 * Geomicrobiology
 * Geomorphology
 * Geomythology
 * Geon (geology)
 * Geophysical Journal International
 * Geophysical Research Letters
 * Geophysical Survey of Canada
 * Geophysical fluid dynamics
 * Geophysical global cooling
 * Geophysical survey
 * Geophysics
 * Geophysiology
 * Georg August Goldfuss
 * Georg Hartmann
 * Georg zu Münster
 * George Barrow (geologist)
 * George Edward Backus
 * George Graham (clockmaker)
 * George Perkins Merrill
 * George Wetherill
 * Georgia Depression
 * Georgia Marble Company
 * Georgiaite
 * Georgina Basin
 * Georgius Agricola
 * Geosphere
 * Geostatistics
 * Geostrophic current
 * Geosyncline
 * Geotechnical engineering
 * Geotechnics
 * Geothermal areas of Yellowstone
 * Geothermal electricity
 * Geothermal energy
 * Geothermal gradient
 * Geothermobarometry
 * Gephyrostegus
 * Geranopterus
 * Geranosaurus
 * Gerhard vom Rath
 * Gerhartsreiter Schichten
 * Germanite
 * Gerrothorax
 * Geschiebekunde
 * Getchellite
 * Gething Formation
 * Geyser
 * Geyserite
 * Gharib (crater)
 * Gialo High
 * Giant impact hypothesis
 * Gibbsite
 * Gibeon (meteorite)
 * Gibraltar Arc
 * Gigantosaurus
 * Gilalite
 * Gildersleeve Mountain
 * Gillicus
 * Gilmoreosaurus
 * Gilsonite
 * Giraffa jumae
 * Girkin Formation
 * Givetian
 * Glacial Lake Algonquin
 * Glacial Lake Ojibway
 * Glacial erratic
 * Glacial polish
 * Glacial striation
 * Glaciated Rocks
 * Glacier
 * Glacier cave
 * Glacier morphology
 * Glaciokarst
 * Glaciolacustrine deposits
 * Glaciology
 * Glasford crater
 * Glass with embedded metal and sulfides
 * Glauberite
 * Glaucodot
 * Glauconie argileuse
 * Glauconite
 * Glaucophane
 * Glen Canyon Group
 * Glen Rose Formation
 * Glenshaw Formation
 * Glenwood Shale
 * Gley soil
 * Glikson crater
 * Glières Plateau
 * Global Boundary Stratotype Section and Point
 * Global Standard Stratigraphic Age
 * Global warming
 * Glomeroporphyritic
 * Glossary of geology
 * Glossopteridales
 * Glossotherium
 * Gloucestershire Geology Trust
 * Glover Bluff crater
 * Glyptodontopelta
 * Glyptotherium
 * Gmelinite
 * Gneiss
 * Gobiatherium
 * Gobipteryx
 * Gobititan
 * Godinotia
 * Goethite
 * Gogia
 * Gojirasaurus
 * Gokwe Formation
 * Gold mining in the United States
 * Goldich dissolution series
 * Goldmanite
 * Gomphos
 * Gomphotaria
 * Gondwana
 * Gondwanatitan
 * Gongxianosaurus
 * Gonnardite
 * Gonâve Microplate
 * Gooch Creek Arch
 * Gorda Plate
 * Gorda Ridge
 * Gormanite
 * Gorstian
 * Goslarite
 * Gossan
 * Gosses Bluff crater
 * Gotland Basin
 * Gotley Glacier
 * Gough's Cave
 * Gow crater
 * Goyder crater
 * Goyocephale
 * Graben
 * Graciliceratops
 * Graciliraptor
 * Graculavus
 * Graded bedding
 * Gradualism
 * Graftonite
 * Grainstone
 * Granby crater
 * Grand Coulee
 * Grand Staircase
 * Grandreefite
 * Granite
 * Granite Dells
 * Granite Mountain (Texas)
 * Granitoid
 * Granoblastic
 * Granodiorite
 * Granophyre
 * Granule (geology)
 * Granulite
 * Graphic texture
 * Gratonite
 * Gravel
 * Gravel bar
 * Gravelbourg Formation
 * Gravitholus
 * Gravity Recovery and Climate Experiment
 * Gravity anomalies of Britain and Ireland
 * Gravity anomaly
 * Gravity of Earth
 * Great Basin
 * Great Dyke
 * Great Falls Tectonic Zone
 * Great Gaw Fault
 * Great Glen Fault
 * Great Lakes tectonic zone
 * Great Oolite Formation
 * Great Ordovician Biodiversification Event
 * Great Oxygenation Event
 * Great Sumatran fault
 * Great Unconformity
 * Great pond
 * Green River Formation
 * Green ubatuba
 * Greendale Fault
 * Greenhorn Limestone
 * Greenhouse and icehouse Earth
 * Greenhouse gas
 * Greenland Plate
 * Greenockite
 * Greensand
 * Greenschist
 * Greenstone belt
 * Greererpeton
 * Gregory Beroza
 * Gregory Rift
 * Greigite
 * Grenville orogeny
 * Gres a Avicula contorta
 * Gres a Dinosauriens Formation
 * Gres de Labarre Formation
 * Gres de l'Infralias
 * Grey dune
 * Grigory Gamburtsev
 * Grillenburg Sandstone
 * Griman Creek Formation
 * Gritstone
 * Gros Ventre landslide
 * Grosmont Formation
 * Grossite
 * Grossopterus
 * Grossular
 * Ground-penetrating radar
 * Ground penetrating radar survey (archaeology)
 * Groundwater
 * Groundwater recharge
 * Groundwater sapping
 * Group (stratigraphy)
 * Grove Karl Gilbert
 * Grunerite
 * Grus (geology)
 * Gruta das Torres
 * Grypania
 * Gryphon (geology)
 * Grès et sables piquetés
 * Grès à Reptiles
 * Guadalupian
 * Guaibasaurus
 * Guanling Formation
 * Guano
 * Guanziling Hot Spring
 * Gudmundur S. (Bo) Bodvarsson
 * Guettioua Sandstone
 * Guiana Shield
 * Guichon Formation
 * Guilleminite
 * Guimarota
 * Gulf Trough
 * Gulf of Suez Rift
 * Gummite
 * Gurilynia
 * Gusev crater (Russia)
 * Guy Christian Collet
 * Guyedong Beds
 * Gweni-Fada crater
 * Gypcrust
 * Gypsum
 * Gypsum Springs Formation
 * Gyrodus
 * Gyrosteus
 * Gzhelian
 * Géoscope (geology)
 * HED meteorite
 * HMRG Deep
 * H chondrite
 * HaMakhtesh HaGadol
 * HaMakhtesh HaKatan
 * Habanocnus
 * Hack's law
 * Hadean
 * Hadrianus (genus)
 * Hadrocodium
 * Haffield Breccia
 * Hagendorfite
 * Haggertyite
 * Haig Fras
 * Hainina
 * Haiweeite
 * Halec
 * Halide minerals
 * Halimornis
 * Halitherium
 * Hallein Salt Mine
 * Hallirhoidae
 * Hallopora
 * Halmahera Arc
 * Halmahera Plate
 * Haloclasty
 * Halotrichite
 * Halticosaurus
 * Halwaxiida
 * Hamada
 * Hamberg Glacier
 * Hamilton Group
 * Hampen Marly Formation
 * Hampshire Basin
 * Hamstone
 * Hamza River
 * Hangenberg event
 * Hans J. Hofmann
 * Hanssuesia
 * Hantong Formation
 * Hanwulosaurus
 * Hapalodectes
 * Hapalodectidae
 * Hapalops
 * Hapkeite
 * Haplocanthosaurus
 * Haplophrentis
 * Haptodus
 * Haramiya
 * Hardouinia
 * Hardyston Quartzite
 * Hardystonite
 * Harebell Formation
 * Harlan's muskox
 * Harmer Glacier
 * Harmonic tremor
 * Harmotome
 * Harold Jeffreys
 * Harpagofututor
 * Harrat Lunayyir
 * Harrell Formation
 * Harry Hammond Hess
 * Harz granite
 * Hasandong Formation
 * Hastimima
 * Hauerite
 * Haughton impact crater
 * Hausmannite
 * Hauterivian
 * Hauyne
 * Haviland Crater
 * Hawaii Undersea Research Laboratory
 * Hawaii hotspot
 * Hawaiian Trough
 * Hawaiian eruption
 * Hawaiian–Emperor seamount chain
 * Hawk Mountain
 * Hawleyite
 * Hawthorn Group
 * Haxonite
 * Hayabusa
 * Hayoceros
 * Hayward Fault Zone
 * Head (geology)
 * Headward erosion
 * Healdsburg Fault
 * Heaney Glacier
 * Heavy mineral
 * Heazlewoodite
 * Hebeiornis
 * Hebridean Terrane
 * Hedenbergite
 * Hederellid
 * Heelstone Ditch
 * Hegetotheria
 * Hegetotheriidae
 * Heiberg Formation
 * Heilongjiangosaurus
 * Heinrich event
 * Heinz Kohnen
 * Heishansaurus
 * Helen M. Duncan
 * Helicoprion
 * Hellenic arc
 * Helvetic (geology)
 * Hematite
 * Hemicidaris
 * Hemimorphite
 * Hemisaurida
 * Henbury Meteorites Conservation Reserve
 * Henningsen Glacier
 * Henricosborniidae
 * Henry Benedict Medlicott
 * Henry Cavendish
 * Henry Gellibrand
 * Henry Testot-Ferry
 * Henry W. Posamentier
 * Heptodon
 * Herald Formation
 * Herbert Hall Turner
 * Herbertsmithite
 * Hercynite
 * Hermann Theodor Geyler
 * Herringbone cross-stratification
 * Hertfordshire puddingstone
 * Herz Glacier
 * Hesperocyoninae
 * Hesperosaurus
 * Hesperotestudo
 * Hessite
 * Heterodontosauriformes
 * Heterohyus
 * Heterolithic bedding
 * Hettangian
 * Heulandite
 * Hexagonal crystal system
 * Hexahedrite
 * Hexameryx
 * Hexaprotodon
 * Heyuannia
 * Hibolithes
 * Hibonite
 * Hiccles Cove Formation
 * Hidden Lake Formation
 * Hiemalora
 * High Arctic Large Igneous Province
 * High island
 * Highland Boundary Fault
 * Hilgardite
 * Hilina Slump
 * Hillier's Cave
 * Hillman Hall of Minerals and Gems
 * Hilt's law
 * Himalayacetus
 * Himalayan salt block
 * Hindeodus
 * Hipparion
 * Hippidion
 * Hippopotamus antiquus
 * Hippopotamus gorgops
 * Hirnantian
 * Hironosaurus
 * Hisanohamasaurus
 * Hisingerite
 * Historical earthquakes
 * Historical geology
 * Historical impacts of climate change
 * History of creationism
 * History of geology
 * History of geomagnetism
 * History of geophysics
 * History of mineralogy
 * History of mining in Sardinia
 * History of paleontology
 * History of the Earth
 * History of the Rove Formation
 * History of the petroleum industry in the United States
 * Histriasaurus
 * Hjulström curve
 * Hoazinoides
 * Hodges Glacier
 * Hodgkinsonite
 * Hoganas Formation
 * Hogback (geology)
 * Hoggar Mountains
 * Hoko River Formation
 * Holleford crater
 * Holocene
 * Holocene extinction
 * Holocephali
 * Holosteus
 * Holston Formation
 * Homalodotheriidae
 * Homalodotherium
 * Homerian
 * Homilite
 * Homocline
 * Honanotherium
 * Hong Kong Observatory
 * Hongshanornis
 * Honolulu Volcanic Series
 * Hoodoo (geology)
 * Hope Basin
 * Hope Fault
 * Hopeite
 * Hoplophoneus
 * Hoplophorus
 * Hoplopteryx
 * Horizon Deep
 * Horn River Formation
 * Hornblende
 * Horned gopher
 * Hornerstown Formation
 * Hornfels
 * Horolodectes sunae
 * Horse (geology)
 * Horse Lava Tube System
 * Horseshoe Bend (Arizona)
 * Horseshoe Canyon Formation
 * Horsethief Sandstone
 * Horsham Stone
 * Horst (geology)
 * Horst and graben
 * Horusornithidae
 * Hot spring
 * Hotspot (geology)
 * Houcheng Formation
 * Houdek (soil)
 * Houldjinian
 * How the Earth Was Made
 * Howardite
 * Howel Williams
 * Howlite
 * Hsandagolian
 * Hsanotherium
 * Huabeisaurus
 * Huajiying Formation
 * Huanghetitan
 * Huanglong Cave
 * Huangnitang
 * Huckleberry Ridge Tuff
 * Hudiesaurus
 * Hudson-Meng Bison Kill
 * Hueco Mountains
 * Hughmilleria
 * Hugo Benioff
 * Huincul Formation
 * Huiquanpu Formation
 * Hulitherium
 * Hulsanpes
 * Human fossil bones from the Muierii Cave and the Cioclovina Cave, Romania
 * Humboldt Fault
 * Humin
 * Humite
 * Hummelstown brownstone
 * Hummocky cross-stratification
 * Hunter-Bowen orogeny
 * Huntley Mountain Formation
 * Huntoniatonia
 * Hureaulite
 * Hutchinsonite
 * Hutton's Unconformity
 * Hutton Sandstone Formation
 * Huttonite
 * Hyalophane
 * Hyalopilitic
 * Hybodus
 * Hydraulic action
 * Hydraulic conductivity
 * Hydraulic fracturing
 * Hydraulic fracturing in the United Kingdom
 * Hydridic Earth theory
 * Hydrocarbon exploration
 * Hydrogen cycle
 * Hydrogen sulfide
 * Hydrogeology
 * Hydrogrossular
 * Hydrokenoelsmoreite
 * Hydrological phenomenon
 * Hydrological transport model
 * Hydrology
 * Hydrology of Hungary
 * Hydromagnesite
 * Hydrothermal vent
 * Hydrozincite
 * Hynerpeton
 * Hypercoryphodon
 * Hypersolvus
 * Hypersthene
 * Hypocenter
 * Hypselosaurus
 * Hypsibema
 * Hypsidoris
 * Hypsocormus
 * Hypsometric curve
 * Hyrachyus
 * Hyracodon
 * Hyracodontidae
 * Håleniusite-(La)
 * Høgsfjord
 * Hübnerite
 * IIE iron meteorite
 * Ianthasaurus
 * Iapetus Ocean
 * Iberian plate
 * Iberomesornis
 * Ibexian
 * Icaronycteris
 * Ice
 * Ice VII
 * Ice age
 * Ice core
 * Ice lens
 * Ice scour
 * Ice sheet dynamics
 * Ice sheet model
 * Ice tongue
 * Iceland hotspot
 * Iceland spar
 * Ichabodcraniosaurus
 * Ichnite
 * Ichnofacies
 * Ichnology
 * Ichnotaxon
 * Ichthyodectes ctenodon
 * Ichthyodectidae
 * Ichthyolestes
 * Ichthyolith
 * Ichthyotringa
 * Ichthyotringa damoni
 * Ictitherium
 * Ida Helen Ogilvie
 * Iddingsite
 * Idosawa Fault
 * Idrialite
 * Igdabatis
 * Ignacy Domeyko
 * Igneous differentiation
 * Igneous rock
 * Ikaite
 * Ilbandornis
 * Iles Formation
 * Ilimaussaq intrusive complex
 * Ilingoceros
 * Iljig Formation
 * Illinoian (stage)
 * Illinois Basin
 * Illite
 * Ilmakiur
 * Ilmenite
 * Ilokelesia
 * Ilumetsa crater
 * Ilvaite
 * Ilyinets crater
 * Imagocnus
 * Imagotaria
 * Imbrication (sedimentology)
 * Impact Field Studies Group
 * Impact crater
 * Impact event
 * Impact structure
 * Impactite
 * Imperial Fault Zone
 * Impsonite
 * In Beceten Formation
 * Inaria
 * Incised
 * Inclusion (mineral)
 * Incongruent melting
 * Incremental dating
 * Independence dike swarm
 * Index fossil
 * Index mineral
 * Index of geology articles
 * Index of plate tectonics articles
 * Index to Marine & Lacustrine Geological Samples
 * Indian Head Rock
 * Indian Plate
 * Indian River Bay
 * Indian Shield
 * Indite
 * Indo-Australian Plate
 * Indosaurus
 * Indosuchus
 * Indricothere
 * Indroda Dinosaur and Fossil Park
 * Induan
 * Induced polarization
 * Induced seismicity
 * Industrial mineral
 * Inertinite
 * Inferior Oolite Formation
 * Inge Lehmann
 * Inge Lehmann Medal
 * Inglis quarry
 * Iniopteryx
 * Inland sea (geology)
 * Inner core
 * Innuitian Mountains
 * Innuitian orogeny
 * Inosaurus
 * Institut de Physique du Globe de Paris
 * Institute of Vertebrate Paleontology and Paleoanthropology
 * Institution of Mining and Metallurgy
 * Insular Belt
 * Insular Islands
 * Insular Plate
 * Integrated Ocean Drilling Program
 * Interatheriidae
 * Interbedding
 * Interference colour chart
 * Interference figure
 * Interference ripples
 * Interior Plains
 * Interlake Formation
 * Intermagnet
 * Intermontane
 * Intermontane Belt
 * Intermontane Islands
 * Intermontane Plate
 * Intermontane Trench
 * Internal heating
 * Internal wave
 * International Commission on Stratigraphy
 * International Commission on the History of Geological Sciences
 * International Geomagnetic Reference Field
 * International Geoscience Programme
 * International Latitude Observatory
 * International Mineralogical Association
 * International Society for Rock Mechanics
 * International Union of Geodesy and Geophysics
 * International Union of Geological Sciences
 * Internide
 * Interplate earthquake
 * Intertidal wetland
 * Intertrappean Beds
 * Intraplate earthquake
 * Intrusion
 * Inversion (geology)
 * Invertebrate paleontology
 * Inyoite
 * Iodargyrite
 * Ionian
 * Iranian plateau
 * Iranotherium
 * Iren Dabasu Formation
 * Ireviken event
 * Iridium anomaly
 * Iron catastrophe
 * Iron cycle
 * Iron meteorite
 * Iron ore
 * Ironstone
 * Irumide Belt
 * Isaac Lea
 * Isanosaurus
 * Ischigualastia
 * Ischyodus
 * Ischyrhiza
 * Ischyromys
 * Ishbel Group
 * Isisaurus
 * Iso-Naakkima
 * Isograd
 * Isostasy
 * Isostatic depression
 * Isotemnidae
 * Isotope geochemistry
 * Israel Geological Society
 * Isua greenstone belt
 * Itacolumite
 * Itapecuru Formation
 * Itemirus
 * Itoigawa-Shizuoka Tectonic Line
 * Iturralde Crater
 * Iuticosaurus
 * Ivan Mushketov
 * Ivan Yefremov
 * Ivanantonia
 * Izanagi Plate
 * Izu-Ogasawara Trench
 * Izuki Formation
 * J. Clarence Karcher
 * J. Lamar Worzel
 * J. Willis Stovall
 * J Harlen Bretz
 * Jabal Waqf es Suwwan crater
 * Jack Hills
 * Jacobsite
 * Jacobsville Sandstone
 * Jadarite
 * Jadeitite
 * Jaduguda Uranium Mine
 * Jagua Formation
 * James A. Jensen
 * James B. Macelwane
 * James Dwight Dana
 * James Gates Percival
 * James Hopson
 * James Hutton
 * James Tennant (mineralogist)
 * Jamesonite
 * Jamoytius kerwoodi
 * Jan Mayen Microcontinent
 * Janassa
 * Janenschia
 * Janet Watson
 * Japan Median Tectonic Line
 * Jaramillo reversal
 * Jarosite
 * Jaroslav Perner
 * Jasper Palisade
 * Jasper conglomerate
 * Jasperoid
 * Javelina Formation
 * Jaxartosaurus
 * Jean Morlet
 * Jeanne d'Arc Basin
 * Jebel Duchan
 * Jebel Qatrani Formation
 * Jeffersonian Mammoth
 * Jeffersonite
 * Jeffersonville Limestone
 * Jeholodens
 * Jeholosaurus
 * Jeita Grotto
 * Jemez Lineament
 * Jenkins Glacier
 * Jennite
 * Jeremejevite
 * Jerrygibbsite
 * Jethro Teall
 * Jewel Geyser
 * Jewell Glacier
 * Jiangjunosaurus
 * Jiangshanosaurus
 * Jiangxia chaotoensis
 * Jiangzhou Cave System
 * Jimthompsonite
 * Jingshanosaurus
 * Jingxing Formation
 * Jinhua Formation
 * Jinju Formation
 * Jinzhouornis
 * Jinzhousaurus
 * Jiutaisaurus
 * Jixiangornis
 * Joachim Barrande
 * Jobaria
 * Jobu Formation
 * Jodhpur Group – Malani Igneous Suite Contact
 * Johann Friedrich Ludwig Hausmann
 * Johann Jakob Nöggerath
 * Johannite
 * John Arthur Phillips
 * John Day Formation
 * John Duer Irving
 * John Eddowes Bowman the Elder
 * John Hawkins (geologist)
 * John Livermore
 * John Marley (geologist)
 * John Mawe
 * John Milne
 * John Peter Lesley
 * John Phillips (geologist)
 * John Smith Flett
 * John Strong Newberry
 * John T. Robinson
 * John Tuzo Wilson
 * John Vidale
 * Joint (geology)
 * Joli Fou Formation
 * Jolliffeite
 * Jon Claerbout
 * Jonesite
 * Jordanite
 * Josef Augusta
 * Josef Ladislav Píč
 * Joseph Carne
 * Joseph G. Medlicott
 * Joseph Henry Collins
 * Joseph Leidy
 * Josephine Kablick
 * Josephoartigasia monesi
 * Journal of Climate
 * Journal of Hydrometeorology
 * Journal of Paleontology
 * Journal of Volcanology and Geothermal Research
 * Journal of the Atmospheric Sciences
 * Journal of the Geological Society
 * Juan de Fuca Plate
 * Juan de Fuca Ridge
 * Jubbulpuria
 * Jubilee Diamond
 * Judinornis
 * Judith River Formation
 * Judith River Group
 * Judith Schiebout
 * Julgoldite
 * Juniata Formation
 * Jurassic
 * Jurassic Coast
 * Juratyrant
 * Jurong Formation
 * Justus Ludwig Adolf Roth
 * Jólnir
 * Józef Grzybowski
 * KNM ER 1805
 * KNM ER 3733
 * KNM ER 406
 * KNM ER 992
 * KNM WT 17000
 * Kaali crater
 * Kaapvaal craton
 * Kaatialaite
 * Kadsi Formation
 * Kagasaurus
 * Kaijiangosaurus
 * Kaikō
 * Kaili Formation
 * Kainosite-(Y)
 * Kaiparowits Formation
 * Kakanaut Formation
 * Kakisa Formation
 * Kakuru
 * Kaladongar Formation
 * Kalahari Deposits
 * Kalahari craton
 * Kalazha Formation
 * Kalininite
 * Kalkkop crater
 * Kallanakurichi Formation
 * Kaluga crater
 * Kamacite
 * Kamchatka earthquakes
 * Kame
 * Kame delta
 * Kamensk crater
 * Kamil Crater
 * Kamiokite
 * Kampfite
 * Kanawinka Geopark
 * Kangaamiut dike swarm
 * Kangnasaurus
 * Kanguk Formation
 * Kanimblan Orogeny
 * Kankazagan Formation
 * Kankite
 * Kannemeyeria
 * Kannemeyeriidae
 * Kanoite
 * Kansas Geological Survey
 * Kanuites
 * Kaolin Deposits of Charentes Basin, France
 * Kaolinite
 * Kara crater
 * Karakul (Tajikistan)
 * Karaurus
 * Karikkoselkä
 * Karl Bernhard Zoeppritz
 * Karl Dietrich Eberhard Koenig
 * Karl Eichwald
 * Karl Ernst Adolf von Hoff
 * Karl Georg von Raumer
 * Karl Johann Bernhard Karsten
 * Karl Ledersteger
 * Karl Vogt
 * Karla crater
 * Karlite
 * Karongasaurus
 * Karoo Ice Age
 * Karoo Supergroup
 * Karoo System
 * Karst
 * Karst fenster
 * Karst spring
 * Kasimovian
 * Kaskapau Formation
 * Kaskaskia sequence
 * Kasota limestone
 * Katiki Formation
 * Katsuhiko Ishibashi
 * Katsuyamasaurus
 * Kayenta Formation
 * Kazakhstania
 * Kazim Ergin
 * Kačák Event
 * Kebira Crater
 * Keck Geology Consortium
 * Keg River Formation
 * Kegelite
 * Keilite
 * Keith Edward Bullen
 * Keith Runcorn
 * Kellaways Formation
 * Kelly West crater
 * Kelmayisaurus
 * Kem Kem Beds
 * Kenai Group
 * Kenn Plateau
 * Kenneth Carpenter
 * Kenneth Farley
 * Kenneth Hsu
 * Kenneth Oakley
 * Kenorland
 * Kentland crater
 * Kentriodon
 * Kenyapotamus
 * Keraterpeton
 * Kerguelen Plateau
 * Kerguelen hotspot
 * Kerichwa Valley Tuff
 * Kermadec-Tonga Subduction Zone
 * Kermesite
 * Kern Canyon Fault
 * Kerogen
 * Kerygmachela
 * Kettle (landform)
 * Ketton stone
 * Keuper marl
 * Keurusselkä
 * Keweenaw Fault
 * Key bed
 * Keyite
 * Keyser Formation
 * Keystone (limestone)
 * Kezilesu Formation
 * Kgagodi crater
 * Khaan
 * Khanty Ocean
 * Khetranisaurus
 * Khodzhakul Formation
 * Khok Kruat Formation
 * Killadeas – Seskinore Fault
 * Killas
 * Kimberella
 * Kimberlite
 * Kimmeridge Clay
 * Kimmeridgian
 * Kin-Yip Chun
 * Kingena
 * Kingoria
 * Kinnareemimus
 * Kinnegoe Fault
 * Kinoite
 * Kiowa Shale
 * Kirkwood Formation
 * Kirtley F. Mather
 * Kiskatinaw Formation
 * Kitadani Formation
 * Kivalina v. ExxonMobil Corporation
 * Kiyoo Mogi
 * Kiyoo Wadati
 * Kizil Caves
 * Kizylkumavis
 * Kjerulf Glacier
 * Klamelisaurus
 * Kleptothule
 * Klippe
 * Klonk
 * Knebelite
 * Knickpoint
 * Knotenschiefer
 * Kochite
 * Kodiak–Bowie Seamount chain
 * Kogaionidae
 * Kokoamu Greensand
 * Kola Superdeep Borehole
 * Kolbeckite
 * Kolka-Karmadon rock ice slide
 * Kolpochoerus
 * Komatiite
 * Konrad Bates Krauskopf
 * Kootenai Formation
 * Koparion
 * Kope Formation
 * Kopidodon
 * Koreanosaurus (theropod)
 * Kornerupine
 * Kortrijk Formation
 * Korycanar Formation
 * Kota Formation
 * Kotaneelee Formation
 * Kotasaurus
 * Kotcho Formation
 * Koum Formation
 * Kremersite
 * Krennerite
 * Krieselite
 * Krotite
 * Kryptops
 * Kröhnkite
 * Kuangyuan Series
 * Kuehneotheriidae
 * Kugitang Svita Formation
 * Kuiper quadrangle
 * Kukersite
 * Kukharenkoite-(Ce)
 * Kula-Farallon Ridge
 * Kula Plate
 * Kulceratops
 * Kungurian
 * Kunlun fault
 * Kunmingosaurus
 * Kuril–Kamchatka Trench
 * Kurkar
 * Kurnakovite
 * Kursk Magnetic Anomaly
 * Kursk crater
 * Kuszholia
 * Kutchicetus
 * Kutnohorite
 * Kuwajima Formation
 * Kvabebihyrax
 * Kvanefjeld
 * Kyangyan Series
 * Kyptoceras
 * Kärdla crater
 * König Glacier
 * Kīpuka
 * K–Ar dating
 * K–T boundary
 * LCROSS
 * LL chondrite
 * L chondrite
 * La Amarga Formation
 * La Biche Group
 * La Boca Formation
 * La Bocana Roja Formation
 * La Chapelle-aux-Saints 1
 * La Colonia Formation
 * La Espuela Coal Mine disaster
 * La Ferrassie 1
 * La Matilde Formation
 * La Moinerie crater
 * La Predrera de Rubies Formation
 * La Quinta Formation
 * La Voulte-sur-Rhône (lagerstätte)
 * Labocania
 * Labradorite
 * Lac des Îles igneous complex
 * Lachlan Fold Belt
 * Lacustrine
 * Lacustrine plain
 * Ladd Formation
 * Ladinian
 * Lady Knox Geyser
 * Laevisuchus
 * Lagerstätte
 * Laghy Fault
 * Laguna Colorada Formation
 * Laguna Palacios Formation
 * Laguna Salada Fault
 * Lake Bosumtwi
 * Lake Lappajärvi
 * Lake Maumee
 * Lake Timiskaming kimberlite field
 * Lake Toba
 * Lake Waco Formation
 * Lake Wanapitei
 * Lake Yanisyarvi
 * Lakota Formation
 * Lamaceratops
 * Lamalginite
 * Lamb Leer
 * Lambeth Group
 * Lameta Formation
 * Lametasaurus
 * Laminar flow
 * Lamination (geology)
 * Lammidhania
 * Lamont–Doherty Earth Observatory
 * Lamosite
 * Lamplughsaura
 * Lamproite
 * Lanarkite
 * Lanasaurus
 * Lancanjiangosaurus
 * Lance Formation
 * Lancing Glacier
 * Landform
 * Landslide
 * Landslide classification
 * Landslide mitigation
 * Langhian
 * Lansfordite
 * Lanthanite
 * Lanthanosuchus
 * Lanzhousaurus
 * Laornis
 * Lapilli
 * Laplandite-(Ce)
 * Laplatasaurus
 * Lapparentosaurus
 * Laptev Sea Rift
 * Lapworth Medal
 * Laramide orogeny
 * Laramidia
 * Large igneous province
 * Large volume volcanic eruptions in the Basin and Range Province
 * Largirostrornis
 * Larry Martin
 * Larvikite
 * Lasanius
 * Lastres Formation
 * Latah Formation
 * Late Cretaceous
 * Late Devonian
 * Late Devonian extinction
 * Late Heavy Bombardment
 * Late Imbrian
 * Late Jurassic
 * Late Miocene
 * Late Mississippian
 * Late Ordovician
 * Late Pennsylvanian
 * Late Pleistocene
 * Late Triassic
 * Latosol
 * Latouchella
 * Lau event
 * Laurasia
 * Laurence McKinley Gould
 * Laurentia
 * Laurentide ice sheet
 * Laurite
 * Lava
 * Lava Creek Tuff
 * Lava Flow Hazard Zones
 * Lava delta
 * Lava dome
 * Lava field
 * Lava filter
 * Lava tube
 * Lavacicle
 * Lavendulan
 * Law of included fragments
 * Law of superposition
 * Law of the wall
 * Lawn Hill crater
 * Lawrence Wager
 * Lawson Adit
 * Layered double hydroxides
 * Lazulite
 * Lazurite
 * Lea Park Formation
 * Lead-lead dating
 * Lead (geology)
 * Leadhillite
 * Leanchoilia
 * Leaverite
 * Lechatelierite
 * Lectavis
 * Leduc Formation
 * Legrandite
 * Lehigh Gap
 * Leightonite
 * Leiosphaerid
 * Lemurosaurus
 * Lenesornis
 * Lengenbach Quarry
 * Lens (geology)
 * Lens (hydrology)
 * Leon County, Florida paleontological sites
 * Leonard James Spencer
 * Leonardite
 * Leontinia
 * Leontiniidae
 * Lepidocrocite
 * Lepidoderma
 * Lepidolite
 * Lepidotes
 * Lepontin dome
 * Leptauchenia
 * Leptaucheniinae
 * Leptecodon
 * Leptictis
 * Leptocyon
 * Leptolepidae
 * Leptolepis
 * Leptomeryx
 * Leptoropha
 * Les Sables de Glos Formation
 * Lessemsaurus
 * Lestaillats Marls Formation
 * Lestidiops
 * Lethaia
 * Lethiscus
 * Leucogranite
 * Levee
 * Lewald Glacier
 * Lewis Caleb Beck
 * Lewisian complex
 * Lexovisaurus
 * Lhasa Plate
 * Lherzolite
 * Lianmuqin Formation
 * Liaoxiornis
 * Liard Formation
 * Liassaurus
 * Libanopristis
 * Libethenite
 * Libralces
 * Libycosaurus
 * Lichenometry
 * Lichida
 * Lickey Hills
 * Liebigite
 * Lied Glacier
 * Liesegang rings (geology)
 * Ligabueino
 * Ligabuesaurus
 * Light non-aqueous phase liquid
 * Likhoelesaurus
 * Limagne
 * Limenavis
 * Limestone
 * Limestone pavement
 * Limnic eruption
 * Limnofregata
 * Limognitherium
 * Limonite
 * Limpopo Belt
 * Linarite
 * Lineation (geology)
 * Linguliformea
 * Linhevenator
 * Linnaeite
 * Linthia
 * Liptinite
 * Liquiñe-Ofqui Fault
 * Lirainosaurus
 * Lisangou Formation
 * Lisheen Mine
 * Lissauer Breccia
 * List of 2004-2009 earthquakes
 * List of 20th-century earthquakes
 * List of Cornish geologists and explorers
 * List of Global Boundary Stratotype Sections and Points
 * List of North American Deserts
 * List of Penrose Medal winners
 * List of Sites of Special Scientific Interest in Cornwall
 * List of U.S. state minerals, rocks, stones and gemstones
 * List of Wollaston Medal recipients
 * List of caves in Brazil
 * List of caves in China
 * List of caves in the United States
 * List of cinder cones
 * List of deserts
 * List of deserts by area
 * List of dinosaur-bearing rock formations
 * List of earth and atmospheric sciences journals
 * List of earthquakes in California
 * List of earthquakes in Sichuan
 * List of fossil parks
 * List of fossil sites
 * List of fracture zones
 * List of free geophysics software
 * List of geochronologic names
 * List of geological faults of England
 * List of geological faults of Northern Ireland
 * List of geological faults of Scotland
 * List of geological faults of Wales
 * List of geological features on Triton
 * List of geological folds in Great Britain
 * List of geological phenomena
 * List of geologists
 * List of geophysicists
 * List of greenstone belts
 * List of historic tsunamis
 * List of impact craters in Africa
 * List of impact craters in Antarctica
 * List of impact craters in Asia
 * List of impact craters in Australia
 * List of impact craters in Canada
 * List of impact craters in Europe
 * List of impact craters in North America
 * List of impact craters in South America
 * List of impact craters on Earth
 * List of important publications in geology
 * List of karst springs
 * List of landforms
 * List of landslides
 * List of lunar meteorites
 * List of meteorite falls
 * List of minerals
 * List of minerals (complete)
 * List of minerals M–O (complete)
 * List of minerals named after people
 * List of minor planets/7201–7300
 * List of non-Dinosauria fossil trackway articles
 * List of ophiolites
 * List of orogenies
 * List of pterosaur-bearing stratigraphic units
 * List of rock formations in Serbia
 * List of rock formations in the United Kingdom
 * List of rock textures
 * List of rock types
 * List of sandstones
 * List of shields and cratons
 * List of spits (landforms)
 * List of stratigraphic units with dinosaur body fossils
 * List of stratigraphic units with dinosaur trace fossils
 * List of stratigraphic units with dinosaur tracks
 * List of stratigraphic units with indeterminate dinosaur fossils
 * List of stratigraphic units with ornithischian tracks
 * List of stratigraphic units with sauropodomorph tracks
 * List of stratigraphic units with theropod tracks
 * List of submarine topographical features
 * List of supercontinents
 * List of tectonic plate interactions
 * List of tectonic plates
 * List of types of amber
 * List of uranium mines
 * Listracanthus
 * Lists of earthquakes
 * Lists of mines
 * Lists of mines in the United States
 * Litchfieldite
 * Lithalsa
 * Lithic fragment (geology)
 * Lithic sandstone
 * Lithification
 * Lithiophilite
 * Lithoautotroph
 * Lithogenic silica
 * Lithology
 * Lithosphere
 * Lithostratigraphy
 * Lithotope
 * Litolophus
 * Littoral zone
 * Littorina Sea
 * Liverpool crater
 * Livingston Formation
 * Livingstonite
 * Lizard complex
 * Llandovery epoch
 * Llano Estacado
 * Llano Uplift
 * Llewellyn Formation
 * Lobocarcinus
 * Lobopodia
 * Lochkovian
 * Lock Haven Formation
 * Lockatong Formation
 * Lockne crater
 * Lode
 * Lodestone
 * Loellingite
 * Loess
 * Logan Formation
 * Logan Rock
 * Logancha crater
 * Logarithmic spiral beaches
 * Logoisk crater
 * Lohan Cura Formation
 * Lomas Coloradas Formation
 * Lomonosov Ridge
 * Lonar crater
 * Lonchodytes
 * London-Brabant Massif
 * London Basin
 * London Clay
 * Long Valley Caldera
 * Longchengornis
 * Longipteryx
 * Longirostravis
 * Longirostromeryx
 * Longmenshan Fault
 * Longwood Swallet
 * Lophiaspis
 * Lophiodon
 * Lopingian
 * Lopolith
 * Lorandite
 * Lord Howe Rise
 * Lord Howe seamount chain
 * Lorenzenite
 * Lorne plateau lavas
 * Los Alamitos Formation
 * Los Blanquitos Formation
 * Los Colorados Formation
 * Los Hornitos Formation
 * Losh, Wilson and Bell
 * Losillasaurus
 * Losing stream
 * Lossie Mouth Sandstone Formation
 * Lossiemouth Sandstone
 * Lost City (hydrothermal field)
 * Lost River Caverns
 * Lost World Caverns
 * Louann Salt
 * Louis Agassiz
 * Louis Caryl Graton
 * Louis Dollo
 * Louis L. Jacobs
 * Louis Lartet
 * Louisville hotspot
 * Louisville seamount chain
 * Lourinhasaurus
 * Lourinhã Formation
 * Love number
 * Loveringite
 * Low-velocity zone
 * Low island
 * Lower Dharmaram Formation
 * Lower Karoo Group
 * Lower Lias
 * Lower Lufeng Series
 * Lower Maleri Formation
 * Lower plane bed
 * Luanchuanraptor
 * Luangwa (cynodont)
 * Lucas Barrett
 * Lucas Glacier
 * Ludfordian
 * Ludiortyx
 * Ludlow epoch
 * Ludwigite
 * Lujanian
 * Lukousaurus
 * Lulzacite
 * Lumparn
 * Luna Leopold
 * Lunar meteorite
 * Luobi Cave
 * Luohandong Formation
 * Lupata Series
 * Lupeosaurus
 * Lura Formation
 * Lushangfen Formation
 * Lusitanosaurus
 * Lusotitan
 * Lustre (mineralogy)
 * Lutetian
 * Luxullianite
 * Luzon Volcanic Arc
 * Lycaenops
 * Lycoptera
 * Lycorhinus
 * Lycosuchus
 * Lynx Formation
 * Lyonsite
 * Lystromycter
 * M. King Hubbert
 * Maar
 * Maastricht Formation
 * Maastrichtian
 * Mabdi Formation
 * Macaque Cave
 * Macaulayite
 * Macdonaldite
 * Macellum of Pozzuoli
 * Maceral
 * Macha crater
 * Machaerid
 * Machaeroides
 * Machairodus
 * Mackenzie dike swarm
 * Mackenzie hotspot
 * Mackunda Formation
 * Macquarie Fault Zone
 * Macrauchenidia
 * Macraucheniidae
 * Macrocephalochelys
 * Macrocrystalline
 * Macrodelphinus
 * Macrodontophion
 * Macrofossil
 * Macroleter
 * Macronaria
 * Macrurosaurus
 * Macula (planetary geology)
 * Madison Group
 * Madocite
 * Madsenius
 * Madygen Formation
 * Mae Chan Fault
 * Maelestes
 * Mafic
 * Maghemite
 * Magma
 * Magma current theory
 * Magmatic underplating
 * Magnesian Conglomerate
 * Magnesioferrite
 * Magnet Cove igneous complex
 * Magnetic anomaly
 * Magnetic declination
 * Magnetic dip
 * Magnetic mineralogy
 * Magnetic survey (archaeology)
 * Magnetite
 * Magnetofossils
 * Magnetostratigraphy
 * Magnetotellurics
 * Magnirostris
 * Magsat
 * Magulodon
 * Magyarosaurus
 * Mahadek Formation
 * Mahantango Formation
 * Main stem
 * Majid Hassanizadeh
 * Malachite
 * Malacological Society of London
 * Malapai Hill
 * Malawisaurus
 * Malayaite
 * Malcolm McKenna
 * Maleevus
 * Maleri Formation
 * Mammoth Hot Springs
 * Mammut raki
 * Mammuthus africanavus
 * Mammuthus meridionalis
 * Man Shield
 * Mancos Shale
 * Mandschurosaurus
 * Mangerite
 * Manhartsberg
 * Manhattan schist
 * Manicouagan Reservoir
 * Manicouagan crater
 * Maniraptoriformes
 * Manitoba Group
 * Manning formula
 * Mannville Group
 * Manson crater
 * Mantellisaurus
 * Mantle (geology)
 * Mantle convection
 * Mantle plume
 * Mantle wedge
 * Manual of Mineralogy
 * Manuel Berberian
 * Maotianshan Shales
 * Maple Creek crater
 * Maquoketa Caves State Park
 * Maquoketa Group
 * Marathon Uplift
 * Marble
 * Marble Canyon
 * Marble Canyon (British Columbia)
 * Marcasite
 * Marcellin Boule
 * Marcellus Formation
 * Marcia McNutt
 * Maree Formation
 * Margaritasite
 * Margarite
 * Marginocephalia
 * Margyang Formation
 * Maria Gordon
 * Maria Klenova
 * Maria fold and thrust belt
 * Marialite
 * Mariana Plate
 * Mariana Trench
 * Maricite
 * Marikina Valley Fault System
 * Marine Geology
 * Marine clay
 * Marine geology
 * Marine regression
 * Marine transgression
 * Marinite
 * Marinoan glaciation
 * Mariposite
 * Marisaurus
 * Mark McMenamin
 * Marker horizon
 * Marl
 * Marland P. Billings
 * Marlborough Fault System
 * Marnes Irisees Superieures Formation
 * Marnes a Belemnopsis latesulcatus Formation
 * Marnes d'Auzas Formation
 * Marnes de Bleville Formation
 * Marnes de Chalin Formation
 * Marnes de Dives Formation
 * Marnes rouges de Roquelongue Formation
 * Marquesas hotspot
 * Marquez crater
 * Marrella
 * Marrite
 * Marros Group
 * Marshall Kay
 * Marshalltown Formation
 * Marshosaurus
 * Marsupiocrinus
 * Marsupites
 * Marthozite
 * Martian meteorite
 * Martin Bott
 * Martinsburg Formation
 * Marvin Mangus
 * Mary Anning
 * Mary Dawson (paleontologist)
 * Mary Somerville
 * Marywadea
 * Marília Formation
 * Mascarene Plateau
 * Masillaraptor
 * Maskelynite
 * Mass wasting
 * Massetognathus
 * Massif
 * Massopoda
 * Massospondylidae
 * Mastodon
 * Mastogloia Sea
 * Masuk Formation
 * Masuyite
 * Matanuska Formation
 * Mathematical geophysics
 * Matlockite
 * Matmor Formation
 * Matrix-supported rock
 * Matrix (geology)
 * Matsuo Group
 * Matt Lamanna
 * Matthew Paul Moyle
 * Maturity (geology)
 * Maturity (sedimentology)
 * Mauch Chunk Formation
 * Maucherite
 * Mauer 1
 * Maumee Torrent
 * Mauna Loa
 * Mawsonites
 * Maxberg specimen
 * May 30, 1998 Afghanistan earthquake
 * Mayan stage
 * Mayenite
 * Mayiacun Formation
 * Mazuku
 * McArthur Basin
 * McCoy Brook Formation
 * McKenzie Formation
 * McKittrick Tar Pits
 * McMurray Formation
 * McRae Formation
 * Mckelveyite
 * Mean square weighted deviation
 * Meander
 * Meander scar
 * Mecochirus longimanatus
 * Medea hypothesis
 * Medical geology
 * Medicine Bow Formation
 * Mediterranean Ridge
 * Meeteetse Formation
 * Megacerops
 * Megacervixosaurus
 * Megacryst
 * Megahippus
 * Megalocnus
 * Megalosauridae
 * Megalotragus
 * Megarachne
 * Megaraptor
 * Megatapirus
 * Megathrust earthquake
 * Megatsunami
 * Megatypus
 * Megawhaitsia
 * Meizoseismal area
 * Melanophlogite
 * Melanorosauridae
 * Melanosome (geology)
 * Melanterite
 * Melbourne Bone Bed
 * Melbournopterus
 * Melilite
 * Melissani Cave
 * Melonechinus
 * Meltwater pulse 1A
 * Menaspis
 * Mendeleev Ridge
 * Mendipite
 * Mendocino Fracture Zone
 * Mendocino Triple Junction
 * Mendozasaurus
 * Mendozite
 * Mene
 * Mene purdyi
 * Mene rhombea
 * Menefee Formation
 * Menefee Shale
 * Mengyin Formation
 * Mensa (geology)
 * Meramec (series)
 * Mercer Caverns
 * Merchantville Formation
 * Mercia Mudstone Group
 * Mereheadite
 * Merensky Reef
 * Merenskyite
 * Meridiungulata
 * Meristina
 * Merosaurus
 * Merycoidodon
 * Merycopotamus
 * Mesa Rica Formation
 * Mesaverde Formation
 * Mesoarchean
 * Mesocyon
 * Mesohippus
 * Mesolimulus
 * Mesonychidae
 * Mesonyx
 * Mesopithecus
 * Mesoplates
 * Mesoproterozoic
 * Mesoreodon
 * Mesosaurus
 * Mesosiderite
 * Mesosphere (mantle)
 * Mesozoic
 * Mesozoic Marine Revolution
 * Messelirrisor
 * Messelobunodon
 * Messinian
 * Messinian evaporite
 * Messinian salinity crisis
 * Metacheiromys
 * Metaconglomerate
 * Metailurus
 * Metal
 * Metallogeny
 * Metamorphic facies
 * Metamorphic rock
 * Metamorphism
 * Metamynodon
 * Metasediment
 * Metasomatism
 * Metaspriggina
 * Metatorbernite
 * Metavolcanic rock
 * Metazeunerite
 * Meteor Crater
 * Meteor shower
 * Meteorite
 * Meteorite fall statistics
 * Meteoritical Society
 * Meteoroid
 * Meteorological & Geoastrophysical Abstracts
 * Meteorological Monographs
 * Methane chimney
 * Methane clathrate
 * Metopaster
 * Metoposauroidea
 * Metoposaurus
 * Metridiochoerus
 * Miami Rock Ridge
 * Miargyrite
 * Miarolitic cavity
 * Mica
 * Michael Frogley
 * Michael Tuomey
 * Micraster
 * Microbial mat
 * Microbrachis
 * Microcephale
 * Microceratus
 * Microcline
 * Microcrystalline
 * Microdontosaurus
 * Microearthquake
 * Microgeomatics
 * Microlite
 * Micropachycephalosaurus
 * Micropaleontology
 * Microprobe
 * Microsauria
 * Microseism
 * Microurania
 * Microvenator
 * Mid-Atlantic Ridge
 * Mid-Brunhes Event
 * Mid-ocean ridge
 * Midcontinent Rift System
 * Middle America Trench
 * Middle Cambrian
 * Middle Devonian
 * Middle Jurassic
 * Middle Miocene
 * Middle Miocene disruption
 * Middle Mississippian
 * Middle Ordovician
 * Middle Pennsylvanian
 * Middle Pleistocene
 * Middle Triassic
 * Middlesboro crater
 * Midlothian Coalfield
 * Mien (lake)
 * Mifune Group
 * Mifunesaurus
 * Migmacastor
 * Migmatite
 * Mihune Formation
 * Mikael Fortelius
 * Milankovitch cycles
 * Mile Canyon
 * Milford granite (Massachusetts)
 * Milk River Formation
 * Millerite
 * Millstone Grit
 * Milutin Milanković
 * Mina Rosita Vieja disaster
 * Mina de Barroterán coal mine disaster
 * Mineral
 * Mineral Fork Formation
 * Mineral collecting
 * Mineral exploration
 * Mineral physics
 * Mineral wax
 * Mineralization (geology)
 * Mineralogical Society of America
 * Mineralogy
 * Mineralogy of the Pikes Peak Region
 * Mineraloid
 * Mining
 * Miniochoerus
 * Ministry of Mineral Resources (Sierra Leone)
 * Minnesota Geological Survey
 * Minoan eruption
 * Minyulite
 * Miocene
 * Miogeocline
 * Miopelecanus
 * Miotapirus
 * Mir mine
 * Mirabilite
 * Mirali Qashqai
 * Miria Formation
 * Mirovia
 * Mishina Gora crater
 * Mississippian
 * Mistastin crater
 * Mitchell Plain
 * Mitilanotherium
 * Mitrate
 * Mitsukurinidae
 * Mitsuse Formation
 * Mixopterus
 * Mixotoxodon
 * Mizarai crater
 * Mjølnir crater
 * Moab Fault
 * Moabosaurus
 * Mochlodon
 * Moenave Formation
 * Moenkopi Formation
 * Moghreberia
 * Mogote
 * Mohammed Naseeb Qureshy
 * Mohite
 * Mohorovičić discontinuity
 * Mohrite
 * Mohs scale of mineral hardness
 * Moine Supergroup
 * Moine Thrust Belt
 * Molasse
 * Molasse basin
 * Moldanubian Zone
 * Moldavite
 * Molecap Greensand
 * Mollie's Nipple
 * Molucca Sea Collision Zone
 * Molucca Sea Plate
 * Monadnock
 * Monazite
 * Mongolosaurus
 * Monkonosaurus
 * Monocline
 * Monogenetic volcanic field
 * Monograptus
 * Monolophosaurus
 * Mononykus
 * Mono–Inyo Craters
 * Monta Vista Fault
 * Montagnais crater
 * Montanoceratops
 * Monte Nuovo
 * Montehermosan
 * Monterey Formation
 * Montian
 * Montmorillonite
 * Montney Formation
 * Monturaqui crater
 * Monuran trackway
 * Monzonite
 * Mooihoekite
 * Moon-Airel Formation
 * Moon rock
 * Moonquake
 * Mooreville Chalk Formation
 * Moraine
 * Morainic drift
 * Morais Ophiolite Complex
 * Morasko meteorite nature reserve
 * Moreno Formation
 * Moreno Hill Formation
 * Morion (mineral)
 * Morokweng crater
 * Moropus
 * Morris Glacier
 * Morrison Formation
 * Morton Gneiss
 * Moschellandsbergite
 * Moscovian
 * Moscow Paleontological Museum
 * Motagua Fault
 * Motonori Matuyama
 * Mottramite
 * Mount Blanco
 * Mount Defiance (New York)
 * Mount Elkins
 * Mount Everest
 * Mount Garibaldi
 * Mount Independence
 * Mount Laurel Formation
 * Mount Meager
 * Mount Nittany
 * Mount Scott (Clackamas County, Oregon)
 * Mount St. Helens
 * Mount Tambora
 * Mount Toondina crater
 * Mount Vesuvius
 * Mountain
 * Mountain formation
 * Mouth bar
 * Mowry Shale Formation
 * Mpandi Formation
 * Mporokoso Group
 * Mud
 * Mud volcano
 * Mudcrack
 * Muddy River (Washington)
 * Mudflow
 * Mudpot
 * Mudrock
 * Mudslide
 * Mudstone
 * Muela de Ares
 * Mugher Mudstone Formation
 * Mulde event
 * Multiple-indicator kriging
 * Mundite
 * Munising Formation
 * Muonionalusta
 * Murchison meteorite
 * Murray Basin
 * Murtoi Formation
 * Musashino Terrace
 * Muschelkalk
 * Muscovite
 * Musgrave Block
 * Muskeg Formation
 * Muskiki Formation
 * Muskwa Formation
 * Mussaurus
 * Muva
 * Muyelensaurus
 * Mycterops
 * Mycterosaurus
 * Mylagaulidae
 * Mylonite
 * Myra Keen
 * Myreton Hill
 * Mélange
 * NASA/IPAC Extragalactic Database
 * NASA STI Program
 * NG 6
 * Nabalamprophyllite
 * Nachtigal Glacier
 * Nacimiento Formation
 * Nadir (topography)
 * Nagdong Formation
 * Nagyagite
 * Nahanni Formation
 * Nain province
 * Nakhla meteorite
 * Naknek Formation
 * Nakusia
 * Nalacetus
 * Naldrettite
 * Nam Phong Formation
 * Namacalathus
 * Nambaroo
 * Nambulite
 * Namurotypus
 * Nankai megathrust earthquakes
 * Nanningosaurus
 * Nanogeoscience
 * Nanopareia
 * Nanshiungosaurus
 * Nanyangosaurus
 * Napan Formation
 * Napier Mountains
 * Nappe
 * Narooma Terrane
 * Nash–Sutcliffe model efficiency coefficient
 * National Association of Black Geologists and Geophysicists
 * National Center for Earth-surface Dynamics
 * National Elevation Dataset
 * National Fossil Day
 * National Geology and Mining Service
 * National Geomagnetism Program
 * National Ice Core Laboratory
 * National Seismological Service
 * Native copper
 * Native element minerals
 * Native metal
 * Natrocarbonatite
 * Natural Arch, Tirumala hills
 * Natural arch
 * Natural history
 * Natural remanent magnetization
 * Naturaliste Plateau
 * Nature Geoscience
 * Navajo Sandstone
 * Navarin Canyon
 * Navesink Formation
 * Nazca Plate
 * Nazca Ridge
 * Neanis
 * Near-Earth object
 * Near-surface geophysics
 * Neath Disturbance
 * Necrolemur
 * Necrolestes
 * Necromanis
 * Nectarian
 * Nectridea
 * Nedcolbertia
 * Needmore Formation
 * Neimongosaurus
 * Nekrasovite
 * Nelsen Formation
 * Nemegt Formation
 * Nemegtomaia
 * Nemegtosaurus
 * Nena (supercontinent)
 * Nenadkevichite
 * Neo-creationism
 * Neoarchean
 * Neocathartes
 * Neochoerus
 * Neochoerus pinckneyi
 * Neocomian Sands
 * Neogaeornis
 * Neogene
 * Neoglyphiocerataceae
 * Neoglyphioceratidae
 * Neohelos
 * Neohibolithes
 * Neoicocerataceae
 * Neoicoceratidae
 * Neomorphism
 * Neoproterozoic
 * Neornithischia
 * Neosauropoda
 * Neosaurus
 * Neostacheoceratidae
 * Neotectonics
 * Neovenator
 * Nepheline
 * Nepheline syenite
 * Neptunism
 * Nesodon
 * Nestoritherium
 * Neugrund crater
 * Neuquenornis
 * Neuquensaurus
 * Neuquén Group
 * Nevadan orogeny
 * Nevadia
 * New Albany Shale
 * New Eddystone Rock
 * New Hebrides Plate
 * New Oxford Formation
 * New Red Sandstone
 * New Zealand Swan
 * New islands
 * Newark Basin
 * Newark Canyon Formation
 * Newark Group
 * Newmarracarroceras
 * Newport-Inglewood Fault
 * Newporte crater
 * Newry Fault
 * Newton Horace Winchell
 * Newtonsaurus
 * Ngalia Basin
 * Ngexisaurus
 * NiFe
 * Niagara Escarpment
 * Niah National Park
 * Nicholas Shackleton
 * Nicholson crater
 * Nichromite
 * Nickel deposits of Finland
 * Nickel–Strunz classification
 * Nicolas Steno
 * Niedermayrite
 * Nigel Anstey
 * Nikanassin Formation
 * Nikkasaurus
 * Nikolay Urvantsev
 * Nimbadon
 * Nimbahera stone
 * Nimbia
 * Nimravus
 * Niningerite
 * Niobrara Formation
 * Niobrarateuthis
 * Nipponites
 * Nittany Arch
 * Nittany Valley
 * Noasauridae
 * Noasaurus
 * Nodosaurus
 * Nodule (geology)
 * Noguerornis
 * Noir Belge
 * Noir de Golzinne
 * Noir de Mazy
 * Nomingia
 * Nomismocerataceae
 * Nomismoceratidae
 * Nonesuch Shale
 * Nootka Fault
 * Nopcsaspondylus
 * Nor'Wester Mountains
 * Norfolk Ridge
 * Norian
 * Noritaceae
 * Norite
 * Noritidea
 * Normal moveout
 * Norman Haskell
 * Norman L. Bowen
 * Normannites
 * North American Plate
 * North Atlantic Igneous Province
 * North China craton
 * North Island Fault System
 * North Island Takahē
 * North Magnetic Pole
 * North West Highlands Geopark
 * Northampton Sands Formation
 * Northern Cordilleran Volcanic Province
 * Northern Harz Boundary Fault
 * Northern river reversal
 * Norwood Ridge
 * Nosean
 * Nostoceratidae
 * Nothocyon
 * Nothropus
 * Nothrotheriops
 * Nothrotherium
 * Notioprogonia
 * Notoceratops
 * Notohippidae
 * Notorhynchus
 * Notostylopidae
 * Notostylops
 * Nototherium
 * Novacaesareala
 * Novopangaea
 * Nqwebasaurus
 * Nubian Sandstone
 * Nubian Sandstone Aquifer System
 * Nubian Swell
 * Nuclear Explosions for the National Economy
 * Nuculoceratidae
 * Numidotheriidae
 * Nunatak
 * Nurosaurus
 * Nuthetes
 * Népouite
 * Nördlinger Ries
 * OH 24
 * OH 5
 * OH 7
 * Oak Ridges Moraine
 * Oamaru stone
 * Oasis crater
 * Obduction
 * Obere Bunte Mergel
 * Obolon' crater
 * Obsidian
 * Ocala Limestone
 * Ocala Platform
 * Ocean-bottom seismometer
 * Ocean Drilling Program
 * Ocean acidification
 * Ocean island basalt
 * Oceanic basin
 * Oceanic core complex
 * Oceanic crust
 * Oceanic trench
 * Oceans of Kansas Paleontology
 * Ochil Fault
 * Ochoan
 * Octahedrite
 * Odessa Meteor Crater
 * Odobenocetops
 * Odontogriphus
 * Odontornithes
 * Oecoptychius
 * Oecotraustes
 * Oedaleops
 * Officer Basin
 * Offshore (hydrocarbons)
 * Offshore survey
 * Ogallala Aquifer
 * Ogygoptynx
 * Ohmdenosaurus
 * Oil sands
 * Oil shale
 * Oil shale geology
 * Oil shale reserves
 * Ojinaga Formation
 * Okhotsk Plate
 * Okribites
 * Okurodani Formation
 * Old Faithful
 * Old Port Formation
 * Old Red Sandstone
 * Oldest dated rocks
 * Oldest known object on Earth
 * Oldfieldthomasiidae
 * Oldhamia
 * Oldman Formation
 * Oleanane
 * Oleg Fisunenko
 * Olenekian
 * Oligocene
 * Oligokyphus
 * Olistostrome
 * Oliver Bulman
 * Oliver Perry Hay
 * Olivine
 * Olson's Extinction
 * Oltu stone
 * Olympic-Wallowa Lineament
 * Omagh Fault
 * Omagh Thrust
 * Omeisaurus
 * Omnivoropteryx
 * Omphacite
 * On Gong Formation
 * Oncala Group
 * Oncolite
 * Ondorukhaa Formation
 * OneGeology
 * Onega stepanovi
 * Onlap
 * Onondaga (geological formation)
 * Onondaga Formation
 * Onshore (hydrocarbons)
 * Ontario Geological Survey
 * Ontong Java Plateau
 * Onychopterella
 * Ooid
 * Oolite
 * Oolitic aragonite sand
 * Opabinia
 * Opal Pool
 * Ophiacodon
 * Ophiacodontidae
 * Ophiderpeton
 * Ophiderpetontidae
 * Ophioceratidae
 * Ophiolite
 * Oppelia
 * Optical relief
 * Orbicular granite
 * Orca Basin
 * Orcadian Basin
 * Orcomimus
 * Ordinary chondrite
 * Ordovician
 * Ordovician–Silurian extinction event
 * Ordóñezite
 * Ore genesis
 * Oregonite
 * Organic-rich sedimentary rocks
 * Organic geochemistry
 * Orientation tensor
 * Origin of water on Earth
 * Original horizontality
 * Orlock Bridge Fault
 * Ornatifilum
 * Ornatotholus
 * Ornithodesmus
 * Ornithomimoides
 * Ornithomimus
 * Orodromeus
 * Orodus
 * Orogeny
 * Orohippus
 * Oronto Group
 * Orosirian
 * Orpiment
 * Orthacanthus
 * Orthoclase
 * Orthogarantiana
 * Orthrozanclidae
 * Orthrozanclus
 * Orulganitidae
 * Osbornodon
 * Oscar Montgomery Lieber
 * Oseberg oil field
 * Oshanosaurus
 * Osmiridium
 * Osmond Fisher
 * Osteodontornis
 * Ostracod Limestone
 * Osumilite
 * Otavite
 * Othenio Abel
 * Othnielosaurus
 * Otocerataceae
 * Otoceratidae
 * Otoceratina
 * Otogosaurus
 * Otoites
 * Otsheria
 * Ottawa-Bonnechere Graben
 * Otto Jaekel
 * Ottrelite
 * Ouachita orogeny
 * Ouarkziz crater
 * Oum ed Diab Formation
 * Outburst flood
 * Outcrop
 * Outer core
 * Outer trench swell
 * Outline of geophysics
 * Outwash fan
 * Ovatoscutum
 * Overburden
 * Overburden pressure
 * Overdeepening
 * Overwash
 * Oxbow lake
 * Oxetocyon
 * Oxford Clay Formation
 * Oxfordian (stage)
 * Oxide minerals
 * Oxyacodon
 * Oxyaena
 * Oxycerites
 * Oxydactylus
 * Oxygen-18
 * Oxygen isotope ratio cycle
 * Oxynoticeras
 * Oyu Tolgoi mine
 * Ozraptor
 * POLARIS (seismology)
 * Paasselkä
 * Pab Formation
 * Pachyaena
 * Pachycormus
 * Pachyrukhos
 * Pachyteuthis
 * Pachytheca
 * Pachythrissops
 * Pacific-Antarctic Ridge
 * Pacific-Farallon Ridge
 * Pacific-Kula Ridge
 * Pacific Northwest Seismic Network
 * Pacific Plate
 * Packard Formation
 * Padragosiceras
 * Paha (landform)
 * Paibian
 * Painite
 * Paja Formation
 * Pakisaurus
 * Pakowki Formation
 * Palaeeudyptes
 * Palaeeudyptes antarcticus
 * Palaeeudyptes gunnari
 * Palaeeudyptes klekowskii
 * Palaeeudyptinae
 * Palaeocarpilius
 * Palaeogene
 * Palaeogeography
 * Palaeogeography, Palaeoclimatology, Palaeoecology
 * Palaeohatteria
 * Palaeolagus
 * Palaeoloxodon
 * Palaeolycus
 * Palaeomastodon
 * Palaeonisciformes
 * Palaeoniscum
 * Palaeophonus
 * Palaeoryctes
 * Palaeoryctoid
 * Palaeos
 * Palaeosauriscus
 * Palaeospheniscus
 * Palaeospheniscus bergi
 * Palaeospheniscus biloculatus
 * Palaeospheniscus gracilis
 * Palaeospheniscus patagonicus
 * Palaeospheniscus wimani
 * Palaeosyops
 * Palaeotherium
 * Palaeotis
 * Palaeotragus
 * Palaeotringa
 * Palaeoxylology
 * Palagonite
 * Palastericus
 * Palau Formation
 * Paleo-Tethys Ocean
 * Paleoarchean
 * Paleoatmosphere
 * Paleobiology (journal)
 * Paleobiota of the Niobrara Formation
 * Paleobotany
 * Paleocene
 * Paleocene dinosaur
 * Paleocene–Eocene Thermal Maximum
 * Paleoclimatology
 * Paleocollapse
 * Paleocoma
 * Paleoctenophora brasseli
 * Paleocurrent
 * Paleodictyon
 * Paleodictyon nodosum
 * Paleoecology
 * Paleogene
 * Paleogeology
 * Paleolimnology
 * Paleomagnetism
 * Paleomap
 * Paleontological Institute, Russian Academy of Sciences
 * Paleontological Society
 * Paleontology
 * Paleopedology
 * Paleoproterozoic
 * Paleoseismology
 * Paleosol
 * Paleotempestology
 * Paleothermometer
 * Paleozoic
 * Paleozoology
 * Palintropus
 * Pallasite
 * Palliser Formation
 * Palmason Model
 * Palorchestes
 * Palpebral (bone)
 * Paludal
 * Palustrine
 * Pambdelurion
 * Pamirioceras
 * Pan-African Ocean
 * Pan-African orogeny
 * Panasqueira
 * Pangaea
 * Pangaea Ultima
 * Panhole
 * Pannotia
 * Panochthus
 * Panoplosaurus
 * Pantelosaurus
 * Panthalassa
 * Panthera leo vereshchagini
 * Pantodonta
 * Pantolambda
 * Pantophilus
 * Pantylus
 * Paraceltitidae
 * Paraceltitina
 * Paradox Basin
 * Paraenhydrocyon
 * Paragastrioceratidae
 * Paragastrioceratinae
 * Paragenesis
 * Paraglacial
 * Parahesperornis
 * Parahippus leonensis
 * Parahoplitidae
 * Parahoplitinae
 * Paraisobuthus
 * Paralepis
 * Paralithic
 * Paramachairodus
 * Paramylodon
 * Paramys
 * Paranauchenia
 * Paranthodon
 * Paraperrinitinae
 * Paraphysornis
 * Parapropalaehoplophorus
 * Paraprotopteryx
 * Paraptenodytes brodkorbi
 * Paraptenodytes robustus
 * Parapuzosia
 * Parascopelus
 * Parashumarditidae
 * Parastrenoceras
 * Paratethys
 * Parathrinaxodon
 * Paratornoceratinae
 * Parenchodus
 * Parent rock
 * Parexus
 * Pari Aike Formation
 * Parisangulocrinus
 * Parisite-(Ce)
 * Parmularius
 * Parodoceratidae
 * Paronychodon
 * Parsonsite
 * Partial melting
 * Particle size
 * Particle size (grain size)
 * Parvancorina
 * Parvicursor
 * Paso del Sapo Formation
 * Pasquiaornis
 * Passaic Formation
 * Patagonykus
 * Patagosaurus
 * Patcham Formation
 * Pate Hole
 * Patrick Marshall
 * Patronite
 * Pattillo Higgins
 * Patuxent Formation
 * Paul's Island
 * Paul Renne
 * Paulscherrerite
 * Pavlovia
 * Paw Paw Formation
 * Peace River Formation
 * Peace River Formation (Florida)
 * Peak oil
 * Peale's Barber Farm Mastodon Exhumation Site
 * Pebble
 * Pebble Creek Formation
 * Pebbly Arkose Formation
 * Pecopteris
 * Pediment (geology)
 * Pedogenesis
 * Pedosphere
 * Pegmatite
 * Peishansaurus
 * Pekin Formation
 * Pelagic sediment
 * Pelargorhynchus
 * Pelite
 * Pellegrinisaurus
 * Pelso Plate
 * Peltobatrachus
 * Peléan eruption
 * Penelopognathus
 * Pengana
 * Penglaizhen Formation
 * Penikisite
 * Peninj Mandible
 * Peninsular Arch
 * Peninsular Gneiss
 * Pennant Measures
 * Pennsylvania Bluestone
 * Pennsylvania Geological Survey
 * Pennsylvanian
 * Penokean orogeny
 * Penroseite
 * Penta Geyser
 * Pentacrinites
 * Pentamerus
 * Pentasteria
 * Pentlandite
 * Pentremites
 * Peperite
 * Peramuridae
 * Percrocuta
 * Perennial stream
 * Pericyclaceae
 * Pericyclidae
 * Pericyclinae
 * Pericycloceratidae
 * Peridot
 * Peridotite
 * Period (geology)
 * Perisphinctes
 * Perite
 * Permeability (earth sciences)
 * Permian
 * Permian Sea
 * Permian–Triassic extinction event
 * Permineralization
 * Permo-Carboniferous
 * Perovskite
 * Perovskite (structure)
 * Perrinitidae
 * Perrinitinae
 * Persistence (discontinuity)
 * Perturbation (geology)
 * Peru-Chile Trench
 * Petalodontiformes
 * Petalodus
 * Pete Larson
 * Peter Clift
 * Peter Dodson
 * Peter Galton
 * Peter Huybers
 * Peter Szatmari (geologist)
 * Petermann Orogeny
 * Peters Glacier
 * Petoskey stone
 * Petrified Forest (Sarmiento)
 * Petrified Springs fault
 * Petrogenesis
 * Petrographic microscope
 * Petrography
 * Petroleum geochemistry
 * Petroleum geologist
 * Petroleum geology
 * Petroleum seep
 * Petrological Database of the Ocean Floor
 * Petrology
 * Petrophysics
 * Petrus Peregrinus de Maricourt
 * Pettigoe Fault
 * Petuntse
 * Petzite
 * Pezosiren
 * Phacolith
 * Phacopidae
 * Phacopoidea
 * Phanerite
 * Phaneritic
 * Phanerozoic
 * Pharmacosiderite
 * Pharyngolepis
 * Phaulostephanus
 * Phenacoceratidae
 * Phenocryst
 * Philip England
 * Philip R. Bjork
 * Philip Rashleigh
 * Philippi Glacier (South Georgia)
 * Philippine-Halmahera Arc
 * Philippine Fault System
 * Philippine Mobile Belt
 * Philippine Sea Plate
 * Phiomia
 * Phlaocyon
 * Phlebolepis
 * Phlegethontia
 * Phlogopite
 * Phoenix Plate
 * Phoenix Ridge
 * Pholiderpeton
 * Pholidocercus
 * Pholidophorus
 * Phosphate Beds
 * Phosphate minerals
 * Phosphophyllite
 * Phosphorite
 * Phosphuranylite
 * Phreatic
 * Phreatic eruption
 * Phreatomagmatic eruption
 * Phthinosuchus
 * Phu Kradung Formation
 * Phuwiangosaurus
 * Phylactocephalus
 * Phyllite
 * Phylloceratina
 * Phyllodus
 * Phyllolepis
 * Phylum
 * Phymosoma
 * Physical geodesy
 * Physics and Chemistry of Minerals
 * Physogaleus
 * Piacenzian
 * Piatnitzkysaurus
 * Piccaninny crater
 * Piceance Basin
 * Pichilemu Fault
 * Pictured Cliffs Formation
 * Piedras del Tunjo Archaeological Park
 * Piemont-Liguria Ocean
 * Pieniny Klippen Belt
 * Pierce Brodkorb
 * Pierre Bouguer
 * Pierre Formation
 * Pierre Martin (engineer)
 * Pierre Perrault (1608–1680)
 * Pierre Shale
 * Pierre de Jaumont
 * Pietraroia Plattenkalk
 * Pigeonite
 * Pikaia
 * Pikes Peak granite
 * Pilbara craton
 * Pilgrimella
 * Pillow lava
 * Pillow structure
 * Pilot crater
 * Pinalite
 * Pine Point Formation
 * Pingo
 * Pingualuit crater
 * Pinyon Conglomerate
 * Pipeflow
 * Pisanosaurus
 * Pit cave
 * Pit crater
 * Pitcairn hotspot
 * Pittsburg-Weir Coalfield
 * Pittsburgh Coalfield
 * Pittsburgh coal seam
 * Pituriaspida
 * Pituriaspis doylei
 * Piveteausaurus
 * Placer deposit
 * Placerias
 * Plagioclase
 * Plagiosternum
 * Plain
 * Planar deformation features
 * Planation
 * Plancheite
 * Planetary Data System
 * Planetary differentiation
 * Planetary engineering
 * Planetary geology
 * Planetary science
 * Planetetherium
 * Planicoxa
 * Planiplastron
 * Plankton
 * Platanaster
 * Plate Boundary Observatory
 * Plate reconstruction
 * Plate tectonics
 * Plateosauravus
 * Plateosauria
 * Plateosauridae
 * Platform (geology)
 * Platform cover
 * Plating (geology)
 * Platinum Metals Review
 * Platteville Limestone
 * Plattnerite
 * Platybelodon
 * Platyceratops
 * Platygonus
 * Platyhystrix
 * Platysomus
 * Platystrophia
 * Playfair's Law
 * Pleasanton Fault
 * Plegiocidaris
 * Pleistocene
 * Plesiadapidae
 * Plesiadapiformes
 * Plesiadapis
 * Plesictis
 * Plesiocidaris
 * Plesiolampas
 * Pleurocoelus
 * Pleurocystites
 * Pleuromeia
 * Pleuronodoceratidae
 * Pliensbachian
 * Plinian eruption
 * Pliocene
 * Pliohyrax
 * Pliopedia
 * Plume tectonics
 * Plunge pool
 * Plus minus method
 * Pluton
 * Pluvial
 * Pneumatolysis
 * Pockmark
 * Pocono Formation
 * Podokesaurus
 * Poebrotherium
 * Poecilomorphus
 * Poekilopleuron
 * Pogonodon
 * Poikilitic
 * Point Loma Formation
 * Point Lookout Sandstone
 * Point bar
 * Polar drift
 * Polar motion
 * Polarite
 * Polarity reversal
 * Pole shift hypothesis
 * Poleumita
 * Polje
 * Pollucite
 * Polybasite
 * Polycrase
 * Polygenetic volcanic field
 * Polystrate fossil
 * Ponerosteus
 * Ponor
 * Pontosmilus
 * Popanocerataceae
 * Popanoceratidae
 * Popigai crater
 * Popo Agie Formation
 * Popping Stone
 * Porcellanite
 * Porcupine Hills Formation
 * Porosity
 * Porphyritic
 * Porphyroblast
 * Porphyroclast
 * Porphyry (geology)
 * Port Hills Fault
 * Port Kennedy Bone Cave
 * Portland Formation
 * Portland stone
 * Portlandite
 * Posidonienschiefer
 * Post-glacial rebound
 * Post-perovskite
 * Postcrania
 * Posttornoceratidae
 * Posttornoceratinae
 * Potamal
 * Potamornis
 * Potamotherium
 * Pothole (geology)
 * Potomac Formation
 * Potsdam Sandstone
 * Potton Sands
 * Pottsville Formation
 * Pounamu
 * Pradhania
 * Praebigotites
 * Praecambridium
 * Praeglyphioceratidae
 * Praeornis
 * Praeparkinsonia
 * Praestrigites
 * Pragian
 * Prairie Bluff Chalk Formation
 * Pranhita–Godavari Basin
 * Pre-Nectarian
 * Precambrian
 * Precarious boulder
 * Precursor (bird)
 * Predator trap
 * Prehistoric life
 * Prehistoric mammal
 * Prehistoric tsunamis
 * Prehnite
 * Prehnite-pumpellyite facies
 * Preiesener Formation
 * Presbyornis
 * President of the Geological Society of London
 * Presqu'île crater
 * Pressure solution
 * Presumpscot Formation
 * Priabonian
 * Priddy Caves
 * Pridoli
 * Primapus
 * Primitive mantle
 * Primordial element
 * Primordial water
 * Principle of faunal succession
 * Principle of original horizontality
 * Principles of Geology
 * Prionocerataceae
 * Prionoceratidae
 * Prionoceratinae
 * Prionolepis
 * Priscacara
 * Prism (geology)
 * Pristerognathus
 * Pristerognathus Assemblage Zone
 * Pristiguana
 * Proardea
 * Proarticulata
 * Probactrosaurus
 * Probainognathidae
 * Probainognathus
 * Problems in coal mining
 * Proburnetia
 * Procamelus
 * Proceratosaurus
 * Procerites
 * Procerosaurus
 * Procoptodon
 * Procynosuchidae
 * Procynosuchus
 * Prodeinodon
 * Prodeinotherium
 * Prodromitidae
 * Proglacial lakes of Minnesota
 * Progradation
 * Project Mohole
 * Prolibytherium
 * Prolobitidae
 * Prolobitinae
 * Promegatherium
 * Proornis
 * Propalaeocastor
 * Propanoplosaurus
 * Propantes
 * Prophaethon
 * Propliopithecus
 * Propylitic alteration
 * Prorastomus
 * Prorsisphinctes
 * Prosantorhinus
 * Prosqualodon
 * Protapirus
 * Protarchaeopteryx
 * Protaspididae
 * Protemnodon
 * Proterozoic
 * Protichnites
 * Protitanops
 * Proto-Tethys Ocean
 * Protobrama
 * Protoceras
 * Protoceratinae
 * Protocetus
 * Protochelydra
 * Protoclepsydrops
 * Protoecotrausites
 * Protognathosaurus
 * Protoichnites
 * Protolith
 * Protophasma
 * Protopteryx
 * Protorthoptera
 * Protungulatum
 * Protylopus
 * Protypotherium
 * Proustite
 * Psammite
 * Psammosteidae
 * Psaronius
 * Pseudaelurus
 * Pseudaptenodytes
 * Pseudarietitinae
 * Pseudoclymeniidae
 * Pseudofossil
 * Pseudogarantiana
 * Pseudogastrioceratinae
 * Pseudohaloritaceae
 * Pseudohaloritidae
 * Pseudohaloritinae
 * Pseudoltinomys
 * Pseudomalachite
 * Pseudoparalegoceratidae
 * Pseudopetalichthyida
 * Pseudoprotoceras
 * Pseudotachylite
 * Pseudotirolitidae
 * Pseudotoites
 * Pseudotribos
 * Psilophyton
 * Pteraspida
 * Pteraspis
 * Pteridinium
 * Pterocoma
 * Pteropelyx
 * Pterospondylus
 * Ptolemaiida
 * Ptychodus
 * Pucabatis
 * Pucapristis
 * Puchezh-Katunki crater
 * Puente Hills Fault
 * Puertasaurus
 * Puerto Yuerua Formation
 * Pukyongosaurus
 * Pulhamite
 * Pull apart basin
 * Pultusk (meteorite)
 * Pumice
 * Pumice raft
 * Purbeck Group
 * Purbeck Limestone Formation
 * Purbeck Monocline
 * Pure shear
 * Purgatorius
 * Purpurite
 * Purvis Glacier
 * Pycnodus
 * Pycnonemosaurus
 * Pygmy Mammoth
 * Pyotr Nikolayevich Kropotkin
 * Pyrargyrite
 * Pyrite
 * Pyrochlore
 * Pyroraptor
 * Pyrotheria
 * Pyrotheriidae
 * Pyrotherium
 * Pyroxene
 * Pyroxferroite
 * Pyroxmangite
 * Pyrrhotite
 * Pääkkönenite
 * QFL diagram
 * Qagannur Formation
 * Qigu Formation
 * Qingshan Formation
 * Qinlingosaurus
 * Quaesitosaurus
 * QuakeFinder
 * QuakeSat
 * Quake (natural phenomenon)
 * Quantou Formation
 * Quarry
 * Quarterly Journal of the RAS
 * Quarterly Journal of the Royal Astronomical Society
 * Quarternary
 * Quartz
 * Quartz arenite
 * Quartz latite
 * Quartz monzonite
 * Quartzite
 * Quaternary
 * Quaternary Geochronology
 * Quaternary extinction event
 * Quaternary geology
 * Quaternary science
 * Quebrada del Barro Formation
 * Queen Charlotte Basin
 * Queen Charlotte Fault
 * Queen Charlotte Triple Junction
 * Queenston Delta
 * Quenstedtite
 * Querandiornis
 * Quercypsitta
 * Quiba Formation
 * Quicksand
 * Quintinite
 * Quiriquina Formation
 * R. A. F. Penrose, Jr.
 * R. S. Lull
 * Rachitrema
 * Radiocarbon dating
 * Radiolarite
 * Radiometric dating
 * Radula
 * Rae craton
 * Ragozinka crater
 * Rain-out model
 * Rainbow Springs
 * Rainbow Springs State Park
 * Raindrop impressions
 * Rake (geology)
 * Ralph Molnar
 * Ramapo Fault
 * Rameauite
 * Ramositidae
 * Randa rockslides
 * Randolph Kirkpatrick
 * Rangea
 * Rangeomorph
 * Rangeomorpha
 * Rapakivi granite
 * Rapanui Rock
 * Rapator
 * Raphael Pumpelly
 * Rare earth element
 * Raritan Formation
 * Raspite
 * Ratchasimasaurus
 * Raton Basin
 * Rauk
 * Raul–Yuri Georgievich Ervier
 * Raven Ridge
 * Ravenscrag Formation
 * Ravine
 * Raymond Fault
 * Raymond Jeanloz
 * Raymond R. Rogers
 * Raymondoceratinae
 * Raymundo Punongbayan
 * Rayoso Formation
 * Rayososaurus
 * Reactions to the 2008 Sichuan earthquake
 * Realgar
 * Rebbachisaurus
 * Recrystallization (geology)
 * Red Butte
 * Red Gulch Dinosaur Tracksite
 * Red Hills Region
 * Red Mediterranean soil
 * Red Mountain (Birmingham)
 * Red Mountain Expressway Cut
 * Red River Formation
 * Red Wing crater
 * Red hill (salt making)
 * Redknife Formation
 * Reed Flute Cave
 * Reedsville Formation
 * Reef knoll
 * Reference ellipsoid
 * Reflection seismology
 * Reginald Aldworth Daly
 * Reginald Hooley
 * Region of freshwater influence
 * Regnellites
 * Regnosaurus
 * Regurgitalith
 * Rejuvenation (river)
 * Relative dating
 * Relict
 * Remingtonocetus
 * Remote sensing (archaeology)
 * Renierite
 * Rennell Island
 * René Lavocat
 * Repository for radioactive waste Morsleben
 * Restite
 * Resurgent dome
 * Reticuloceratidae
 * Retrogradation
 * Reuchenette Formation
 * Reuverian
 * Reviews of Geophysics
 * Reynir Bödvarsson
 * Rhabdodon
 * Rhabdodontidae
 * Rhacolepis
 * Rhadinosaurus
 * Rhaetian
 * Rhaetic Beds
 * Rharbichthys
 * Rheic Ocean
 * Rheid
 * Rheniite
 * Rhenohercynian Zone
 * Rhine rift
 * Rhinosauriscus
 * Rhinotitan
 * Rhodite
 * Rhodolith
 * Rhodonite
 * Rhodplumsite
 * Rhombodus
 * Rhopalodon
 * Rhuddanian
 * Rhyacian
 * Rhymmoceratidae
 * Rhynchaeites
 * Rhynchippus
 * Rhynchodercetis
 * Rhyncholepis
 * Rhynia
 * Rhynie chert
 * Rhyodacite
 * Rhyolite
 * Rhythmite
 * Rhytidosteidae
 * Rhätsandstein
 * Riachão Ring
 * Rice Northwest Museum of Rocks and Minerals
 * Richard C. Aster
 * Richard Dixon Oldham
 * Richard Edmonds (scientist)
 * Richard Funkhouser
 * Richards equation
 * Richat Structure
 * Ridge
 * Ridge push
 * Riebeckite
 * Rift
 * Rift lake
 * Rift valley
 * Rim (craters)
 * Rimella fissurella
 * Rimstone
 * Ring dike
 * Ring of Gullion AONB
 * Ringbone Formation
 * Ringing rocks
 * Rio Cuarto craters
 * Riojasauridae
 * Riojasaurus
 * Ripley Formation
 * Ripple marks
 * Rippon Glacier
 * Riprap
 * Risting Glacier
 * Ritchey Knob
 * Ritland crater
 * River
 * River anticlines
 * River bifurcation
 * River channel migration
 * River delta
 * Rivera Plate
 * Rivera Triple Junction
 * Riverbluff Cave
 * Roadian
 * Roaldite
 * Robert Alfred Cloyne Godwin-Austen
 * Robert Etheridge
 * Robert Hazen
 * Robert Hunter (Encyclopædist)
 * Robert John Lechmere Guppy
 * Robert Kidston
 * Robert M. Hirsch
 * Robert Mallet
 * Robert Norman
 * Robert S. Dietz
 * Roberto Mantovani
 * Rocasaurus
 * Roche moutonnée
 * Rochechouart crater
 * Rochester Rock Art Panel
 * Rock (geology)
 * Rock Elm Disturbance
 * Rock Magnetism
 * Rock cycle
 * Rock formations in Greece
 * Rock formations in Russia
 * Rock formations in Slovakia
 * Rock fragment
 * Rock glacier
 * Rock magnetism
 * Rock mass classification
 * Rock of Gibraltar
 * Rock of Solutré
 * Rock of Vergisson
 * Rock physics
 * Rockall Basin
 * Rockfall
 * Rocky Face Fault
 * Rocky Mountain Association of Geologists
 * Rocky Mountain Trench
 * Rocky Mountains
 * Rodeites
 * Roderick Murchison
 * Rodinia
 * Rodolfo Amando Philippi
 * Rodolfo Coria
 * Rogen moraine
 * Rollin D. Salisbury
 * Romanche Trench
 * Romeu Beltrão
 * Ron Scarlett
 * Rookery
 * Roque Nublo
 * Roscoelite
 * Rose Canyon Fault
 * Roselite
 * Rosemanowes Quarry
 * Ross Stein
 * Rossiter W. Raymond
 * Roter Kamm crater
 * Rotmistrivka crater
 * Rounding (sediment)
 * Roundness (geology)
 * Rouse number
 * Routhierite
 * Rowley Rag
 * Roxbury Conglomerate
 * Roxbury conglomerate
 * Royal Astronomical Society
 * Royal Geological Society of Cornwall
 * Rozenite
 * Rudolf Ruedemann
 * Ruehleia
 * Ruhpolding Formation
 * Runaway climate change
 * Rundle Group
 * Rupelian
 * Rupes
 * Rusophycus
 * Russellite
 * Rutellum
 * Rutgers Glacier
 * Rutgers geological sciences
 * Rutherfordine
 * Ryan Glacier
 * Ryedale Windypits
 * Rynersonite
 * Rytiodus
 * Ryugase Group
 * Ryukyu Trench
 * Réunion hotspot
 * Río de la Plata craton
 * SANSA Space Science
 * SIMBAD
 * SKS waves
 * SK 46
 * SK 48
 * SMR classification
 * SPIN bibliographic database
 * STS 14
 * STS 71
 * SWEAT (hypothesis)
 * S P Crater
 * Saarijärvi crater
 * Sabatierite
 * Sabieite
 * Sabinaite
 * Sabkha
 * Sables de Breze
 * Sables de Cherre
 * Sables du Lussant
 * Sables et Gres a Trigonia gibbosa
 * Sables vert de l'Albien Formation
 * Safe Harbor Dam
 * Safflorite
 * Sag (geology)
 * Sagenocrinites
 * Sagisma
 * Sahaliyania
 * Saichania
 * Sailing stones
 * Saint Anthony Falls Laboratory
 * Saint David's Buried Gorge
 * Saint Lawrence rift system
 * Saint Martin crater
 * Sakmarian
 * Salar de Uyuni
 * Saleeite
 * Saline evaporites
 * Salomon Glacier
 * Salt dome
 * Salt dome Gorleben
 * Salt glacier
 * Salt marsh
 * Salt pan (geology)
 * Salt tectonics
 * Salt tide
 * Saltrio Formation
 * Salzburgite
 * Samad (crater)
 * Samarskite-(Y)
 * Sampleite
 * Samsonite (mineral)
 * Samuel Allport
 * Samuel Beckles
 * Samuel Calvin (geologist)
 * Samuel Hibbert-Ware
 * Samuel Kneeland (naturalist)
 * Samuel Pickworth Woodward
 * Samuelsonite
 * San Andreas Fault
 * San Benedicto Island
 * San Bernardino Valley
 * San Carlos Formation
 * San Diego Formation
 * San Gabriel Fault
 * San Gregorio Fault
 * San Jacinto Fault Zone
 * San Joaquin Fault
 * San Juan volcanic field
 * Sanchusaurus
 * Sand
 * Sand Wells Formation
 * Sand sheet
 * Sand volcano
 * Sandalodus
 * Sandfall
 * Sandplain
 * Sandstone
 * Sangarskaya Svita
 * Sangiran 2
 * Sangonghesaurus
 * Sangping Formation
 * Sanidine
 * Sanpasaurus
 * Santa Clara Volcano
 * Santa Clara valley aquifer
 * Santa Fe impact structure
 * Santa Maria Formation
 * Santa Rosa Formation
 * Santana Formation
 * Santanaraptor
 * Santite
 * Santonian
 * Sanukitoid
 * Sao Francisco craton
 * Sao Khua Formation
 * Saponite
 * Sapropel
 * Sarabauite
 * Sarcolestes
 * Sarcoprion
 * Sarcosaurus
 * Sarkastodon
 * Sarmatian craton
 * Sarsen
 * Saskatchewan Group
 * Sassolite
 * Satellite geodesy
 * Sauk sequence
 * Saurichthys
 * Saurophaganax
 * Sauroplites
 * Sauropodus
 * Saurorhamphus
 * Savage Mountain
 * Sawatch Uplift
 * Sawmill Geyser
 * Saxothuringian Zone
 * Sayh al Uhaymir 169
 * Sazavis
 * Scalabrinitherium
 * Scapanorhynchus
 * Scaphites
 * Scarrittia
 * Scelidotherium
 * Schacht Asse II
 * Schacht Konrad
 * Scheelite
 * Scherr Formation
 * Schiehallion experiment
 * Schist
 * Schistocerataceae
 * Schistoceratidae
 * Schizorhiza
 * Schmidt Glacier
 * Schmidt hammer
 * Schmiederite
 * Schochia
 * Schoepite
 * Schooler Creek Group
 * Schrader Glacier
 * Schreibersite
 * Schreyerite
 * Schröckingerite
 * Schuylkill Gap
 * Schwertmannite
 * Schäferite
 * Scientific drilling
 * Sclavia craton
 * Sclerometer
 * Sclerorhynchus
 * Sclerotic ring
 * Scolecodont
 * Scollard Formation
 * Scorodite
 * Scorzalite
 * Scotia Plate
 * Scree
 * Scripps Canyon
 * Scriptural geologist
 * Scrutinyite
 * Scutellosaurus
 * Sea-level curve
 * Sea cave
 * Sea level
 * Sea level equation
 * Seafloor massive sulfide deposits
 * Seafloor spreading
 * Seattle Fault
 * Sebakwe craton
 * Sebayashi Formation
 * Secernosaurus
 * Sectility
 * Section restoration
 * Secunduri Formation
 * Sedcad
 * Sediment
 * Sediment gravity flow
 * Sediment transport
 * Sediment trap (geology)
 * Sedimentary basin
 * Sedimentary basin analysis
 * Sedimentary budget
 * Sedimentary depositional environment
 * Sedimentary deposits
 * Sedimentary exhalative deposits
 * Sedimentary organic matter
 * Sedimentary rock
 * Sedimentary structures
 * Sedimentology
 * Segelerite
 * Seifertite
 * Seismic anisotropy
 * Seismic gap
 * Seismic migration
 * Seismic refraction
 * Seismic scale
 * Seismic shadowing
 * Seismic source
 * Seismic tomography
 * Seismicity of the Sanriku coast
 * Seismite
 * Seismo-electromagnetics
 * Seismogram
 * Seismology
 * Sekaninaite
 * Sekiya Seikei
 * Selandian
 * Selenide minerals
 * Selenopeltis
 * Sellosaurus
 * Selma Group
 * Selwyn Range (Australia)
 * Semionotiformes
 * Semionotus
 * Sengoku Formation
 * Septentrional-Oriente fault zone
 * Sequence (geology)
 * Sequence stratigraphy
 * Sergei Kurzanov
 * Series (stratigraphy)
 * Serpent Mound crater
 * Serpentine group
 * Serpentine soil
 * Serpentinite
 * Serpukhovian
 * Serra Fault
 * Serra da Cangalha
 * Serranopsis
 * Serravallian
 * Sespe Formation
 * Sespia
 * Seven-Star Cave
 * Seven Tubs Natural Area
 * Severn Formation
 * Sevier orogeny
 * Sewardite
 * Shadow zone
 * Shale gas
 * Shale gas in the United States
 * Shamosaurus
 * Shanag
 * Shandite
 * Shansitherium
 * Shantungosaurus
 * Shanyang Formation
 * Shanyangosaurus
 * Shaochilong
 * Shar Teeg Beds
 * Sharp's Hill Formation
 * Shastoceras
 * Shatsky Rise
 * Shatter Cave
 * Shatter cone
 * Shaunavon Formation
 * Shawangunk Formation
 * Shear (geology)
 * Shear wave splitting
 * Shear zone
 * Sheeted dyke complex
 * Sheinwoodian
 * Shellenberger Canyon Formation
 * Shelly limestone
 * Shendi Formation
 * Shennongtherium
 * Sherwood Sandstone Group
 * Shestakovskaya Svita
 * Shield (geology)
 * Shield volcano
 * Shields parameter
 * Shinekhudag Svita
 * Shingle beach
 * Shishugou Formation
 * Shiva Hypothesis
 * Shiva crater
 * Shixinggia
 * Shoal
 * Shock metamorphism
 * Shocked quartz
 * Shoemaker crater
 * Shonkin Sag
 * Shouchangoceratinae
 * Shrink-swell capacity
 * Shuang River Cave Group
 * Shuanglong Cave
 * Shuangmiaosaurus
 * Shumarditaceae
 * Shumarditidae
 * Shunak crater
 * Shungura Formation
 * Shuttle Meadow Formation
 * Shuttle Radar Topography Mission
 * Sial
 * Siamodon
 * Siamosaurus
 * Siamotyrannus
 * Siberia (continent)
 * Siberian Shelf
 * Siberian Traps
 * Siccar Point
 * Sicilian Stage
 * Sidcot Swallet
 * Side-scan sonar
 * Sideling
 * Siderian
 * Siderite
 * Siderotil
 * Sidney H. Haughton
 * Siegenian
 * Sierra Madera crater
 * Sierra Negra (Galápagos)
 * Sierra Nevada Batholith
 * Sierra Perenchiza Formation
 * Sifrhippus
 * Sigismund Ernst Richard Krone
 * Sigriswiler Rothorn
 * Sikeston Ridge
 * Sikhote-Alin meteorite
 * Silcrete
 * Silfra
 * Silicate minerals
 * Siliceous ooze
 * Siliceous rock
 * Silicon dioxide
 * Siljan (lake)
 * Sill (geology)
 * Sill swarm
 * Silt
 * Silurian
 * Silvabestius
 * Silver Creek Fault
 * Silver mining in Colorado
 * Silver mining in Nevada
 * Silver mining in the United States
 * Silverpit crater
 * Sima (geology)
 * Simocyon
 * Simpsonite
 * Sincosite
 * Sindbad (crater)
 * Sinemurian
 * Singing sand
 * Sinkhole
 * Sinkhole Dersios
 * Sinoconodon
 * Sinornis
 * Sinornithoides
 * Sinosaurus
 * Sinotitinae
 * Sinovenator
 * Sinraptoridae
 * Sinuiju Formation
 * Sinuosity
 * Sinusonasus
 * Sioux Quartzite
 * Sirius Passet
 * Sisquoc Formation
 * Sistema Ox Bel Ha
 * Sivatherium
 * Sixmilewater Fault
 * Size Strength classification
 * Skaergaard intrusion
 * Skaergaardite
 * Skania
 * Skarn
 * Skiddaw Slate
 * Skolithos
 * Skutterudite
 * Slab (geology)
 * Slab pull
 * Slab suction
 * Slab window
 * Slaking (geology)
 * Slate
 * Slate Islands (Ontario)
 * Slave Point Formation
 * Slave craton
 * Slide Mountain Ocean
 * Slide Mountain Terrane
 * Slimonia
 * Slope-former
 * Slope mining
 * Slope stability
 * Slot canyon
 * Slow earthquake
 * Slump (geology)
 * Slyne-Erris Trough
 * Small shelly fauna
 * Small shelly fossil
 * Smaltite
 * Smartville Block
 * Smilodon californicus
 * Smilodontini
 * Smithsonite
 * Smoky Group
 * Smoky Hill Chalk
 * Snake Ridge Formation
 * Snow cornice
 * Snowball Earth
 * Soapstone
 * Soapstone Ridge
 * Sobolev crater
 * Sociedade Brasileira de Geologia
 * Society for Sedimentary Geology
 * Society hotspot
 * Society of Economic Geologists
 * Society of Exploration Geophysicists
 * Soddyite
 * Soil
 * Soil liquefaction
 * Soil science
 * Sole markings
 * Soledad Beds
 * Solifluction
 * Solnhofen Plattenkalk
 * Solomon Sea Plate
 * Solonchak
 * Solonetz
 * Solvus
 * Somali Plate
 * Somoholitaceae
 * Somoholitidae
 * Songlingornis
 * Songzia
 * Sonidosaurus
 * Sonomia Terrane
 * Sonorasaurus
 * Sophiornithidae
 * Sorbas basin
 * Soroavisaurus australis
 * Sorong Fault
 * Sorting (sediment)
 * Sossusvlei
 * Source rock
 * South American Plate
 * South China (continent)
 * South Downs
 * South Florida rocklands
 * South Tasman Rise
 * Southern Alps (geology)
 * Southerndown
 * Sovanco Fracture Zone
 * Spacecraft Planet Instrument C-matrix Events
 * Sparagmite
 * Spathobathis
 * Specific storage
 * Spectral acceleration
 * Speeton Clay
 * Speleogenesis
 * Speleology
 * Speleoseismite
 * Speleothem
 * Spenceley Glacier
 * Spencer G. Lucas
 * Sperrylite
 * Sphaerocobaltite
 * Sphenocephalus
 * Sphenodiscus
 * Spherical harmonics
 * Spherocobaltite
 * Spheroidal weathering
 * Spider crater
 * Spiegeleisen
 * Spilite
 * Spinostropheus
 * Spiriferina
 * Spirit River Formation
 * Spirolegoceratidae
 * Sporadoceratidae
 * Sporadoceratinae
 * Sporinite
 * Spring (hydrology)
 * Spurrite
 * St. Genevieve marble
 * St. Helena hotspot
 * St. Louis Limestone
 * St. Marks Formation
 * St. Mary's Islands (Karnataka)
 * St. Michael's Cave
 * St. Peter Sandstone
 * St Cuthbert's Swallet
 * Stack (geology)
 * Stacking velocity
 * Stage (hydrology)
 * Stage (stratigraphy)
 * Stalactite
 * Stalagmite
 * Stanley Bowie
 * Stannite
 * Statenville Formation
 * Statherian
 * Station Stones
 * Stauranderaster
 * Staurolite
 * Ste. Genevieve Limestone
 * Steacyite
 * Steamboat Springs, Nevada
 * Steen River crater
 * Stegolophodon
 * Stegomastodon
 * Stegosaurides
 * Steinheim crater
 * Stellerite
 * Stem group
 * Stemflow
 * Stenaster
 * Steneofiber
 * Stenian
 * Stenolaphyritidae
 * Stenomylus
 * Stenopelix
 * Stephanite
 * Stephanitidae
 * Stephanoceras
 * Stephen E. Haggerty
 * Stephen Formation
 * Stephen Hislop
 * Stephenson Glacier
 * Steppe mammoth
 * Stereosaurus
 * Sterling Hill Mining Museum
 * Stibiopalladinite
 * Stilleite
 * Stillwater igneous complex
 * Stillwaterite
 * Stillwellite-(Ce)
 * Stishovite
 * Stockton Arch
 * Stockton Formation
 * Stockwork
 * Stoddart Group
 * Stoke Lane Slocker
 * Stokesosaurus
 * Stolzite
 * Stone Forest
 * Stonebarrow
 * Stonewall Formation
 * Stony Mountain Formation
 * Stoping
 * Storegga Slide
 * Storey Glacier
 * Stormberg Group
 * Stormbergia
 * Storrs L. Olson
 * Straight Cliffs Formation
 * Strand plain
 * Strangways crater
 * Stratigraphic column
 * Stratigraphic section
 * Stratigraphy
 * Stratodus
 * Stratospheric sulfate aerosols (geoengineering)
 * Stratovolcano
 * Stratum
 * Stream
 * Stream bed
 * Stream capacity
 * Stream power
 * Strengite
 * Strepsodiscus
 * Streptospondylus
 * Strewn field
 * Striation (geology)
 * Striatolamia
 * Strike-slip tectonics
 * Strike and dip
 * Stromatoporoidea
 * Strombolian eruption
 * Stromeyerite
 * Strontianite
 * Structural basin
 * Structural geology
 * Structure of the Earth
 * Strunius
 * Stuart Olof Agrell
 * Stuart Ross Taylor
 * Studenitsite
 * Studtite
 * Sturzstrom
 * Stylemys
 * Stylinodon
 * Stylolite
 * Stylonurina
 * Stützite
 * Suavjärvi crater
 * Subaerial
 * Subantarctic
 * Subaqueous fan
 * Subaqueous volcano
 * Subashi Formation
 * Subcontinent
 * Subduction
 * Subglacial eruption
 * Subglacial lake
 * Subglacial volcano
 * Submarine canyon
 * Submarine earthquake
 * Submarine eruption
 * Submarine groundwater discharge
 * Submarine landslide
 * Submarine volcano
 * Submerged continent
 * Subsidence crater
 * Subsolvus
 * Substorm
 * Succession (geology)
 * Succinodon
 * Suchosaurus
 * Sudbury Basin
 * Sudbury Igneous Complex
 * Sudeticeratidae
 * Sue Hendrickson
 * Sue Tyler Friedman Medal
 * Suessite
 * Suevite
 * Suffosion
 * Sugilite
 * Sugiyamasaurus
 * Suining Formation
 * Sulaiman Mountains
 * Sulaimanisaurus
 * Sulcus (geology)
 * Sulfarsenide mineral
 * Sulfate minerals
 * Sulfide minerals
 * Sulfosalt minerals
 * Sulphur Spring
 * Summerville Formation
 * Summit (topography)
 * Summit Creek Formation
 * Sunda Arc
 * Sunda Plate
 * Sunda megathrust
 * Sundance Formation
 * Sundance Sea
 * Sundays River Formation
 * Sunjiawan Formation
 * Sunstone (medieval)
 * Suntar Series
 * Supercontinent
 * Supercontinent cycle
 * Superficial deposits
 * Supergene (geology)
 * Superior Shoal
 * Superior craton
 * Superocean
 * Supersequence
 * Supervolcano
 * Supracrustal
 * Supracrustal rock
 * Surenitidae
 * Surface exposure dating
 * Surface water
 * Surficial aquifer
 * Suspended load
 * Sussex Marble
 * Sutter's Mill meteorite
 * Suture (geology)
 * Suvasvesi
 * Suwannee Limestone
 * Suzhousaurus
 * Svanbergite
 * Swartpuntia
 * Swazian
 * Sweet Home Mine
 * Sweet crude oil
 * Sweetite
 * Swift Creek Landslide
 * Swildon's Hole
 * Switzerite
 * Sydney Basin
 * Syed Mahmood Naqvi
 * Sygambritinae
 * Sylacauga (meteorite)
 * Sylvanite
 * Symplectite
 * Syncline
 * Syndyoceras
 * Syneclise
 * Syneresis cracks
 * Synthetic seismogram
 * Synthetoceras
 * Syrian camel
 * Syrt
 * System (stratigraphy)
 * Szechuanoraptor
 * Szechuanosaurus
 * Sânpetru Formation
 * Sääksjärvi
 * Söderfjärden
 * TM 1517
 * Tabenbulakian
 * Table Mountain Sandstone (Geological Formation)
 * Tabulata
 * Tabun-Khara-Obo crater
 * Taconic Mountains
 * Taconic orogeny
 * Taconite
 * Taeniodont
 * Taenite
 * Tahora Formation
 * Takli Formation
 * Talc carbonate
 * Talemzane crater
 * Talnakhite
 * Tamala limestone
 * Tamarugite
 * Tamayama Formation
 * Tambach Formation
 * Tamiami Formation
 * Tangshan hot springs
 * Tangshang Formation
 * Tangvayosaurus
 * Tanius
 * Tannersville Cranberry Bog
 * Tanohata Formation
 * Tantalite
 * Tantite
 * Tanya Atwater
 * Tapashanitidae
 * Tapinocephalus Assemblage Zone
 * Tapiolite
 * Tar pit
 * Tara Mine
 * Taranakite
 * Tarascosaurus
 * Tarchia
 * TaskForceMajella
 * Tasmanite
 * Tatisaurus
 * Taveirosaurus
 * Taynton Limestone Formation
 * Tazukawa Formation
 * Te Pou Hawaiki
 * Tea table
 * Tealliocaris
 * Teallite
 * Tecovas Formation
 * Tectonic subsidence
 * Tectonic uplift
 * Tectonics
 * Tectonics of the Tian Shan
 * Tectonite
 * Tectonophysics
 * Tectonophysics (journal)
 * Tectonostratigraphy
 * Tees-Exe line
 * Tegana Formation
 * Tehuelchesaurus
 * Teilhardina magnoliana
 * Teinurosaurus
 * Tejas sequence
 * Tektite
 * Telalginite
 * Telegeodynamics
 * Telegraph Creek Formation
 * Teleoceras
 * Teleseism
 * Teletsunami
 * Telicomys
 * Tellus B
 * Telmatornis
 * Telmatosaurus
 * Telychian
 * Temagami Magnetic Anomaly
 * Temagami greenstone belt
 * Temagamite
 * Tempestite
 * Tempo – Sixmilecross Fault
 * Tenacity (mineralogy)
 * Tendaguria
 * Tendaguru Formation
 * Tenebrescence
 * Tenglong Cave
 * Tenham (meteorite)
 * Tennantite
 * Tennessee marble
 * Tenontosaurus
 * Tenoumer crater
 * Tensiometer (soil science)
 * Tension (geology)
 * Tentaculites
 * Tentaculites oswegoensis
 * Tephrochronology
 * Tepui
 * Tera Beds
 * Terataspis
 * Terceira Rift
 * Terebrirostra
 * Teresa Maryańska
 * Terminal moraine
 * Ternovka crater
 * Terra rossa (soil)
 * Terrace (geology)
 * Terracette
 * Terrane
 * Tesla Fault
 * Tessellated pavement
 * Tetcho Formation
 * Tethyan Trench
 * Tethys Ocean
 * Tetraceratops
 * Tetrahedrite
 * Teviornis
 * Texture (geology)
 * Teyuwasu
 * Thalassocerataceae
 * Thalassoceratidae
 * Thalassocnus
 * Thalassoleon
 * Thanetian
 * Thaumaptilon
 * Thaumasite
 * The Berkshires
 * The Great Devonian Controversy
 * The Journal of Geology
 * The Murchison Fund
 * The Silver Spade
 * The Spittles
 * The Structure and Distribution of Coral Reefs
 * The Undercliff
 * The Volcano (British Columbia)
 * Thecocoelurus
 * Thecospondylus
 * Theiophytalia
 * Thelodonti
 * Thelodus
 * Thenardite
 * Theodor Wolf
 * Theoretical gravity
 * Theoretical planetology
 * Theosodon
 * Thermochronology
 * Thermokarst
 * Thermoluminescence dating
 * Thermoremanent magnetization
 * Thick-skinned deformation
 * Thin-skinned deformation
 * Thin section
 * Thiviers-Payzac Unit
 * Thoatherium
 * Tholeiitic magma series
 * Tholus
 * Thomas A. Greene
 * Thomas Chrowder Chamberlin
 * Thomas Oldham
 * Thomas R. Holtz, Jr.
 * Thomasclarkite
 * Thomashuxleya
 * Thomsonite
 * Thorianite
 * Thorite
 * Thortveitite
 * Thotobolosaurus
 * Three Forks Group
 * Thrissops
 * Throughflow
 * Thrupe Lane Swallet
 * Thrust fault
 * Thrust tectonics
 * Thulean Plateau
 * Thumbnail (cliff)
 * Thunderegg
 * Thuringite
 * Thursius
 * Thylacosmilus
 * Tianchisaurus
 * Tiaojishan Formation
 * Tibet
 * Tichosteus
 * Tidal bundle
 * Tidal marsh
 * Tielt Formation
 * Tiemannite
 * Tienshanite
 * Tienshanosaurus
 * Tierra Redonda Mountain
 * Tiki Formation
 * Tilgate Formation
 * Tilougguit Formation
 * Tim Patterson
 * Time range of Hexanchiformes species
 * Timeline of evolutionary history of life
 * Timeline of geology
 * Timeline of the development of tectonophysics
 * Timeline of the far future
 * Timeline of the geologic history of the United States
 * Timimus
 * Tin Bider crater
 * Tinaksite
 * Tingamarra
 * Tiouraren Formation
 * Tisza Plate
 * Titanite
 * Titanohyrax
 * Titanoides
 * Titanosaurus
 * Titanotylopus
 * Titanowodginite
 * Tithonian
 * Toarcian
 * Toarcian turnover
 * Tobermorite
 * Tochisaurus
 * Tokosaurus
 * Tollmann's hypothetical bolide
 * Tolypelepidida
 * Tom Segalstad
 * Tommotia
 * Tonalite-Trondhjemite-Granodiorite
 * Tonga Plate
 * Tonga Trench
 * Tonian
 * Tonoloway Formation
 * Tonouchisaurus
 * Tookoonooka crater
 * Toolebuc Formation
 * Tor Ørvig
 * Torbanite
 * Torbernite
 * Torlesse Greywacke
 * Tornieria
 * Tornoceratidae
 * Tornoceratina
 * Tornoceratinae
 * Tornoceratoidea
 * Toronto Magnetic and Meteorological Observatory
 * Torotix
 * Torreya Formation
 * Torridonian
 * Tortonian
 * Totternhoe Stone
 * Touchet Formation
 * Tourmaline
 * Tournaisian
 * Toutunhe Formation
 * Tow Valley Fault
 * Toxicity characteristic leaching procedure
 * Toxodon
 * Toxodontidae
 * Trace element
 * Trace fossil
 * Traces of Catastrophe
 * Trackway
 * Trafalgar Moraine
 * Tranquillityite
 * Trans-Hudson orogeny
 * Transform boundary
 * Transform fault
 * Transition zone (Earth)
 * Transportation (sediment)
 * Transpression
 * Transtension
 * Transvaal Basin
 * Trap rock
 * Traprock mountain
 * Travertine
 * Trefawr Track
 * Tremacebus
 * Tremadocian
 * Tremataspis
 * Tremolite
 * Tremp Formation
 * Tres Hermanos Formation
 * Trevorite
 * Tri-state water dispute
 * Triassic
 * Triassic–Jurassic extinction event
 * Tribrachidium
 * Trichinopoly Group
 * Trichophycus pedum
 * Triconodonta
 * Trigodon
 * Trigoides
 * Trigonias
 * Trigonosaurus
 * Trigonostylops
 * Triisodontidae
 * Trilobite zone
 * Trimble Knob
 * Trimerophytopsida
 * Trimucrodon
 * Trinil 2
 * Trinil tiger
 * Trinity Formation
 * Triple junction
 * Triplite
 * Triploidite
 * Tripod Rock
 * Tristan hotspot
 * Tristychius
 * Trituberculata
 * Troctolite
 * Trogosus
 * Troilite
 * Trona
 * Trondhjemite
 * Tropaeum
 * Tropic Shale Formation
 * Tropical zones
 * Tropidaster
 * Tropidostoma Assemblage Zone
 * Troposphere
 * Trossingen Formation
 * Trou du Diable
 * Trough (geology)
 * Trout River Formation
 * True polar wander
 * Truncated spur
 * Tsaagan
 * Tsagaantsav Svita
 * Tsagantegia
 * Tsintaosaurus
 * Tsuchikurasaurus
 * Tsumcorite
 * Tsumebite
 * Tsunami
 * Tsunami warning system
 * Tswaing crater
 * Tuchengzi Formation
 * Tufa
 * Tuff
 * Tuffeau stone
 * Tuffite
 * Tugulusaurus
 * Tujingzi Formation
 * Tullimonstrum
 * Tumblagooda sandstone
 * Tummalapalle uranium mine
 * Tungsten ore
 * Tungstite
 * Tunguska event
 * Tunnel valley
 * Tuperssuatsiaite
 * Turanoceratops
 * Turbidite
 * Turbidity current
 * Turginskaya Svita
 * Turiasaurus
 * Turkana Grits
 * Turney Ranch Formation
 * Turonian
 * Turquoise
 * Turquoise Pool
 * Turrilitidae
 * Turrilitoidea
 * Tuscarora Formation
 * Tusionite
 * Tuya
 * Tvären
 * Tweed Volcano
 * Twin Buttes
 * Twin Mountains Formation
 * Tylocephale
 * Tylocephalonyx
 * Tyndall stone
 * Type locality (geology)
 * Types of volcanic eruptions
 * Typotheria
 * Tyrolite
 * Tyrrell Sea
 * Tyrrellite
 * Tyrrhenian (stage)
 * Tyto gigantea
 * Tyto pollens
 * Tytoona Cave
 * Tytthostonyx
 * Uarbryichthys
 * Uberaba Formation
 * Udachnaya pipe
 * Uhligella
 * Uhligia
 * Uhligites
 * Uintatheriidae
 * Uintatherium
 * Ukrainian Shield
 * Ulansuhai Formation
 * Ullapool bolide impact
 * Ulrichite
 * Ultra-high-temperature metamorphism
 * Ultramafic rock
 * Ulysses Sherman Grant
 * Umangite
 * Umbetoceras
 * Umiaites
 * Unakite
 * Unaweep Canyon
 * Unconformity
 * Underground mining (soft rock)
 * Underplating
 * Undulose extinction
 * Unduruh Formation
 * Unidade Arranho
 * Unidade Castelhanos Formation
 * Uniformitarianism
 * Unipeltoceras
 * United States Geological Survey
 * Unquillosaurus
 * Unterwarnow
 * Upalite
 * Upheaval Dome
 * Upper Dharmaram Formation
 * Upper Elliot Formation
 * Upper Hirst
 * Upper Karoo Group
 * Upper Karroo Sandstone Formation
 * Upper Maleri Formation
 * Upper Silesian Coal Basin
 * Upper plane bed
 * Upward continuation
 * Uquian
 * Ur (continent)
 * Ural Ocean
 * Uralian orogenic belt
 * Uralian orogeny
 * Uraninite
 * Uranium-lead dating
 * Uranium mining in Colorado
 * Uranium mining in Utah
 * Uranium mining in Wyoming
 * Uranium mining in the United States
 * Uranium ore
 * Uranocircite
 * Uranophane
 * Uranopilite
 * Ureilite
 * Ust’ Pinega Formation
 * Utica Shale
 * Uzbekbaatar
 * VAN method
 * Vaalbara
 * Vaasa granite
 * Vaesite
 * Vahsel Glacier
 * Valais Ocean
 * Valanginian
 * Valdoraptor
 * Valdosaurus
 * Vale of Clwyd
 * Valenticarbo
 * Valentine Ball
 * Valle de Angeles Redbeds
 * Vallesian
 * Valley
 * Valtos Sandstone Formation
 * Vanadinite
 * Vanadiocarpholite
 * Vanguard Formation
 * Vantasselite
 * Vanuralite
 * Vaqueros Formation
 * Vargeão Dome
 * Variraptor
 * Variscan orogeny
 * Varve
 * Vauxite
 * Veatchite
 * Vectis Formation
 * Veevers crater
 * Vega Formation
 * Vegavis
 * Vegetation and slope stability
 * Veiki moraine
 * Vein (geology)
 * Velafrons
 * Velocipes
 * Velocisaurus
 * Vema Fracture Zone
 * Venaticosuchus
 * Vendia
 * Venenosaurus
 * Vepriai crater
 * Verd antique
 * Vermiculite
 * Vermillion River Formation
 * Verneshot
 * Vertebrate paleontology
 * Vertical displacement
 * Vertical seismic profile
 * Vesicular texture
 * Vestfoldraet
 * Veterupristisaurus
 * Vetulicolidae
 * Vicentino Prestes de Almeida
 * Vichada Structure
 * Victor Efimovich Khain
 * Victor Goldschmidt
 * Victoria Island structure
 * Viewfield crater
 * Viking Formation
 * Villar del Arzobispo Formation
 * Villiaumite
 * Villigen Formation
 * Vincent Courtillot
 * Vine–Matthews–Morley hypothesis
 * Vinita Formation
 * Violarite
 * Virgin River Gorge
 * Viscous remanent magnetization
 * Vista Alegre crater
 * Visual MODFLOW
 * Viséan
 * Vitakridrinda
 * Vitim event
 * Vitrinite
 * Vivianite
 * Vladimirite
 * Vlasovite
 * Volaticotherium
 * Volcanic arc
 * Volcanic ash
 * Volcanic belt
 * Volcanic hazards
 * Volcanic plateau
 * Volcanic rock
 * Volcanism
 * Volcanism of Canada
 * Volcanism of Iceland
 * Volcanism of Indonesia
 * Volcanism of Italy
 * Volcanism of New Zealand
 * Volcanism on Io
 * Volcanism on Mars
 * Volcanism on Venus
 * Volcano
 * Volcano tectonic earthquake
 * Volcanoes of east-central Baja California
 * Volcanology
 * Volkheimeria
 * Volutospina
 * Vorona
 * Voulismeno aloni
 * Vredefort crater
 * Vug
 * Vulcan structure
 * Vulcanian eruption
 * Vulcanodon
 * Vulcanodontidae
 * W. G. Ernst
 * W. Jason Morgan
 * W. Timothy Liu
 * WDC DML 001
 * Wabamun Formation
 * Wabar craters
 * Wackestone
 * Wadati–Benioff zone
 * Wadi Milk Formation
 * Wadsleyite
 * Wagnerite
 * Wahweap Formation
 * Waimanu
 * Wairakite
 * Wairarapa Fault
 * Wairau Fault
 * Wairere Boulders
 * Wakabayashilite
 * Wakefieldite
 * Wakinosaurus
 * Wakulla Springs
 * Wal-Mart camel
 * Walcott-Rust quarry
 * Walfordite
 * Walgettosuchus
 * Walkersaurus
 * Walkomiella
 * Wall rock
 * Walliserops
 * Walter Alvarez
 * Walter C. Pitman, III
 * Walter M. Elsasser
 * Walvis Ridge
 * Wangshi Series
 * Wann Langston, Jr.
 * Wapiti Formation
 * Wapiti Group
 * Wardite
 * Warrior Formation
 * Warwickite
 * Wash load
 * Wassonite
 * Waste Isolation Pilot Plant
 * Watchung Outliers
 * Water contact
 * Water cycle
 * Water gap
 * Water management
 * Water on terrestrial planets
 * Water table
 * Waterfall
 * Watrous Formation
 * Watts Point volcanic centre
 * Wave-cut platform
 * Wave-formed ripple
 * Wave pounding
 * Wax Lake
 * Way up structure
 * Wayan Formation
 * Weald Basin
 * Weald Clay
 * Wealden Supergroup
 * Weald–Artois Anticline
 * Weathering
 * Webb Hill
 * Weddell Plain
 * Weeki Wachee Springs
 * Weeksite
 * Well log
 * Wellington Fault
 * Wellnhoferia
 * Wells Creek crater
 * Weloganite
 * Welsh Borderland Fault System
 * Wem-Bridgemere-Red Rock Fault System
 * Wenlock Series lagerstätte
 * Wenlock epoch
 * Wessex Formation
 * West African craton
 * West Antarctic Rift
 * West Hawk crater
 * West Scotia Basin
 * West Triplet Geyser
 * Westbury Formation
 * Western Canadian Sedimentary Basin
 * Western Ethiopian Shield
 * Western Interior Seaway
 * Westgarth Forster
 * Westmorland Geological Society
 * Weston Observatory (Boston College)
 * Wet gas
 * Wetterstein limestone
 * Wetumpka crater
 * Wheeler Shale
 * Whewellite
 * Whin Sill
 * Whinstone
 * Whipple Mountains
 * Whitby Mudstone Formation
 * White River Ash
 * White Wolf Fault
 * Whitedamp
 * Whiteite
 * Whiterock Stage
 * Whiteschist
 * Whitlockite
 * Whittier Fault
 * Widmerpool Gulf
 * Wilkes Land crater
 * William Alexander Deer
 * William Barton Rogers
 * William Berryman Scott
 * William Borlase
 * William Boyd Dawkins
 * William Buckland
 * William E. Dietrich
 * William Francis Ainsworth
 * William Gregor
 * William H. Schlesinger
 * William J. Sanders
 * William James Kennedy
 * William Johnson Sollas
 * William Morris Davis
 * William Niven
 * William Pengelly
 * William Phipps Blake
 * William Sansom Vaux
 * William Smith (geologist)
 * William Whitehead Watts
 * William Williams Mather
 * Williams Fork Formation
 * Williams Formation
 * Williston Basin
 * Willow Creek Formation
 * Wills Creek Formation
 * Wind River Basin
 * Windermere Supergroup
 * Windermere group
 * Window (geology)
 * Winspit
 * Winston Glacier
 * Winterburn Group
 * Winton Formation
 * Wisconsin glaciation
 * Wissahickon Formation
 * Wissahickon schist
 * Witaaspis
 * Witch's Finger
 * Witherite
 * Witwatersrand Basin
 * Witwatia
 * Wiwaxia
 * Wodginite
 * Wolf Island
 * Wolf von Engelhardt
 * Wolfe Creek Crater
 * Wolfenstein (rock)
 * Wolfgang Franz von Kobell
 * Wolframite
 * Wolfville Formation
 * Women in geology
 * Wonthaggi Formation
 * Woodbend Group
 * Woodbine Formation
 * Woodbury Formation
 * Woodleigh crater
 * Woodville Karst Plain
 * Woodville Karst Plain Project
 * Woodward's Eagle
 * Wordian
 * World Magnetic Model
 * Woyie River (Diamond)
 * Wrangell Volcanic Field
 * Wucaiwan Formation
 * Wuchiapingian
 * Wuerhosaurus
 * Wulagasaurus
 * Wulungo Formation
 * Wunsiedel Marble
 * Wurtzite
 * Wyartite
 * Wyleyia
 * Wyoming craton
 * Wyomingraptor
 * Wyville-Thomson Ridge
 * Wüstite
 * Xalnene Tuff footprints
 * Xenocyon lycaonoides
 * Xenolith
 * Xenomorph (geology)
 * Xenoposeidon
 * Xenosmilus
 * Xenotarsosaurus
 * Xenotime
 * Xenusion
 * Xert Formation
 * Xiagou Formation
 * Xianren Cave
 * Xianshanosaurus
 * Xiaogou Formation
 * Xiaosaurus
 * Xiaoyan Formation
 * Xidazoon
 * Xifengite
 * Xilingolite
 * Xinjiangovenator
 * Xinpongnaobao Formation
 * Xiongguanlong
 * Xixianykus
 * Xixiasaurus
 * Xuanhanosaurus
 * Xuanhuaceratops
 * Xue Feng
 * Xueyu Cave
 * Yacoraite Formation
 * Yamaceratops
 * Yamato 691
 * Yamato 791197
 * Yandangornis
 * Yandusaurus
 * Yantanglestes
 * Yap Trench
 * Yarala
 * Yarnemia
 * Yarrabubba crater
 * Yaverlandia
 * Yellowknife greenstone belt
 * Yellowstone Caldera
 * Yellowstone National Park
 * Yellowstone hotspot
 * Yesnaby Sandstone Group
 * Yevgeny Fyodorov
 * Yevgraf Fyodorov
 * Yezo Group
 * Yibinosaurus
 * Yijinholuo Formation
 * Yilgarn Craton
 * Yilong Cave
 * Yimenosaurus
 * Yingshanosaurus
 * Yixian Formation
 * Yixianornis
 * Yixianosaurus
 * Yoden Village Quarry
 * Yoldia Sea
 * Yonaguni Monument
 * Yongantun Formation
 * Yoredale Series
 * Yorgia
 * Yorktown Formation
 * Younger Dryas impact hypothesis
 * Ypresian
 * Yttrialite
 * Yttrocerite
 * Yuanmousaurus
 * Yuanpu Formation
 * Yukon-Tanana Terrane
 * Yuksporite
 * Yule Marble
 * Yuliangze Formation
 * Yungavolucris
 * Yunnanosaurus
 * Yunxiansaurus
 * Yuri Alexandrovich Popov
 * ZTR index
 * Zabuyelite
 * Zaccagnaite
 * Zagros fold and thrust belt
 * Zairite
 * Zajacite-(Ce)
 * Zalambdalestes
 * Zalmoxes
 * Zanabazar (dinosaur)
 * Zanazziite
 * Zanclean
 * Zanclean flood
 * Zanclodon
 * Zanclodonmergel
 * Zaniolepis
 * Zapadnaya crater
 * Zapalasaurus
 * Zatomus
 * Zealandia (continent)
 * Zechstein
 * Zedekiah's Cave
 * Zeleny Gai crater
 * Zeltornis
 * Zemannite
 * Zenion
 * Zenopsis
 * Zeolite facies
 * Zephyrosaurus
 * Zeunerite
 * Zhamanshin crater
 * Zhejiangosaurus
 * Zhemchug Canyon
 * Zhemchuzhnikovite
 * Zhenzhuchong Formation
 * Zhezhunchong Formation
 * Zhidan Group
 * Zhijin Cave
 * Zhongdong, Ziyun County
 * Zhongyuansaurus
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