List of the Paleozoic life of Kentucky

This list of the Paleozoic life of Kentucky contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of Kentucky and are between 538.8 and 252.17 million years of age.

A

 * †Abatocrinus
 * †Abatocrinus grandis
 * †Abatocrinus steropes
 * †Abatocrinus n. sp. – informal
 * Cladida - Abrotocrinus.JPG †[[Abrotocrinus]]
 * †Abrotocrinus coreyi
 * †Abrotocrinus debrae
 * †Abrotocrinus manus – tentative report
 * †Abrotocrinus springeri
 * †Abrotocrinus unicus
 * †Achatella
 * †Achistrum
 * †Achistrum brownwoodensis
 * †Achistrum ludwigi
 * †Achistrum monochordata
 * †Achistrum nicholsoni
 * †Acidaspis
 * †Acidaspsis
 * †Acinophyllum
 * †Acinophyllum davisi
 * †Aclisina
 * †Aclisina golconda
 * †Acolocrinus
 * †Acolocrinus hydraulicus
 * †Acratia
 * † Acrophyllum
 * †Acrophyllum clarki
 * †Acrophyllum conigerum
 * †Actinoceras
 * †Actinoceras altopontense – type locality for species
 * †Actinoceras kentuckiense – type locality for species
 * Monobathrida - Actinocrinites.JPG †[[Actinocrinites]]
 * †Actinocrinites eximius
 * †Actinocrinites gibsoni
 * †Actinocrinites jugosus
 * †Actinocrinites scitulus
 * †Adinocrinus
 * †Adinocrinus nodosus
 * †Aerocortex
 * †Aerocortex kentuckiensis
 * †Agaricocrinus
 * †Agaricocrinus americanus
 * †Agaricocrinus crassus
 * †Agaricocrinus inflatus – tentative report
 * †Agaricocrinus planoconvexus
 * †Agaricocrinus wortheni – tentative report
 * †Agassizocrinus
 * †Agassizocrinus conicus
 * †Agassizocrinus gibbosua
 * †Agassizocrinus laevis
 * †Agassizocrinus lobatus
 * †Ahrensisporites
 * †Ahrensisporites guerickei
 * †Alaskadiscus
 * †Alaskadiscus magnus
 * †Alaskadiscus subacutus
 * †Alastega
 * †Alastega martini – type locality for species
 * Alethopteris PAMuseum.jpg †[[Alethopteris]]
 * †Alethopteris decurrens
 * †Alethopteris lonchitica – or unidentified comparable form
 * †Allonychia
 * †Allonychia flanaganensis
 * †Alloprosallocrinus
 * †Alloprosallocrinus conicus
 * †Allorisma
 * †Allosaccus
 * †Allumettoceras
 * †Allumettoceras tenerum – or unidentified comparable form
 * †Alveolites
 * †Alveolites asperus
 * †Alveolites constans
 * †Alveolites expatiatus
 * †Alveolites fibrosus
 * †Alveolites goldfussi
 * †Alveolites labrosus
 * †Alveolites louisvillensis
 * †Alveolites minimus
 * †Alveolites mordax
 * †Alveolites squamosus
 * †Alveolites undosus
 * †Alveolites winchellana
 * †Amaurotoma
 * †Amaurotoma leavenworthana
 * †Amblytochiton
 * †Amblytochiton incomptus – type locality for species
 * †Ambochia
 * †Ambonychia
 * †Ambonychia byrnesi
 * †Ambonychia ulrichi – or unidentified comparable form
 * †Ammonellipsites
 * †Amphiscapha
 * †Amphiscapha catilloides
 * †Amphissites
 * †Amphissites centronotoides
 * †Amphissites mimicus
 * †Amphissites planoventralis
 * †Amphissites vanniae
 * †Amphoracrinus
 * †Amplexizaphrentis
 * †Amplexizaphrentis compressus
 * †Amplexizaphrentis spinulosus
 * Amplexopora Trypanites section.jpg †[[Amplexopora]]
 * †Amplexopora minnesotensis
 * †Amplexopora minor
 * †Amplexopora persimilis
 * †Amplexopora winchelli – or unidentified comparable form
 * †Amplexus
 * †Amplexus fragilis
 * †Amygdalocystites
 * †Amygdalocystites fiorealis
 * †Anapiculatisporites
 * †Anapiculatisporites minor
 * †Anastrophia – tentative report
 * †Anazyga
 * †Anazyga recurvirostra
 * †Anchiopella
 * †Anchiopella anchiops
 * †Anematina
 * †Anematina proutana
 * † Anisophyllum
 * †Anisophyllum trifurcatum
 * †Anisophyllum unilargum – tentative report
 * †Ankyropteris
 * †Ankyropteris brongniartii
 * Annularia Stellata.jpg †[[Annularia]]
 * †Annularia galioides
 * †Anomalocrinus
 * †Anomalodonta
 * †Anomalodonta gigantea
 * †Aorocrinus
 * †Aorocrinus nodulus – type locality for species
 * †Aparchites
 * †Aparchites minutissimus
 * †Apiculatasporites
 * †Apiculatasporites variocorneus
 * †Apodasmocrinus
 * †Apodasmocrinus punctatus
 * †Aptochilina
 * †Arabellites
 * †Arabellites cornutus
 * †Arachnophyllum
 * †Arachnophyllum mamillare
 * †Arachnophyllum mammillare
 * †Arachnophyllum pentagonum – type locality for species
 * †Arachnophyllum quadrangulare
 * †Arachnophyllum separatum
 * †Arachnophyllum sinemurum – type locality for species
 * †Arachnophyllum striatum
 * Archaeocidaris brownwoodensis MHNT.jpg †[[Archaeocidaris]]
 * †Archaeocidaris norwoodi
 * †Archaeocrinus
 * †Archaeocrinus peculiaris
 * †Archaeopitys
 * †Archaeopitys eastmanii
 * †Archaeopteris
 * †Archaeopteris eastmanii
 * Fenestellidae - Archimedes species.JPG]] †Archimedes''
 * †Archimedes communis
 * †Archimedes compactus
 * †Archimedes confertus
 * †Archimedes distans
 * †Archimedes invaginatus
 * †Archimedes lativolvis
 * †Archimedes macfarlani
 * †Archimedes meekanoides
 * †Archimedes meekanus
 * †Archimedes proutanus
 * †Archimedes sublaxus
 * †Archimedes swallowvanus
 * †Archimedes terebriformis
 * †Archinacella
 * †Archinacella simulatrix
 * †Arnoldella
 * †Arnoldella minuta
 * †Arthraria
 * †Arthraria rogersensis
 * †Arthropitys
 * †Arthropitys communis
 * †Arthroxylon
 * †Asolanus
 * †Aspidopora
 * †Aspidopora newberryi
 * †Astarella
 * †Astartella – tentative report
 * †Astartella concentrica
 * Asteracanthus ornatissimus teeth Tubingen.JPG †[[Asteracanthus]]
 * †Asteracanthus siderius – type locality for species
 * †Asterophyllites
 * †Asterophyllites charaeformis
 * †Asterophyllites longifolius
 * †Asthenophyllum
 * †Asthenophyllum davisi – type locality for species
 * †Asthenophyllum scitulum – tentative report
 * †Astrocerium
 * †Astrocerium hisingeri
 * †Astrocerium niagarense
 * †Astrocerium venustum
 * †Atactopora
 * †Atactoporella
 * †Atactoporella newportensis
 * †Atelestocrinus
 * †Atelestocrinus kentuckyensis – type locality for species
 * †Athyris
 * †Athyris fultonensis
 * Atrypa reticularis pedunculate Gondelsheim CRF.jpg †[[Atrypa]]
 * †Augustoceras
 * †Augustoceras shideleri – type locality for species
 * †Aulacera
 * †Aulacera cylindrica
 * †Aulacera intermedia
 * †Aulacera nodulifera
 * †Aulacera plummeri
 * †Aulocrinus
 * †Aulocrinus bellus
 * †Aulocystis
 * †Aulocystis auloporoidea
 * †Aulocystis jacksoni
 * †Aulocystis procumbens – tentative report
 * †Aulocystis transitorius – type locality for species
 * AuloporaDevonianSilicaShale.jpg †[[Aulopora]]
 * †Aulopora precius
 * †Aulopora pygmaea – tentative report
 * †Aulopora tubiporoides
 * †Australosutura
 * †Aviculopecten
 * †Aviculopecten germanus – or unidentified related form

B

 * Bairdia
 * †Bairdia salemensis
 * †Balticopora
 * †Balticopora tenuimurale
 * †Barycrinus
 * †Barycrinus asteriscus – or unidentified related form
 * †Barycrinus cornutus
 * †Barycrinus rhombiferus
 * †Barycrinus sculptilis
 * †Barycrinus sculptus
 * †Barycrinus spurius
 * †Barycrinus stellatus
 * †Barycrinus tumidus
 * †Batherocystis
 * †Batherocystis appressa
 * †Bathyurus
 * †Bathyurus ingalli – or unidentified comparable form
 * †Batocrinus
 * †Batocrinus calyculus
 * †Batocrinus icosodactylus
 * †Batocrinus spergenensis
 * †Batostoma
 * †Batostoma humile – or unidentified comparable form
 * †Batostomella
 * †Batostomella gracilis
 * †Beecheria
 * †Beecheria formosa – tentative report
 * †Belemnospongia
 * †Belemnospongia parmula
 * Bellerophon umbilicalis.jpg †[[Bellerophon (genus)|Bellerophon]]
 * †Beloitoceras
 * †Beloitoceras huronense – or unidentified comparable form
 * †Benthanyphyllum
 * †Benthanyphyllum prateriforme
 * †Benthanyphyllum robustum
 * Berenicea
 * †Beyrichia
 * †Beyrichia chambersi
 * †Beyrichoceras
 * †Billingsastraea
 * †Billingsastraea yandelli
 * †Billingsocystis
 * †Billingsocystis invaginata
 * †Bisatoceras – tentative report
 * †Blairocrinus
 * †Blairocrinus protuberatus – type locality for species
 * †Blothrocrinus
 * †Blothrocrinus swallovi
 * †Blothrophyllum
 * †Blothrophyllum zaphrentiforme
 * †Bolbopisthia
 * †Bolbopisthia progressa reticulata – or unidentified comparable form
 * †Bollia
 * †Bollia persulcata
 * †Borestus
 * †Bostonia
 * †Bostonia perplexa
 * †Bothrodendron
 * †Bothrodendron minutifolium
 * †Bowmanites
 * †Bowmanites dawsoni
 * †Brachiospongia
 * †Brachiospongia digitata
 * †Brachymetopus
 * †Brachythyris
 * †Brachythyris subcardiformis
 * †Brachythyris suborbicularis
 * †Bucanapsis
 * †Bucania
 * †Bucania halli
 * †Bucania pojetai – type locality for species
 * †Bucania rugatina
 * †Bucania subangulata
 * †Bucania sublata
 * †Bucanopsis
 * †Bucanopsis carinifera
 * †Bucanopsis diabloensis
 * †Bulimorpha
 * †Bulimorpha bulimiformis
 * †Bulimorpha elongata
 * Trilobite - Bumastus reconstruction 3d.jpg †[[Bumastus]]
 * †Byssonychia
 * †Byssonychia radiata
 * †Byssonychia richmondensis
 * Bythocypris
 * †Bythocypris cylindrica
 * †Bythocypris lydeae

C

 * Calamites stems.JPG †[[Calamites]]
 * †Calamites cistii
 * †Calamites undulatus
 * †Calamocarpon
 * †Calamocarpon insignis
 * †Calamopitys
 * †Calamopitys americana
 * †Calamopitys foerstei
 * †Calamopteris
 * †Calamopteris hippocrepis
 * †Calamoptys
 * †Calamoptys foerstei
 * †Calamospora
 * †Calamospora hartungiana
 * †Calamostachys
 * †Calamostachys binneyana
 * †Calapoecia
 * †Calapoecia huronensis
 * Callixylon whiteanum.jpg †[[Callixylon]]
 * †Callixylon brownii
 * †Calopora
 * †Calopora ramosa
 * †Calostylis
 * †Calostylis lindstroemi
 * †Calostylis spongiosa
 * †Calyptaulax
 * †Calyptaulax strasburgensis – or unidentified comparable form
 * †Camarotoechia
 * †Camarotoechia mutata
 * †Camerella
 * †Camerella immatura – or unidentified related form
 * Cameroceras inaequabile fossil nautiloid, northern Kentucky.jpg †[[Cameroceras]]
 * †Cameroceras rowenaense – type locality for species
 * †Cameroceras trentonense – or unidentified comparable form
 * †Camptocrinus
 * †Camptocrinus crawfordsvillensis
 * †Camptocrinus nudus
 * †Canadocystis
 * †Canadocystis tennesseensis
 * †Cantabricanites – tentative report
 * †Cantabricanites greenei
 * †Carabocrinus
 * †Carabocrinus micropunctatus
 * †Carabocrinus plate – informal
 * †Carinaropsis
 * †Carinaropsis cymbula
 * †Carinaropsis explanata – type locality for species
 * †Carinaropsis minima
 * †Cartersoceras
 * †Cartersoceras popei – type locality for species
 * †Cartersoceras shideleri
 * †Catillocrinus
 * †Catillocrinus tennesseeae
 * †Cavellina
 * †Ceramophylla
 * †Ceramophylla alternatum
 * †Ceramoporella
 * †Cerartoleperditia
 * †Cerartoleperditia kentuckyensis
 * †Ceratopsis
 * †Ceratopsis chambersi
 * †Ceratopsis intemedia
 * †Ceratopsis intermedia
 * †Ceratopsis oculifera – or unidentified related form
 * Ceraurus fossil cropped.png †[[Ceraurus]]
 * †Cestocrinus – tentative report
 * †Chasmatopora
 * †Cheirocystis
 * †Cheirocystis fultonensis – type locality for species
 * †Chonetes
 * †Cincinnaticrinus
 * †Cincinnaticrinus varibrachialis
 * †Cincinnetina
 * †Cincinnetina meeki
 * †Cincinnetina multisecta
 * †Cladochonus
 * †Cladochonus beecheri
 * †Cladochonus crassus
 * †Cladopora
 * †Cladopora aculeata
 * †Cladopora acupicta
 * †Cladopora bifura
 * †Cladopora gulielmi
 * †Cladopora imbricata
 * †Cladopora menis – tentative report
 * †Cladopora ordinata
 * †Cladopora reticulata
 * †Cladoxylon
 * †Clathrospira
 * †Clathrospira conica
 * †Clathrospira subconica
 * †Claudeonychia – tentative report
 * †Claudeonychia byrnesi
 * †Cleionychia
 * Cleiothyridina sublamellosa pedunculate valve.jpg †[[Cleiothyridina]]
 * †Cleiothyridina hirsuta
 * †Cleiothyridina sublamellosa
 * †Clepsydropsis
 * †Clepsydropsis bertrandi
 * †Clepsydropsis campbelli
 * †Clepsydropsis chaneyi
 * †Clepsydropsis titan
 * †Climacograptus
 * †Climacograptus putillus
 * †Clinopistha
 * †Clinopistha radiata
 * †Codaster
 * †Codaster jessieae
 * †Coeliocrinus
 * †Coeliocrinus subspinosus
 * †Coenites
 * †Coenites verticillatus
 * †Colaptomena
 * †Colpomya
 * †Colpomya constricta
 * †Colpomya faba
 * Compositafossil.jpg †[[Composita]]
 * †Composita subquadrata
 * †Composita trinuclea
 * †Conostoma
 * †Conostoma anglogermanicum
 * †Conostoma oblongum
 * †Constellaria
 * †Constellaria florida – or unidentified comparable form
 * †Constellaria teres
 * †Conularia
 * †Conularia formosa
 * †Conularia trentonensis
 * †Convolutispora
 * †Coopericystis
 * †Coopericystis pyriformis
 * †Cordaites
 * †Cordaites felicis
 * Cornulites cellulosus.jpg †[[Cornulites]]
 * †Coronocystis
 * †Coronocystis angulatus
 * †Cosmetocrinus
 * †Cosmetocrinus gracilis
 * †Costalocrinus
 * †Costalocrinus conkini – type locality for species
 * †Costalocrinus cornutus
 * †Costalocrinus rex
 * †Costatulites
 * †Costatulites richmondensis
 * †Crania – tentative report
 * †Craniops
 * †Craniops cincinnatiensis
 * †Crassispora
 * †Crassispora kosankei
 * †Craterophyllum
 * †Craterophyllum adnascens
 * †Craterophyllum invaginatum
 * †Craterophyllum solitarium
 * †Cryptolithus
 * †Cryptolithus bellulus
 * †Cryptolithus recurvus
 * †Cryptolithus tesselatus
 * †Ctenobolbina
 * †Ctenobolbina ciliata
 * †Ctenodonta
 * †Ctenodonta logani – or unidentified related form
 * †Ctenodonta longa – or unidentified related form
 * †Ctenodonta nasuta – or unidentified comparable form
 * †Ctenodonta obliqua
 * †Ctenodonta regia
 * †Ctenodonta socialis
 * †Cuffeyella
 * †Cuffeyella arachnoidea
 * †Culmicrinus
 * †Culmicrinus verus
 * †Cuneamya
 * †Cupulocrinus
 * †Cyathactis
 * †Cyathactis sedentarius
 * †Cyathactis typus
 * †Cyathaxonia
 * †Cyathaxonia venusta
 * [[File:Cyathocrinites multibrachiatus fossil crinoid (Mississippian; Crawfordsville, Indiana, USA) 2 (17385978065).jpg|thumb|upright=0.3|Fossilized calyx and partial stem of the Silurian-Permian crinoid ("sea lily") Cyathocrinites]] †[[Cyathocrinites]]
 * †Cyathocrinites asperrimus
 * †Cyathocrinites astralus – type locality for species
 * †Cyathocrinites farleyi
 * †Cyathocrinites glenni
 * †Cyathocrinites iowensis
 * †Cyathocrinites kelloggi
 * †Cyathocrinites multibrachiatus
 * †Cyathocrinites nodosus
 * †Cyathocrinites parvibrachiatus
 * †Cyathophylloides
 * †Cybelinidae
 * †Cybelinidae cranidium – informal
 * †Cycloconcha
 * †Cycloconcha milleri
 * †Cycloconcha ovata – or unidentified related form
 * †Cyclocyclopa
 * †Cyclocystoides
 * †Cyclogranisporites
 * †Cyclogranisporites aureus – or unidentified comparable form
 * †Cyclogranisporites minutus
 * †Cyclonema
 * †Cyclonema minuta
 * †Cyclopentagonopa
 * †Cyclora – tentative report
 * †Cydrocrinus
 * †Cydrocrinus concinnus – tentative report
 * †Cydrocrinus subramulosus – tentative report
 * †Cymatonota
 * †Cyphaspis
 * †Cyphotrypa
 * †Cyphotrypa acervulosa
 * †Cyphotrypa clarksvillensis
 * †Cypricardinia
 * †Cypricardinia indianensis
 * †Cyrtina
 * Cyrtoceras NT small.jpg †[[Cyrtoceras]]
 * †Cyrtodonta
 * †Cyrtodonta grandis
 * †Cyrtodonta subovata
 * †Cyrtodontula
 * †Cyrtodontula umbonata
 * †Cyrtolites
 * †Cyrtolites claysferryensis – type locality for species
 * †Cyrtolites inornatum
 * †Cyrtolites ornatus – tentative report
 * †Cyrtolites retrorsus
 * †Cyrtospira
 * †Cyrtospira bicurvata – type locality for species
 * †Cyrtostropha
 * †Cyrtostropha salteri
 * †Cystihalysites
 * †Cystihalysites nexus
 * †Cystiphylloides
 * †Cystiphylloides americanum
 * †Cystiphylloides crassatum
 * †Cystiphyllum
 * †Cystiphyllum granilineatum
 * †Cystiphyllum niagarense
 * †Cystiphyllum spinulosum
 * †Cystodictya
 * †Cystodictya lineata
 * Cytherella

D

 * †Dalejina
 * †Dalmanella
 * †Dalmanella emacerata
 * †Dalmanella fertilis
 * †Dalmanella sulcata
 * †Dalmanophyllum
 * †Dalmanophyllum gainesi
 * †Dalmanophyllum herzeri
 * †Dalmanophyllum linguliferum
 * Decadocrinus crinoid.jpg †[[Decadocrinus]]
 * †Decadocrinus scalaris
 * †Deceptrix
 * †Deceptrix hartsvillensis – or unidentified comparable form
 * †Deceptrix perminuta
 * †Declinognathodus
 * †Declinognathodus delicatus – or unidentified related form
 * †Declinognathodus donetzianus
 * †Declinognathodus marginodosus
 * †Decoroproetus
 * †Decoroproetus parviusculus
 * †Deiroceras
 * †Deiroceras curdsvillense
 * †Dekayia
 * †Deliablastus
 * †Deliablastus cumberlandensis
 * †Deltoidospora
 * †Deltoidospora priddyi
 * †Densosporites
 * †Densosporites annulatus
 * †Densosporites glandulosus
 * †Densosporites sphaerotriangularis
 * †Dentiblastus
 * †Diabolocrinus
 * †Diabolocrinus vesperalis
 * †Dichocrinus
 * †Dichocrinus ficus – tentative report
 * †Dichocrinus gracilis
 * †Dichocrinus pocillum – tentative report
 * †Dichocrinus simplex
 * †Dichocrinus ulrichi
 * †Dictyophlois
 * †Dictyophlois reticulata
 * †Dictyotomaria
 * †Dictyotomaria nyi
 * †Dictyotriletes
 * †Dictyotriletes bireticulatus
 * †Dielasma
 * †Dielasma formosa
 * †Diestoceras
 * †Diestoceras indianense
 * †Diichnia
 * †Diichnia kentuckiensis
 * †Dilobella
 * †Dimegelasma
 * †Dimorphoceratoides
 * †Dimorphoceratoides adamsi – type locality for species
 * †Dinophyllum
 * †Dinophyllum hoskinsoni
 * †Dinophyllum stokesi
 * †Dinorthis
 * †Dinorthis pectinella
 * †Diorychopora
 * †Diorychopora tenuis
 * †Diploblastus
 * Diplograptus simplex.png †[[Diplograptus]]
 * †Disphyllum
 * †Disphyllum synaptophylloides
 * †Dizygocrinus
 * †Dizygocrinus biturbinatus
 * †Dizygocrinus montgomeryensis
 * †Dizygocrinus whitei
 * †Doleroides
 * †Dolichoharpes
 * †Donaldina
 * †Donaldina zadoe
 * †Dorycrinus
 * †Dorycrinus gouldi
 * †Dorycrinus quinquelobus
 * †Drymopora
 * †Drymopora fascicularis
 * †Dzhaprakoceras
 * †Dzhaprakoceras brodheadense – type locality for species

E

 * †Ectenocrinus
 * †Ectenocrinus simplex
 * †Edaphophyllum
 * †Edaphophyllum laciniatum – tentative report
 * †Edmondia
 * †Edrioaster
 * †Edrioaster bigsbyi
 * †Edrioaster priscus
 * †Emmonsia
 * †Emmonsia amplissima
 * †Emmonsia arbuscula
 * †Emmonsia bacula
 * †Emmonsia convexa
 * †Emmonsia emmonsi
 * †Emmonsia epidermata
 * †Emmonsia epidermi
 * †Emmonsia eximia
 * †Emmonsia radiciformis
 * †Emmonsia ramosa
 * †Emmonsia tuberosa
 * Endoceras.JPG †[[Endoceras]]
 * †Endoceras proteiformis
 * †Endothyra
 * †Endothyra baileyi
 * †Endothyranella
 * †Endothyranella inflata
 * †Endothyranella kentuckyensis
 * †Enoploura
 * †Enoploura punctata – or unidentified comparable form
 * †Entelophyllum
 * †Entelophyllum eruciforme
 * †Entelophyllum rugosum
 * †Entelophyllum strictum
 * Eocaudina
 * †Eocaudina gutschicki
 * †Eocaudina mccormacki
 * †Eochonetes
 * †Eochonetes clarksvillensis
 * †Eoleperditia
 * †Eoleperditia catheysensis – or unidentified comparable form
 * †Eoleperditia fabulites
 * †Eolissochonetes
 * †Eolissochonetes morsei
 * †Eopteria
 * †Eopteria conocardiformis
 * †Eospirifer
 * †Eotomaria
 * †Ephippioceras
 * †Ephippioceras ferratum
 * Equisetopsida.jpg †[[Equisetum]]
 * †Equisetum arvense
 * †Eratacrinus
 * †Eratacrinus coxanus
 * †Eremopteris
 * †Eremopteris gracilis
 * †Eretmocrinus
 * †Eretmocrinus cloelia
 * †Eretmocrinus magnificus
 * †Eretmocrinus ramulosus
 * †Eretmocrinus yandelli
 * †Eridophyllum
 * †Eridophyllum archiaci
 * †Eridophyllum coagulatum
 * †Eridophyllum seriale
 * †Eridophyllum tumidulum
 * †Eridopora
 * †Eridorthis
 * †Eridorthis nicklesi
 * †Eridotrypa
 * †Eridotrypa briareus – or unidentified comparable form
 * †Eridotrypa mutabilis
 * †Escharopora
 * †Escharopora falciformis
 * †Escharopora hilli
 * †Escharopora nodulosa – or unidentified comparable form
 * †Etheridgella
 * †Etheridgella biconvexa – type locality for species
 * †Eucladocrinus
 * †Eucladocrinus millebrachiatus
 * †Euconospira
 * †Euconospira conula
 * †Eumetria
 * †Eumetria marcyi
 * †Eumetria vera
 * †Eumetria verneuiliana
 * †Eumetria verneuliana
 * †Eunema
 * †Eunema centralis
 * †Eunema helicteres
 * †Eunicites
 * †Eupachycrinus
 * †Eupachycrinus germanus
 * †Eupachycrinus spartarius
 * †Euphemites
 * †Euphemites randolphensis
 * †Euryocrinus
 * †Euryocrinus tennesseensis

F

 * †Favistella
 * †Favistella alveolata
 * †Favistina
 * †Favistina stellata
 * FavositesOrdovicianIndiana.jpg †[[Favosites]]
 * †Favosites arbor
 * †Favosites biloculi
 * †Favosites clausus
 * †Favosites delandi
 * †Favosites densitabulatus
 * †Favosites discoideus
 * †Favosites discus
 * †Favosites divergens
 * †Favosites favosus
 * †Favosites hamiltoniae
 * †Favosites hisingeri
 * †Favosites niagarensis
 * †Favosites placenta
 * †Favosites proximatus
 * †Favosites quercus
 * †Favosites rotundituba
 * †Favosites turbinatus
 * †Fenestella
 * †Fenestella multispinosa
 * †Fenestella rudis
 * †Fenestella serratula
 * †Fimbrispirifer
 * †Fimbrispirifer venustus
 * †Fistulipora
 * †Fistulipora incrustans
 * †Fistulipora perdensa
 * †Fistulipora spergenensis
 * Flexicalymene-ouzregui-rolled.jpg †[[Flexicalymene]]
 * †Flexicalymene granulosa
 * †Flexicalymene griphus
 * †Flexicalymene meeki
 * †Florinites
 * †Florinites mediapudens
 * †Foerstephyllum
 * †Foerstephyllum vacuum
 * †Foerstia
 * †Foerstia ohioensis
 * †Follotites 
 * †Follotites bighillensis – type locality for species
 * Sagenocrinida - Forbesiocrinus.JPG †[[Forbesiocrinus]]
 * †Forbesiocrinus multibrachiatus
 * †Forbesiocrinus wortheni
 * †Forbesiocrinus wortheri
 * †Furcitella
 * †Furcitella scofieldi – or unidentified comparable form
 * †Fusispira
 * †Fusispira sulcata

G

 * †Galtiera
 * †Galtiera bostonensis
 * †Gastrioceras
 * †Gastrioceras magoffinense – type locality for species
 * †Gaulocrinus
 * †Gaulocrinus bordeni
 * †Gaulocrinus symmetros – type locality for species
 * †Gaulocrinus trantscholdi
 * †Gaulocrinus veryi
 * †Geniculograptus
 * †Geniculograptus typicalis
 * Rhodocrinidae - Gilbertsocrinus tuberosus.JPG †[[Gilbertsocrinus]]
 * †Gilbertsocrinus tuberculosus – tentative report
 * †Gilbertsocrinus tuberosus
 * †Gilbertsocrinus typus – tentative report
 * †Girtyella
 * †Girtyella brevilobata
 * †Girtyella turgida
 * †Glabrocingulum
 * †Glabrocingulum ellenae – type locality for species
 * †Globozyga
 * †Globozyga littonana
 * †Globulocystites
 * †Glossina
 * †Glossina nebraskensis
 * Glyptocrinidae - Glyptocrinus decadactylus cropped.jpg †[[Glyptocrinus]]
 * †Glyptocrinus nodosus
 * †Glyptopleura
 * †Glyptopleura parvacostata
 * †Glyptopleura perbella
 * †Glyptopora
 * †Glyptopora sagenella
 * †Glyptorthis
 * †Glyptorthis insculpta
 * †Gnathodus
 * †Gnathodus bulbosus
 * †Gnathodus pseudosemiglaber
 * †Gnathodus semiglaber
 * †Gnathodus texanus
 * Goniatitidae - Goniatites species.JPG †[[Goniatites]]
 * †Goniocyclus
 * †Gorbyoceras
 * †Gorbyoceras tetreauense – or unidentified comparable form
 * †Gordonaster
 * †Gordonaster brassfieldensis
 * †Gosseletina
 * †Gosseletina johnsoni
 * †Gosseletina subglobosa
 * †Grammysia – tentative report
 * †Granasporites
 * †Granasporites medius
 * †Granatocrinus
 * †Granatocrinus granulatus
 * †Granulatisporites
 * †Granulatisporites granularis
 * †Granulatisporites granulatus
 * †Granulatisporites pallidus
 * †Granulatisporites verrucosus
 * †Graptodictya
 * †Gravicalymene
 * †Gravicalymene hagani
 * †Grewingikia
 * †Grewingikia rustica
 * RugosaOrdovician.jpg †[[Grewingkia]]
 * †Grewingkia rusticum
 * †Grumosisporites
 * †Grumosisporites varioreticulatus
 * †Gyronema
 * †Gyronema pulchellum

H
†Hyolithes
 * †Hadroblastus
 * †Hallia
 * †Hallia strigata – tentative report
 * Hallopora multitabulata fossil bryozoan (Ordovician; Frankfort IL.jpg Bryozoa_Hallopora1.jpg]] †[[Hallopora]]''
 * †Hallopora multitabulata
 * †Hallopora onealli
 * †Halysiocrinus
 * †Halysiocrinus cumberlandensis
 * †Halysiocrinus dactylus
 * †Halysiocrinus tunicatus
 * HalysitesSilurian.jpg †[[Halysites]]
 * †Halysites louisvillensis – type locality for species
 * †Halysites meandrinus – tentative report
 * †Halysites nitidus
 * †Haplistion
 * †Haplistion armstrongi
 * †Hapsiphyllum
 * †Hapsiphyllum cassedayi
 * †Hapsiphyllum cassedeyi
 * †Hebertella
 * †Hebertella alveolata
 * †Hebertella frankfortensis
 * †Hebertella occidentalis
 * †Hebertella parkensis
 * †Hebertella parksensis
 * †Hebertella sinuata
 * †Helicelasma
 * †Helicelasma rusticum
 * †Helicotoma
 * †Helicotoma planulatoides – type locality for species
 * †Heliolites
 * †Heliolites megastoma
 * †Heliolites romingeri
 * †Heliolites spongiosus
 * †Heliolites spongodes
 * †Heliolites subtubulatus
 * Heliophyllum halli Bethany Center Centerfield 2.jpg †[[Heliophyllum]]
 * †Heliophyllum alternatum
 * †Heliophyllum ethelanum
 * †Heliophyllum gurleyi
 * †Heliophyllum halli
 * †Heliophyllum infundibulum
 * †Heliophyllum insigne
 * †Heliophyllum tenuiseptatum
 * †Helminthochiton
 * †Helminthochiton blacki
 * †Hemiphragma
 * †Hemiphragma tenuimurale – or unidentified comparable form
 * †Hemitrypa
 * †Hesperorthis
 * †Hesperorthis tricenaria
 * †Heterophrentis
 * †Heterophrentis concava
 * †Heterophrentis foliata
 * †Heterophrentis simplex
 * †Heterophrentis subcompressa
 * †Heterorthina
 * †Heterorthina macfarlani
 * †Heterotrypa
 * †Heterotrypa frondosa – or unidentified comparable form
 * †Heterotrypa trentonensis
 * †Hierogramma
 * †Hierogramma jeffreyi
 * †Hindia
 * †Hindia parva
 * †Hippocardia
 * †Hiscobeccus
 * †Hiscobeccus capax
 * †Histocrinus
 * †Histocrinus coreyi
 * †Histocrinus stellatus – tentative report
 * †Hoareicardia
 * †Hoareicardia cunea
 * †Holcocrinus
 * †Holcocrinus nodobrachiatus
 * †Holcocrinus spinobrachiatus
 * Holopeidae - Holopea praestans.JPG †[[Holopea]]
 * †Holopea insignis
 * †Holopea parvula – or unidentified comparable form
 * †Holtedahlina
 * †Holtedahlina sulcata
 * †Homaloneura – type locality for genus
 * †Homaloneura redbirdi – type locality for species
 * †Homotelus
 * †Homotrypa
 * †Homotrypa callosa
 * †Homotrypa similis
 * †Hormotoma
 * †Hormotoma gracilis
 * †Hudsonospongia
 * †Hustedia
 * †Hustedia miseri – or unidentified comparable form
 * †Hustedia mormoni – or unidentified comparable form
 * †Hybocrinus
 * †Hybocrinus tumidus
 * †Hybocystites
 * †Hybocystites problematicus
 * †Hylodecrinus
 * †Hylodecrinus asper
 * †Hylodecrinus bonoensis
 * †Hylodecrinus briareus – tentative report
 * †Hylodecrinus sculptus
 * †Hyolithes parviuscula
 * †Hypergonia
 * †Hypergonia marvinwelleri
 * †Hypselocrinus
 * †Hypselocrinus campanulus
 * †Hypselocrinus hoveyi

I

 * †Ianthinopsis
 * †Ianthinopsis medialis
 * †Idiognathoides
 * †Idiognathoides ouachitensis
 * †Idiognathoides sinuatus
 * †Idiognathoides tuberculatus
 * †Imitoceras
 * [[File:Iocrinus subcrassus, crinoid, Late Ordovician, McMillan Formation, Butler County, Ohio, USA - Houston Museum of Natural Science - DSC01499.JPG|thumb|upright|Fossil of the Ordovician crinoid ("sea lily") Iocrinus]] †[[Iocrinus]]
 * †Ischyrodonta
 * †Ischyrodonta elongata – tentative report
 * †Ischyrodonta modioliformis
 * †Isochilina
 * †Isochilina ampla – or unidentified comparable form
 * †Isorophus
 * †Isorophus cincinnatiensis
 * †Isorthoceras
 * †Isorthoceras albersi – type locality for species
 * Isotelus brachycephalus.JPG †[[Isotelus]]
 * †Isotelus gigas
 * †Isotelus maximus

J

 * †Jonesella
 * †Jonesella crepidiformis
 * †Jonesella obscura – or unidentified related form

K

 * †Kalymma
 * †Kalymma auriculata
 * †Kalymma grandis
 * †Kalymma hippocrepis
 * †Kalymma lirata
 * †Kalymma minuta
 * †Kalymma resinosa
 * †Kaskia
 * †Kaskia chesterensis
 * †Kazakhstania
 * †Kazakhstania colubrella
 * †Kazakhstania mangeri
 * †Ketophyllum
 * †Ketophyllum intertrium
 * †Kinkaidia – type locality for genus
 * †Kinkaidia cancellata – type locality for species
 * †Kirkbya
 * †Kodonophyllum
 * †Kodonophyllum vadum
 * †Krausella

L

 * †Labechia
 * †Labechia huronensis
 * †Laccoprimitia
 * †Laccoprimitia centralis
 * †Lambeophyllum – tentative report
 * †Lamprophyllum
 * †Lamprophyllum niagarense
 * †Lanecrinus
 * †Lanecrinus depressus
 * †Lanecrinus repertus
 * †Lanthanaster
 * †Lanthanaster intermedius
 * †Laphamoceras
 * †Laphamoceras scofieldi – or unidentified comparable form
 * †Lecocrinus
 * †Lecocrinus springeri
 * †Lekocrinus
 * †Lekocrinus planibrachiatus
 * †Leperditella
 * †Leperditella glabra
 * †Leperditia
 * †Leperditia caecigena
 * †Lepidocoleus
 * Stigmaria Heimans.jpg †[[Lepidodendron]]
 * †Lepidodendron aculeatum – or unidentified comparable form
 * †Lepidodendron baylense
 * †Lepidodendron boylensis
 * †Lepidodendron noralbaniense
 * †Lepidodendron volkmannianum
 * †Lepidophylloides
 * †Lepidophylloides longifolium
 * †Lepidostrobophyllum
 * †Lepidostrobophyllum lanceolatum
 * †Lepidostrobus
 * †Lepidostrobus fisheri
 * †Lepidostrobus kentuckiensis
 * †Lepidostrobus ornatus – tentative report
 * †Lepidostrobus shopfii – type locality for species
 * †Leptaena
 * †Leptaena gibbosa
 * †Leptaena kentuckiana – type locality for species
 * †Leptaena richmondensis
 * †Levizygopleura
 * †Levizygopleura inornata
 * Lingulella caelata 1.png †[[Lingulella]]
 * †Linoproductus
 * †Linoproductus cora
 * †Liospira
 * †Liospira decipens
 * †Liospira micula
 * †Liospira progne
 * †Liospira vitruvia
 * †Liroceras
 * †Listrochiton – type locality for genus
 * †Listrochiton weiri – type locality for species
 * Lithophaga – tentative report
 * †Litostrobus
 * †Litostrobus iowensis – or unidentified comparable form
 * †Lophophyllidium
 * †Lophophyllidium proliferum
 * †Lophospira
 * †Lophospira abnormis
 * †Lophospira decursa – or unidentified comparable form
 * †Lophospira milleri
 * †Lophospira obliqua
 * †Lophospira perangulata
 * †Lophospira type locality for species A – informal
 * †Lophotriletes
 * †Lophotriletes gibbosus
 * †Loxobucania
 * †Loxobucania lindsleyi – type locality for species
 * †Loxobucania nashvillensis
 * †Loxobucania singularis – type locality for species
 * †Loxonema
 * †Loxonema nitida
 * †Loxoplocus
 * †Lycopogenia
 * †Lycopogenia callicyrta
 * †Lycospora
 * †Lycospora granulata
 * †Lycospora micropapillata
 * †Lycospora pellucida
 * †Lycospora pusilla
 * †Lycospora rotunda
 * †Lycospora subjuga
 * †Lyrodesma
 * †Lyrodesma acuminatum – or unidentified comparable form
 * †Lyrodesma inornatum – tentative report

M

 * †Maclurites
 * †Macrocrinus
 * †Macrocrinus konincki
 * †Macrocrinus mundulus
 * †Macrocrinus verneuillianus
 * †Macurdablastus
 * †Macurdablastus uniplicatus
 * †Maelonoceras
 * †Maelonoceras praematurum – or unidentified comparable form
 * †Magnuscrinus
 * †Magnuscrinus kammeri
 * †Magnuscrinus praegravis
 * †Marginatia
 * †Marginicinctus
 * †Marginifera
 * †Mariopteris
 * †Mariopteris nervosa
 * †Masonoceras – type locality for genus
 * †Masonoceras kentuckiense – type locality for species
 * †Maximites
 * †Maximites nassichuki – type locality for species
 * †Meekopora
 * †Meekopora eximia
 * †Meekospira
 * †Meekospira evansvillensis
 * †Meekospira minuta
 * †Meekospira mississippiensis
 * †Meekospira peracuta
 * †Megalaspidae – tentative report
 * †Megalaspidae pygidium – informal
 * †Megalomphala
 * †Megalomphala crassa
 * †Meniscocrinus
 * Meristella two views.png †[[Meristella]]
 * †Meristella nasuta
 * †Meristina – tentative report
 * †Meristoschisma
 * †Meristoschisma hudsoni
 * †Merocanites
 * †Merocrinus
 * †Mesocyridira
 * †Mesocyridira flagrocosta
 * †Mesocyridira washingtonensis
 * †Mesopalaeaster
 * †Mesopalaeaster finei
 * †Mesopilocrinus – tentative report
 * †Mesopilocrinus romingeri
 * †Mesotrypa
 * †Mespilocrinus
 * †Mespilocrinus kentuckyensis – type locality for species
 * †Mespilocrinus myllos
 * †Mespilocrinus romingeri
 * †Metablastus
 * †Metablastus bipyramidalis
 * †Metablastus wortheni
 * †Metacromyocrinus
 * †Metacromyocrinus oklahomenisis
 * †Metichthyocrinus
 * †Metichthyocrinus clarkensis
 * †Metichthyocrinus tiaraeformis
 * †Michelinia
 * †Michelinoceras
 * †Micnoceras – or unidentified comparable form
 * †Microceras – tentative report
 * †Micromphalus – type locality for genus
 * †Micromphalus turris – type locality for species
 * †Micropileus
 * †Micropileus variabilis
 * †Microzygia
 * †Microzygia lacunosa
 * †Milleratia
 * †Milleratia shideleri – or unidentified related form
 * †Mimella
 * †Mitrospermum
 * †Mitrospermum compressum
 * †Modiolodon
 * †Modiolodon oviformis
 * †Modiolopsis
 * †Modiolopsis modiolaris
 * †Monomuchites
 * †Monomuchites annularis – type locality for species
 * †Monomuchites costalis – or unidentified comparable form
 * †Monomuchites obliquum – type locality for species
 * †Monticulipora
 * †Mourlonia
 * †Muensteroceras
 * †Muensteroceras oweni
 * †Murchisonia
 * †Murinella – tentative report
 * †Murrayoceras
 * †Murrayoceras murrayi – or unidentified comparable form

N

 * †Nannillaneus
 * †Neoicoceras
 * †Neoicoceras elkhornense – type locality for species
 * Trigonotretidae - Neospirifer ravana.JPG †[[Neospirifer]]
 * †Neospirifer cameratus
 * †Neozaphrentis
 * †Neuropteris
 * †Neuropteris gigantea
 * †Neuropteris heterophylla
 * †Neuropteris tenuifolia – or unidentified comparable form
 * †Nipterocrinus
 * †Nipterocrinus monroensis
 * †Nucleospira – tentative report
 * Nuculana
 * †Nuculana belliostriata
 * †Nucularca
 * †Nucularca cingulata
 * †Nucularca pectunculoides – or unidentified related form
 * †Nuculites
 * †Nuculites fabula
 * †Nuculopsis
 * †Nuculopsis girtyi
 * †Nuculopsis subrotunda
 * †Nyctopora – tentative report

O

 * †Octonaria
 * †Octonaria bicava
 * †Odontophyllum
 * †Odontophyllum convergens
 * †Odontophyllum patellatum
 * †Odontophyllum tornatum
 * †Oepikina
 * †Oepikina minnesotensis
 * †Oliganisus
 * †Oncoceras
 * †Oncoceras major – type locality for species
 * †Oncoceras multicameratum
 * †Onniella
 * Synerocrinidae - Onychocrinus.JPG †[[Onychocrinus]]
 * †Onychocrinus grandis – type locality for species
 * †Onychocrinus pulaskiensis
 * †Orbiculoidea
 * †Orbiculoidea convexa
 * †Orbiculoidea manhattensis
 * †Orbitremites
 * †Orbitremites coralridgensis – type locality for species
 * †Orbitremites kentuckyensis – type locality for species
 * †Orbitremites oppelti
 * †Ordogeisonoceras
 * †Ordogeisonoceras amplicameratum – type locality for species
 * †Ormoceras
 * †Ormoceras ferecentricum – type locality for species
 * †Orthis
 * †Orthis testudinaria
 * †Orthoceras
 * †Orthodesma
 * †Orthonybyoceras
 * †Orthonychia
 * †Orthonychia chesterense
 * †Orthorhynchula
 * †Orthorhynchula linneyi
 * †Orthorhynchula sublinneyi
 * †Orthotetes
 * †Ovatia

P

 * †Pachydictya
 * †Pachyglossella
 * †Pachylocrinus
 * †Pachylocrinus aequalis
 * †Palaeacis
 * †Palaeacis cuniformis
 * †Palaeocapulus
 * †Palaeocapulus acutirostre
 * †Palaeocaudina
 * †Palaeocaudina kansasensis
 * †Palaeoconcha
 * †Palaeoconcha obliqua
 * †Palaeocrinus
 * †Palaeocrinus avondalensis
 * †Palaeocrinus planobasalis
 * †Palaeoneila
 * †Palaeoneilo
 * †Palaeoneilo socialis
 * †Palaeopteria
 * †Palaeopteria parvula – or unidentified related form
 * †Palaeostylus – tentative report
 * †Palaeozygopleura
 * †Palaeozygopleura delphicola
 * †Paleofavosites
 * †Paleofavosites prolificus
 * †Paracyrtolites
 * †Paracyrtolites parvus – type locality for species
 * †Paracyrtolites subplanus
 * †Paradichocrinus
 * †Paradichocrinus liratus
 * †Paradichocrinus planus
 * †Paradichocrinus polydactylus
 * †Paradichocrinus ramus
 * †Paradichocrinus sculptus
 * †Paragassizocrinus
 * †Paragassizocrinus disculus – or unidentified comparable form
 * †Paragassizocrinus kendrickensis
 * †Paragassizocrinus turris – or unidentified comparable form
 * †Paraliospira – tentative report
 * †Paraliospira mundula – type locality for species
 * †Paraparchites
 * †Paraparchites subcircularis
 * †Parascytalocrinus
 * †Parascytalocrinus hamiltonensis
 * †Parascytalocrinus pentagonus
 * †Parisocrinus – tentative report
 * †Parvohallopora
 * †Parvohallopora onealli
 * †Parvohallopora ramosa
 * †Patellilabia
 * †Patellilabia chesterensis
 * †Patellostium
 * †Pattersonia
 * †Pattersonia aurita
 * †Pattersonia tuberosa
 * †Paupospira
 * †Paupospira bowdeni
 * †Paupospira burginensis
 * †Paupospira oweni
 * †Paupospira sumnerensis
 * †Paupospira tenuistriata
 * †Paupospira tropidophora
 * †Pecopteris
 * †Pecopteris plumosa – or unidentified comparable form
 * †Pelecocrinus
 * †Pelecocrinus type locality for species – informal
 * †Pellecrinus
 * †Pellecrinus obuncus
 * †Pentagonia
 * †Pentagonia biplicata
 * †Pentamerus
 * Pentremites Glen Dean Fm KY.jpg †[[Pentremites]]
 * †Pentremites abruptus
 * †Pentremites clavatus
 * †Pentremites conoideus
 * †Pentremites elegans
 * †Pentremites girtyi
 * †Pentremites godoni
 * †Pentremites halli
 * †Pentremites okawensis
 * †Pentremites platybasis
 * †Pentremites princetonensis – or unidentified comparable form
 * †Pentremites pyramidatus
 * †Pentremites pyriformis
 * †Pentremites spicatus
 * †Pentremites springeri
 * †Pentremites symmetricus
 * †Pentremites tulipaformis
 * †Pentremites tulipiaformis
 * †Pentremites welleri
 * †Perditocardinia
 * †Perditocardinia dubia
 * †Periastron
 * †Periastron perforatum
 * †Periastron reticulatum
 * †Periastron reticulum
 * †Pericyclus
 * †Peripristis
 * †Peripristis semicircularis
 * †Permophorus
 * †Peronopora
 * †Peronopora decipiens – or unidentified comparable form
 * †Peronopora granulifera – or unidentified comparable form
 * †Peronopora milleri
 * †Petrocrania
 * †Petrocrania scabiosa
 * †Petropegia
 * †Petropegia radiata – type locality for species
 * †Petropegia spinosa – type locality for species
 * †Phaneroceras
 * †Phaneroceras chesnuti – type locality for species
 * †Phanocrinus
 * †Phanocrinus parvaramus
 * †Phestia
 * †Phestia prolongata
 * †Phillibole
 * †Phillipsia
 * †Phillipsia bufo
 * †Phragmolites
 * †Phragmolites bellulus – type locality for species
 * †Phragmolites compressus – type locality for species
 * †Phymatophyllum
 * †Phymatophyllum nanum
 * †Phytokneme
 * †Phytokneme rhodona
 * †Pietzschia
 * †Pietzschia polyupsilon
 * †Pionodema
 * †Pionodema rectimarginata
 * †Pionomena
 * †Pionomena recens
 * †Pithodea
 * †Pithodea americana
 * †Pitys
 * †Pitys brownii
 * Plaesiomyiidae - Plesiomys subquadrata.JPG †[[Plaesiomys]]
 * †Plaesiomys subquadrata
 * †Plaesiomys subquatra
 * †Planalvus
 * †Planalvus densa
 * †Planisporites
 * †Planisporites granifer
 * †Planoendothyra
 * †Planoendothyra whitesidei – or unidentified comparable form
 * †Plasmopora
 * †Plasmopora elegans
 * †Plasmopora follis
 * †Platyaxum
 * †Platyaxum foliatum
 * †Platyaxum frondosum
 * †Platyaxum orthosoleniskum
 * †Platyaxum undosum
 * †Platyceras
 * Platycrinitidae - Platycrinites hemisphaericus cropped.jpg †[[Platycrinites]]
 * †Platycrinites bonoensis
 * †Platycrinites georgii
 * †Platycrinites glyptus
 * †Platycrinites hemisphaericus
 * †Platycrinites hemisphericus – tentative report
 * †Platycrinites planus
 * †Platycrinites sculptus
 * †Platycrinites spinifer
 * †Platylichas
 * †Platylichas halli
 * PlatystrophiaOrdovician.jpg †[[Platystrophia]]
 * †Platystrophia acutilirata
 * †Platystrophia amoena
 * †Platystrophia annieana
 * †Platystrophia auburnensis
 * †Platystrophia clarkesvillensis
 * †Platystrophia clarksvillensis
 * †Platystrophia colbiensis
 * †Platystrophia crassa
 * †Platystrophia cypha
 * †Platystrophia elegantula
 * †Platystrophia hopensis
 * †Platystrophia laticosta
 * †Platystrophia ponderosa
 * †Platystrophia sublaticosta
 * †Plectambonites
 * †Plectambonites plicatellus
 * †Plectocamara
 * †Plectoceras
 * †Plectoceras carletonense – or unidentified comparable form
 * †Plectorthis
 * †Plectorthis aequivalvis
 * †Plectorthis fissicosta
 * †Plectorthis plicatella
 * †Plectospira
 * Pleurodictyum americanum Kashong.jpg †[[Pleurodictyum]]
 * †Pleurodictyum cylindricum
 * †Pleurodictyum insigne
 * †Pleurodictyum louisvillensis
 * †Pleurodictyum maximum
 * †Pleurodictyum planum
 * †Pleurodictyum wardi
 * Pleurotomaria
 * †Plicodendrocrinus
 * †Plicodendrocrinus casei
 * †Plicorachis
 * †Plicorachis danvillensis
 * †Pojetaconcha
 * †Pojetaconcha cressmani
 * †Pojetoceras – type locality for genus
 * †Pojetoceras floweri – type locality for species
 * †Polaricyclus
 * †Polaricyclus ballardensis
 * †Polaricyclus bordenensis – type locality for species
 * †Polaricyclus conkini – type locality for species
 * †Polygnathus
 * †Polygnathus communis
 * †Polygrammoceras
 * †Polypora
 * †Polypora simulatrix
 * †Portlockiella – type locality for genus
 * †Portlockiella kentuckyensis – type locality for species
 * †Poteriocrinites
 * †Poteriocrinites horowitzi
 * †Prasopora
 * †Prasopora falesi
 * †Prasopora hospitalis
 * †Prasopora simulatrix
 * †Primaspis
 * †Prismopora
 * †Prismopora serrulata
 * †Productus
 * †Productus cestriensis
 * Proetus concinnus reconstruction cropped.png †[[Proetus (trilobite)|Proetus]]
 * †Prolecanites
 * †Prolecanites lyoni
 * †Propora
 * †Propora eminula
 * †Propora glabra
 * †Propora papillata
 * †Propora puella
 * †Protaraea
 * †Protaraea richmondensis
 * †Proteoceras
 * †Proteoceras tyronensis – type locality for species
 * †Protocyathactis
 * †Protocyathactis cybaeus – or unidentified comparable form
 * †Protosalvinia
 * †Protosalvinia arnoldii
 * †Protosalvinia furcata
 * †Protosalvinia rarenna
 * †Protosalvinia ravenna
 * Reconstruction of Prototaxites loganii.tif †[[Prototaxites]]
 * †Prototaxites ortoni
 * †Protozyga – tentative report
 * †Pseudobigalea
 * †Pseudobigalea crista
 * †Pseudoconocardium
 * †Pseudolingula
 * †Pseudomulceodens
 * †Pseudomulceodens cancellatus
 * †Pseudopolygnathus
 * †Pseudopolygnathus multistriatus
 * †Pseudorthoceras
 * †Pseudorthoceras knoxense
 * †Pseudozygopleura
 * †Pseudozygopleura deloi – or unidentified comparable form
 * †Pseudozygopleura lanceolatus
 * †Pseudozygopleura macra – or unidentified comparable form
 * †Pseudozygopleura scitula
 * †Pseudozygopleura semicostata
 * †Pterinea
 * †Pterinea demissa
 * †Pterotheca
 * †Pterotheca angusta
 * †Pterotheca expansa
 * †Pterotocrinus
 * †Pterotocrinus acutus
 * †Pterotocrinus armatus
 * †Pterotocrinus bifurcatus
 * †Pterotocrinus capitalis
 * †Pterotocrinus depressus
 * †Pterotocrinus lingulaformis
 * †Pterotocrinus spatulatus
 * †Ptychocrinus
 * †Punctatisporites
 * †Punctatisporites irrasus
 * †Punctatisporites minutus
 * †Punctospirifer
 * †Punctospirifer transversus
 * †Pustulatisporites
 * †Pustulatisporites crenatus
 * †Pycnactis
 * †Pycnactis tenuiseptatus

Q

 * †Quadratia
 * †Quepora
 * †Quepora huronensis
 * †Quepora louisvillensis – type locality for species

R

 * †Rafinesquina
 * †Rafinesquina alternata
 * †Rafinesquina ponderosa
 * †Rafinesquina trentonensis
 * †Rafinesquina winchesterensis
 * †Raistrickia
 * †Raistrickia breveminens
 * †Raistrickia crocea
 * †Raphistoma
 * †Raphistomina
 * †Raphistomina lapicida
 * †Rectifenestella
 * †Rectifenestella tenax
 * †Reinschospora
 * †Reinschospora triangularis
 * †Renisporites
 * †Renisporites confossus
 * †Resserella
 * †Reticulariina
 * †Reticulariina salemensis
 * †Reticulariina spinosa
 * †Reticulatisporites
 * †Reticulatisporites muricatus
 * †Retispira
 * †Retispira ornatus
 * †Rhabdocyclus
 * †Rhabdocyclus scutellus
 * †Rhegmaphyllum
 * †Rhegmaphyllum daytonensis
 * †Rhineoderma
 * †Rhineoderma wortheni
 * †Rhinidictya
 * †Rhipidomella
 * †Rhipidomella dubia
 * †Rhizophyllum
 * †Rhizophyllum attenuatum
 * †Rhizophyllum corniculum
 * †Rhodocrinites
 * †Rhodocrinites barrisi
 * †Rhombopora
 * †Rhombopora incrassata
 * †Rhombotrypa
 * †Rhombotrypa quadrata
 * †Rhynchopora
 * †Rhynchopora beecheri
 * †Rhynchotrema
 * †Rhynchotrema dentatum
 * †Rhynchotrema increbescens
 * †Rhynchotrema kentuckiensis
 * †Rhytiodentalium
 * †Rhytiodentalium kentuckyensis
 * †Rhytiophora
 * †Romingerella
 * †Romingerella major
 * †Romingeria
 * †Romingeria cummunata
 * †Romingeria umbellifera
 * †Romingeria vannula
 * Rostricellula
 * †Rostricellula minuta
 * †Ruedemannia
 * †Ruedemannia lirata
 * †Rugomena
 * †Rugomena vetusta
 * †Rugosochonetes

S

 * †Saffordophyllum
 * †Saffordophyllum floweri
 * †Salpingostoma
 * †Salpingostoma kentuckyense
 * †Salterospira
 * †Salterospira chesterensis
 * †Sarocrinus
 * †Sarocrinus varsoviensis
 * †Savagellites – tentative report
 * †Savagellites lindahli
 * †Savitrisporites
 * †Savitrisporites nux
 * †Scalites
 * †Scalites peracutum
 * †Scenophyllum
 * †Scenophyllum coniferum – tentative report
 * †Schizocrania
 * †Schizodus
 * †Schizophaulactis
 * †Schizophaulactis densiseptatus
 * †Schlotheimophyllum
 * †Schlotheimophyllum fulcratum
 * †Schlotheimophyllum ipomaea
 * †Schuchertella
 * †Schuchertella costatula
 * †Schuchertella minuta
 * Scytalocrinidae - Scytalocrinus.JPG †[[Scytalocrinus]]
 * †Scytalocrinus decadactylus
 * †Scytalocrinus robustus
 * †Seminula
 * †Seminula subtilita
 * †Septimyalina
 * †Setigerites
 * †Setigerites setiger
 * †Sevillea
 * †Sevillea trinucleata – or unidentified related form
 * †Siderella
 * †Siderella scotti
 * †Similodonta
 * †Similodonta hermitagensis – or unidentified related form
 * †Sinuites
 * †Sinuites cancellatus
 * †Sinuites globularis
 * †Sinuites granistriatus
 * †Sinuites obesa
 * †Sinuites pervoluta
 * †Sinuites planodorsatus – type locality for species
 * †Sinuitina
 * †Sinuspores
 * †Sinuspores sinuatus
 * †Siphonophrentis
 * †Siphonophrentis halli
 * †Soleniscus
 * †Soleniscus gracilis
 * †Soleniscus texanus
 * Solenoporaceae - Solenopora cropped.jpg †[[Solenopora]]
 * †Sowerbyella
 * †Sowerbyella curdsvillensis
 * †Sowerbyella grierensis – type locality for species
 * †Sowerbyella rugosa
 * †Sowerbyites
 * †Spackmanites
 * †Spackmanites habibii
 * †Sphenophyllum
 * †Sphenophyllum cuneifolium
 * Sphenopteris schumannii cropped.jpg †[[Sphenopteris]]
 * †Sphenopteris amoena
 * †Sphenopteris obtusiloba
 * †Sphenosphaera
 * †Sphenosphaera bilineatus – type locality for species
 * †Sphenosphaera burginensis
 * †Sphenosphaera capax
 * †Sphenosphaera mohri
 * †Sphenosphaera recurvus
 * †Sphenosphaera rogersensis
 * †Sphenosphaera troosti
 * †Sphenothallus
 * †Spicuchelodes
 * †Spicuchelodes cressmani
 * Spirifer perlamosus pedunculate valve.jpg †[[Spirifer]]
 * †Spirifer bifurcatus
 * †Spirifer increbescens
 * †Spirifer keokuk
 * †Spirifer lateralis
 * †Spirifer rockymontanus
 * †Spirifer subaequalis
 * †Spirifer tenuicostatus
 * †Spirifer washingtonensis
 * †Spiriferellina – tentative report
 * †Spiriferina
 * †Spiriferina subelliptica
 * †Sporangites
 * †Sporangites huronensis
 * †Springericrinus
 * †Springericrinus magniventrus
 * †Stauropteris
 * †Stauropteris biseriata
 * †Stegacanthia
 * †Stegocoelia
 * †Stegocoelia kentuckiensis
 * †Steloxylon
 * †Steloxylon irvingense
 * †Steloxylon santaecrucis
 * [[File:Stenaster salteri - National Museum of Nature and Science, Tokyo - DSC07718 cropped.jpg|thumb|upright|Fossils of the Ordovician-Silurian brittle star Stenaster]] †[[Stenaster]]
 * †Stenaster obtusus – or unidentified comparable form
 * †Stenomyelon
 * †Stenomyelon muratum
 * †Stenopora
 * †Stenoscisma
 * †Stenoscisma explanatum
 * †Stephanozyga
 * †Stephanozyga nodosa
 * †Stereolasma
 * †Stereolasma gallicalcar
 * †Stereolasma rectum
 * †Stereopteris
 * †Stereopteris annularis
 * †Stictopora
 * †Stictopora neglecta
 * Lycopsid joggins mcr1.JPG †[[Stigmaria]]
 * †Stigmaria ficoides
 * †Stigmaria wedingtonensis
 * †Stigmatella
 * †Stigmatella conica – or unidentified comparable form
 * †Stigmatella multispinosa
 * †Stinocrinus
 * †Stinocrinus granulosus
 * Stomatopora
 * †Stomatopora arachnoidea
 * †Straparollus
 * †Straparollus spergenensis
 * †Streblochondria
 * †Streblopteria
 * †Streptelasma
 * †Streptelasma angulatum
 * †Streptelasma divaricans
 * †Streptelasma obliquum
 * †Streptelasma scoleciforme
 * †Streptelasma subvesiculare – tentative report
 * †Striatopora
 * †Striatopora huronensis
 * †Strobeus
 * †Strobeus paludinaeformis – or unidentified comparable form
 * †Stromatocerium
 * †Stromatocerium huronense
 * †Strombodes
 * †Strombodes shumardi
 * Strophomena costellata brachial.jpg †[[Strophomena]]
 * †Strophomena concordensis
 * †Strophomena costellata – or unidentified comparable form
 * †Strophomena maysvillensis
 * †Strophomena musculosa – or unidentified comparable form
 * †Strophomena neglecta
 * †Strophomena planoconvexa
 * †Strophomena planumbona
 * †Strophomena sinuata
 * †Strophomena sulcata
 * †Strophostylus
 * †Strophostylus chesterensis
 * †Strophostylus wortheni
 * †Subulites
 * †Subulites parvus – type locality for species
 * †Sulcoretepora
 * †Sulcoretepora lineata
 * †Synbathocrinus
 * †Synbathocrinus angularis
 * †Synbathocrinus dentatus
 * †Synbathocrinus robustus
 * †Synbathocrinus swallovi
 * †Syringolites
 * †Syringolites vesiculosus
 * Syringoporid.jpg †[[Syringopora]]
 * †Syringopora hisingeri
 * †Syringopora monroensis
 * †Syringopora perelegans

T

 * †Tabulipora
 * †Tabulipora cestriensis
 * †Tabulipora penerudis
 * †Tabulipora ramosa
 * †Talarocrinus
 * †Talarocrinus simplex
 * †Tancrediopsis
 * †Tancrediopsis cuneata
 * †Tarphophragma
 * †Tarphophragma multitabulata
 * Taxocrinidae - Taxocrinus.JPG †[[Taxocrinus]]
 * †Taxocrinus colletti
 * †Taxocrinus pustulosus
 * †Technophorus
 * †Technophorus cincinnatiense
 * †Technophorus faberi
 * †Technophorus punctostriatus
 * †Teichochilina – tentative report
 * †Temnodiscus
 * †Temnodiscus nitidula
 * †Tetracamera
 * †Tetracamera arctirostrata
 * †Tetracamera grosvenori
 * †Tetracamera mutata
 * †Tetracamera subcuneata
 * †Tetradium
 * †Tetradium approximatum
 * †Tetradium cellulosum – or unidentified comparable form
 * †Tetranota
 * †Tetranota obsoleta
 * †Thamniscus
 * †Thamnopora
 * †Thamnopora limitaris
 * †Thamnoptychia
 * †Thamnoptychia alternans
 * †Thamnoptychia vermiculosa
 * †Thecia
 * †Thecia minor
 * †Theelia
 * †Theelia hexacneme – type locality for species
 * †Thinocrinus
 * †Thinocrinus lowei
 * †Thuroholia
 * †Thuroholia croneisi
 * †Thuroholia floydensis – type locality for species
 * †Thuroholia irregularis – type locality for species
 * †Thuroholia wanlessi – type locality for species
 * †Toichochilina
 * †Torynifer
 * †Torynifer pseudolineatus
 * †Torynifer setigera
 * †Trematis
 * †Trepospira
 * †Trepospira depressa
 * †Trepospira illinoisensis
 * Proteoceratidae - Treptoceras duseri cropped.jpg †[[Treptoceras]]
 * †Treptoceras cincinnatiensis
 * †Treptoceras duseri
 * †Treptoceras transversum
 * †Triarthrus
 * †Triarthrus eatoni
 * †Triboloporus
 * †Triboloporus cryptoplicatus
 * †Triendoceras – tentative report
 * †Triendoceras davisi – type locality for species
 * †Trigonocarpus
 * †Trigonodictya
 * †Trigonodictya acuta
 * †Trocholites
 * †Trocholites faberi
 * †Trochonema
 * †Trochonema canadensis
 * †Trochonema subcrassum
 * †Trochonemella
 * †Trochonemella notablis
 * †Trochophyllum
 * †Tropidodiscus
 * †Tryplasma
 * †Tryplasma cylindrica
 * †Tryplasma mitella
 * †Tryplasma prava
 * †Tryplasma radicula

U

 * †Ulodendron
 * †Ulodendron majus
 * †Ulrichia
 * †Ulrichia nodosa
 * Cladida - Ulrichicrinus.JPG †[[Ulrichicrinus]]
 * †Ulrichicrinus agnatus
 * †Ulrichocystis
 * †Ulrichocystis eximia
 * †Undulabucania
 * †Undulabucania punctifrons
 * †Uperocrinus
 * †Uperocrinus acuminatus – type locality for species
 * †Uperocrinus nashvillae
 * †Uperocrinus pyriformis
 * †Uperocrinus robustus

V

 * †Vaginoceras
 * †Vallatotheca
 * †Vallatotheca unguiformis
 * †Vanuxemia
 * †Vanuxemia dixonensis – or unidentified related form
 * †Vanuxemia gibbosa
 * †Vanuxemia nana – or unidentified comparable form
 * †Vanuxemia sardesoni – or unidentified related form
 * †Verrucosisporites
 * †Verrucosisporites microtuberosus
 * †Vestispora
 * †Vestispora costata
 * †Volsellina
 * †Volsellina subelliptica
 * †Vorticina
 * †Vorticina anneae – type locality for species

W

 * †Waagenella
 * †Waagenella claxtonensis
 * †Wachsmuthicrinus
 * †Wachsmuthicrinus spinosulus
 * †Wachsmuthicrinus spinulosus
 * †Warthinia
 * †Warthinia nodosa
 * †Weissistachys
 * †Weissistachys kentuckiensis
 * †Wellergyi – type locality for genus
 * †Wellergyi chesterensis
 * †Whiteavesia
 * †Wilsonites
 * †Wilsonites circularis
 * †Wilsonites vesicatus
 * †Winchelloceras
 * †Winchelloceras allei
 * †Winchelloceras knappi – type locality for species
 * †Worthenia
 * †Worthenia tabulata
 * †Worthenocrinus
 * †Worthenocrinus hardinensis
 * †Worthenopora

X

 * †Xenocrinus
 * †Xyeleblastus
 * †Xyeleblastus magnificus

Z

 * †Zadelsdorfia – tentative report
 * †Zaphrenthis
 * †Zaphrenthis amplexiformis – tentative report
 * †Zygospira
 * †Zygospira cincinnatiensis
 * †Zygospira kentuckyensis
 * †Zygospira lebanonensis
 * †Zygospira modesta