List of the Paleozoic life of Arkansas

This list of the Paleozoic life of Arkansas contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of Arkansas and are between 541 and 252.17 million years of age.

A

 * †Adnatoceras
 * †Adnatoceras alaskense
 * †Ahrensisporites
 * †Ahrensisporites guerickei
 * †Amphiscapha
 * †Amphiscapha intermedius
 * †Amphissites
 * †Amphissites rugosus
 * †Amplexizaphrentis
 * †Amplexizaphrentis maneri – type locality for species
 * †Amplexizaphretis
 * †Amplexizaphretis maneri – type locality for species
 * †Amplexus
 * †Ananaspis
 * †Anchicrinus
 * †Anchicrinus planulatus
 * †Ancillotoechia
 * †Ancillotoechia marginata
 * †Angyomphalus
 * †Angyomphalus desultoria – type locality for species
 * †Angyomphalus discus
 * †Anomphalomorpha – report made of unidentified related form or using admittedly obsolete nomenclature
 * †Anthracoceras
 * †Anthracoceras paucilobum
 * †Anthracomartus
 * †Anthracomartus trilobitus – type locality for species
 * †Anthracospirifer
 * †Antiquatonia
 * †Antirhynchonella
 * †Antirhynchonella thomasi
 * †Aphelaeceras
 * †Aphelaeceras arkansanum – type locality for species
 * †Aphralysia – tentative report
 * †Apiculatasporites
 * †Apiculatasporites variocorneus
 * †Apotocardium
 * †Apotocardium peculiare – type locality for species
 * †Apotocardium polymitarium – type locality for species
 * †Apotocardium snideri – tentative report
 * †Arcanoceras
 * †Arcanoceras furnishi – type locality for species
 * †Archaeocidaris
 * Archaeolithophyllum – tentative report
 * †Archimastax
 * †Archimastax americanus – type locality for species
 * Fenestellidae - Archimedes species.JPG]] †Archimedes''
 * †Archimylacris
 * †Archimylacris venusta – type locality for species
 * †Arkacrinus
 * †Arkacrinus dubius
 * †Arkanites
 * †Arkanites relictus
 * †Arkoceras
 * †Arkoceras exiguum
 * †Asketomorpha – type locality for genus
 * †Asketomorpha grandis – type locality for species
 * †Asphaltina
 * †Astartella
 * †Astartella concentrica – or unidentified comparable form
 * †Athyris
 * †Atrypa
 * †Atrypina
 * †Atrypina erugata
 * Aviculopecten subcardiformis01.JPG †[[Aviculopecten]]
 * †Aviculopecten inspeciosus
 * †Aviculopecten jennyi
 * †Aviculopecten morrowensis
 * †Aviculopecten squamula
 * † Avonia
 * †Avonia honeycreekensis
 * †Axinolobus
 * †Axinolobus modulus – type locality for species

B

 * †Bactrites
 * †Bactrites carbonarius
 * †Bactrites gaitherensis
 * †Bactrites redactus
 * †Bactrites smithianus
 * †Bactritimimus
 * †Bactritimimus girtyi – type locality for species
 * †Bactritimimus ulrichi – type locality for species
 * †Baiosoma
 * †Baiosoma cucullata – type locality for species
 * Bairdia
 * †Bairdia girtyi
 * †Barytichisma
 * †Barytichisma clubinei
 * †Barytichisma ozarkana
 * †Baschkirites
 * †Baschkirites librovitchi
 * †Beecheria
 * †Bellerophon
 * †Bellerophon welshi
 * †Bisatoceras
 * †Bisatoceras secundum
 * †Bistrialites
 * †Bistrialites bicostatus – type locality for species
 * †Boesites
 * †Boesites scotti
 * †Borestus
 * †Boucotides
 * †Boucotides barrandei
 * †Brachycycloceras
 * †Brachycycloceras washingtonense – type locality for species
 * †Brachymimulus
 * †Brachymimulus americanus
 * †Brachymimulus elongatus
 * †Brachythyris
 * †Bradyphyllum
 * †Bradyphyllum lesliense – type locality for species
 * †Branneroceras
 * †Branneroceras branneri
 * †Bridgeites
 * †Bridgeites planidorsalis – type locality for species
 * †Buttsia
 * †Buttsia drabensis
 * †Buxtonia

C

 * †Cancelloceras
 * †Cancelloceras hunstvillense – type locality for species
 * †Cancelloceras huntsvillense – type locality for species
 * †Caneyella
 * †Caneyella peculiaris
 * †Caneyella percostata
 * †Caneyella wapanuckensis – or unidentified comparable form
 * †Caninostrotion
 * †Caninostrotion variabilis
 * †Carcharopsis
 * †Carcharopsis wortheni
 * †Cardiomorpha – tentative report
 * †Cardiomorpha inflata
 * †Caryocrinites
 * †Cavellina
 * †Cavusgnathus
 * †Centrotarphyceras
 * †Centrotarphyceras yellvillense
 * †Ceratopea
 * †Ceratopea unguis
 * †Cheilocephalus
 * †Cheilocephalus brachyops
 * Trilobite Ordovicien 8127.jpg †[[Cheirurus]]
 * †Cheirurus phollikodes – type locality for species
 * †Cheirurus prolixus – type locality for species
 * †Choctawites
 * †Choctawites choctawensis
 * †Chonetes
 * †Clathrospira
 * †Clathrospira virguncula
 * †Cleiothyridina
 * †Cliffia
 * †Cliffia lataegenae
 * †Cluthoceras
 * †Cluthoceras glicki – type locality for species
 * †Clytoceras
 * †Clytoceras capax
 * †Coelogasteroceras
 * †Coelogasteroceras gracile
 * †Comanchia
 * †Comanchia amplooculata
 * Compositafossil.jpg †[[Composita]]
 * †Compsonema
 * †Convolutispora
 * †Copiceras
 * †Copiceras erectum
 * †Cornuproetus
 * †Cornuproetus kyphora – type locality for species
 * †Cranaena
 * †Crassispora
 * †Crassispora kosankei
 * †Cravenoceras
 * †Cravenoceras lineolatum – type locality for species
 * †Criboconcha
 * †Cristatisporites
 * †Cristatisporites connexus
 * †Cristatisporites indignabundus
 * †Cromyocrinus
 * †Cromyocrinus grandis – type locality for species
 * †Crurithyris
 * †Crurithyris parva
 * †Ctenobactrites
 * †Ctenobactrites lesliensis – type locality for species
 * †Cupulocorona
 * †Cupulocorona gemmiformis
 * †Cupulocorona osgoodensis
 * †Cyclogranisporites
 * †Cycloplectoceras
 * †Cycloplectoceras funatum
 * †Cycloplectoceras miseri
 * †Cymoceras
 * †Cymoceras cracens
 * †Cymostrophia – report made of unidentified related form or using admittedly obsolete nomenclature
 * †Cypricardella
 * †Cypricardella subalata
 * †Cypricardinia – tentative report
 * †Cypricardinia fayettevillensis
 * †Cyrtina

D

 * †Dalmanites – type locality for genus
 * †Dalmanites bassleri
 * †Dalmanites howelli
 * †Dalmanites ptyktorhion – type locality for species
 * †Decoroproetus
 * †Decoroproetus anaglyptus – type locality for species
 * †Decoroproetus corycoeus
 * Deiphon forbesi cropped.png †[[Deiphon]]
 * †Deiphon longifrons
 * †Dellea
 * †Dellea suada
 * †Delops
 * †Densosporites
 * †Densosporites annulatus
 * †Densosporites irregularis
 * †Densosporites sphaerotriangularis
 * †Densosporites triangularis
 * †Dentoceras
 * †Dentoceras belemnitiforme – type locality for species
 * †Desmoinesia
 * †Diaboloceras
 * †Diaboloceras neumeieri – type locality for species
 * †Diaboloceras varicostatum
 * Trilobit diacalymene 2ps vistafrontal.jpg †[[Diacalymene]]
 * †Diacalymene altirostris
 * †Diacamaropsis
 * †Diacamaropsis parva
 * †Diaphragmus
 * †Dicamaropsis
 * †Dicamaropsis parva
 * †Dicoelosia
 * †Dicoelosia bilobella
 * †Dielasma
 * †Dinocycloceras
 * †Dinocycloceras ballianum – or unidentified comparable form
 * †Dinocycloceras prolixum
 * †Diphuicrinus
 * †Diphuicrinus croneisi
 * †Dolerorthis – tentative report
 * †Dolerorthis nanella
 * †Dolorthoceras
 * †Dolorthoceras caneyanum – or unidentified comparable form
 * †Dolorthoceras incisum – type locality for species
 * †Dolorthoceras tenuifilosum – type locality for species

E

 * †Echinaria
 * †Echinoconchus
 * †Economolopsis – type locality for genus
 * †Economolopsis gordoni – type locality for species
 * †Ectogrammysia – type locality for genus
 * †Ectogrammysia crassatis – type locality for species
 * †Edmondia
 * †Edmondia equilateralis
 * †Edmooroceras
 * †Edmooroceras plummeri
 * Encrinurus egani from Wisconsin.JPG †[[Encrinurus]]
 * †Encrinurus egani
 * †Endolobus
 * †Endolobus clorensis
 * †Eoasianites
 * †Eoasianites smithwickensis
 * †Eophacops
 * †Eophacops fontana – type locality for species
 * †Eopteria
 * †Eopteria richardsoni
 * †Eospirifer
 * †Eospirifer acutolineatus
 * †Eowellerites
 * †Eowellerites discoidalis – type locality for species
 * †Eowellerites moorei – or unidentified comparable form
 * †Ephippioceras
 * †Ephippioceras ferratum
 * †Epistroboceras
 * †Epistroboceras lesliense – type locality for species
 * †Epistroboceras mangeri – type locality for species
 * †Epistroboceras pitkinense – type locality for species
 * EucalyptocrinitesCalyx.jpg †[[Eucalyptocrinites]]
 * †Euchondria
 * †Euconospira
 * †Euconospira desereti – or unidentified related form
 * †Euconospira disjuncta
 * †Euloxoceras
 * †Euloxoceras angustius – type locality for species
 * †Euloxoceras greenei
 * †Eumetria
 * †Eumorphoceras
 * †Eumorphoceras bisulcatum
 * †Eumorphoceras milleri – type locality for species
 * †Eumorphoceras ornatissimum – or unidentified comparable form
 * Euomphalus fossil cropped.png †[[Euomphalus]]
 * †Euomphalus konobasis – type locality for species
 * †Euomphalus variabilis – type locality for species
 * †Eupachycrinus
 * †Eupachycrinus magister – or unidentified comparable form
 * †Euphemites
 * †Euphemites chesterensis – type locality for species
 * †Euphemites whirligigi – type locality for species

F

 * †Fayettevillea
 * †Fayettevillea planorbis – type locality for species
 * †Florinites
 * †Florinites similis
 * †Florinites volans

G

 * †Garwoodia – tentative report
 * †Gastrioceras
 * †Gastrioceras adaense
 * †Gastrioceras fittsi
 * †Gastrioceras formosum – type locality for species
 * Miocene Bored Cobble Cut labeled.jpg [[Gastrochaenolites]]
 * †Gastrochaenolites anauchen
 * †Gattendorfia
 * †Geisina – tentative report
 * †Geisina retiferiformis
 * †Girtyoceras
 * †Girtyoceras welleri – type locality for species
 * †Girtyspira
 * †Girtyspira microspirula – type locality for species
 * †Girvanella
 * †Glabrocingulum
 * †Glabrocingulum binodosum
 * †Glabrocingulum coronulum – type locality for species
 * †Glabrocingulum parasolum – type locality for species
 * †Glabrocingulum parvanodum – type locality for species
 * †Glabrocingulum quadrigatum
 * †Glaphyrites
 * †Glaphyrites depressus
 * †Glaphyrites fayettevillae – type locality for species
 * †Glaphyrites morrowensis
 * †Globozyga
 * †Globozyga mediocris – type locality for species
 * †Glyphiolobus
 * Glyptambon verrucosus.jpg †[[Glyptambon]] – type locality for genus
 * †Glyptambon verrucosus
 * †Glyptopleura
 * †Glyptopleura angulata
 * †Glyptopleura inopinata
 * †Gnathodus
 * †Gnathodus texanus
 * †Goniatites
 * †Goniatites crenistria – or unidentified related form
 * †Goniatites granosus
 * †Goniatites multiliratus
 * †Gordonites
 * †Gordonites filifer
 * †Gordonites matheri
 * †Granulatisporites
 * †Granulatisporites adnatoides
 * †Graphiadactyllis
 * †Graphiadactyllis arkansana
 * †Graphiadactyllis fayettevillensis

H

 * †Haplistion
 * †Haplistion sphaericum
 * †Harpidella
 * †Harpidella butorus – type locality for species
 * †Harpidella spinulocervix
 * †Healdia
 * †Hematites
 * †Hematites barbarae
 * †Holocystites
 * †Holocystites alternatus
 * †Homoceratoides
 * †Homoceratoides cracens
 * †Homoeospirella
 * †Homoeospirella costatula
 * †Homoeospirella pygmaea
 * †Hormotoma
 * †Hormotoma anna
 * †Hormotoma artemesia – type locality for species
 * †Housia
 * †Housia vacuna
 * †Howellella
 * †Howellella splendens
 * †Hudsonoceras
 * †Hudsonoceras moorei
 * †Hustedia
 * †Hydreionocrinus
 * †Hypotetragona – tentative report

I

 * †Imitoceras
 * †Imitoceras sinuatum – type locality for species
 * †Imoella – type locality for genus
 * †Imoella obscura – type locality for species
 * †Imogloba
 * †Imogloba gandyensis
 * †Imonautilus – type locality for genus
 * †Imonautilus meeki – type locality for species
 * †Incisurella
 * †Incisurella prima
 * †Inflatia
 * †Inflatia clydensis
 * †Irvingella
 * †Irvingella major

J

 * †Janthimorpha – report made of unidentified related form or using admittedly obsolete nomenclature
 * †Jasperoceras
 * †Jasperoceras costatum

K

 * †Kaskia
 * †Kaskia chesterensis
 * †Kazakhstania – tentative report
 * †Kindbladia
 * †Kindbladia wichitaensis
 * †Kinkaidia
 * †Kinkaidia trigonalis
 * †Kirkbya
 * †Kirkbya reflexa
 * †Kirkbyella
 * †Kirkbyella quadrata
 * †Knightoceras
 * †Knightoceras oxylobatum – type locality for species
 * †Knightoceras patulum
 * †Knoxisporites
 * †Knoxisporites triradiatus
 * †Kozlowskiellina
 * †Kozlowskiellina vaningeni
 * †Krotovia

L

 * †Laevigatosporites
 * †Laevigatosporites desmoinesensis
 * †Laevigatosporites vulgaris
 * †Lasanocrinus
 * †Lasanocrinus strigosus
 * †Leangella
 * †Leangella dissiticostella
 * †Leonardophyllum
 * †Leonardophyllum arkansanum
 * †Lepdioproetus
 * †Lepdioproetus xeo – type locality for species
 * †Leptaena
 * †Leptagonia
 * †Leptocyrtoceras
 * †Leptocyrtoceras curvatum
 * †Leptocyrtoceras powellense
 * †Leptodesma
 * †Limipecten
 * †Lingula
 * †Linoproductus
 * †Liroceras – tentative report
 * †Lissatrypa
 * †Lissatrypa clairensis
 * †Lissostrophia
 * †Lophamplexus – tentative report
 * †Lophophyllidium
 * †Lophophyllidium imoense – type locality for species
 * †Lophotriletes
 * †Lophotriletes microsaetosus
 * †Lusitanites
 * †Lusitanites subcircularis
 * †Lycospora
 * †Lycospora micropapillata
 * †Lycospora pellucida
 * †Lygdozoon – type locality for genus
 * †Lygdozoon anoplos – type locality for species
 * †Lygdozoon arkansanum
 * †Lygdozoon collatum – type locality for species
 * †Lysocystites – or unidentified related form

M

 * †Macropotamorhynchus
 * †Macropotamorhynchus chouteauensis
 * †Macropotamorhynchus tuta
 * †Macrostylocrinus
 * †Magnumbonella
 * †Mammoides
 * †Mariceras
 * †Marmolatella
 * †Marmolatella imoensis – type locality for species
 * †Marmolatella macgordoni – type locality for species
 * †Meekospira
 * †Meekospira minuta
 * †Megaglossoceras
 * †Megaglossoceras glicki – type locality for species
 * †Megapronorites
 * †Megapronorites baconi
 * †Meristina
 * †Meristina clairensis
 * Metacoceras discoideum 01.jpg †[[Metacoceras]]
 * †Metacromyocrinus
 * †Metacromyocrinus gillumi
 * †Metadimorphoceras
 * †Metadimorphoceras subdivisum
 * †Metutharocrinus
 * †Metutharocrinus cockei – type locality for species
 * †Michelinia
 * †Michelinia macerimuris – type locality for species
 * †Michelinia meekana
 * †Michelinia tenuicula
 * †Michelinoceras
 * †Michelinoceras wapanuckense
 * †Microcheilinella – tentative report
 * †Mitorthoceras
 * †Mitorthoceras crebriliratum
 * †Mitorthoceras girtyi – type locality for species
 * †Mitorthoceras perfilosum
 * †Mitorthoceras yellvillense – type locality for species
 * †Monoceratina
 * †Mooreoceras
 * †Mooreoceras wedingtonianum – type locality for species
 * †Mourlonia
 * †Mourlonia lativittata
 * †Muensteroceras
 * †Muensteroceras arkansanum – type locality for species
 * †Muensteroceras collinsoni – type locality for species
 * †Muensteroceras pisiforme – type locality for species
 * †Multithecopora
 * †Myalina
 * †Myalina parallela – or unidentified comparable form

N

 * †Naiadites – tentative report
 * Neritopsidae - Naticopsis.JPG †[[Naticopsis]]
 * †Naticopsis clinovata – or unidentified comparable form
 * †Naticopsis genevievensis
 * †Neochonetes
 * †Neoglyphioceras
 * †Neoglyphioceras caneyanum
 * †Neoglyphioceras crebriliratum
 * †Nostocites
 * †Nucleospira
 * †Nucleospira raritas
 * †Nuculavus
 * †Nuculavus okawensis
 * †Nuculopsis
 * †Nuculopsis shumardana

O

 * †Ogygoceras
 * †Ogygoceras gracile
 * †Onychotreta
 * †Onychotreta lenta
 * †Onychotreta mesleri
 * †Onychotreta miseri
 * †Onychotreta multiplicata
 * †Onychotreta plicata
 * †Orbiculoidea
 * †Orospira
 * †Orospira elegantula
 * †Orthobairdia
 * †Orthobairdia cestriensis
 * †Orthonychia
 * †Orthonychia compressum
 * †Orthonychia ungula
 * †Orthostrophella
 * †Orthostrophella clairensis
 * †Orthotetes
 * †Ortonella – tentative report
 * †Ortonella kershopensis
 * †Ovatia
 * †Oxoplecia
 * †Oxoplecia infrequens
 * †Ozarcus – type locality for genus
 * †Ozarcus mapesae – type locality for species

P

 * †Pachylyroceras
 * †Pachylyroceras cloudi
 * †Pachylyroceras newsomi
 * †Paladin
 * †Paladin mucronatus
 * †Palaeacis
 * †Palaeacis carinata
 * †Palaeocapulus
 * †Palaeocapulus undata
 * †Palaeoneilo
 * †Palaeoneilo sera
 * †Paleoconus
 * †Paleoconus bakeri – type locality for species
 * †Paleyoldia
 * †Paleyoldia angustia – type locality for species
 * †Paleyoldia bruta – type locality for species
 * †Palmerocrinus
 * †Palmerocrinus kesslerensis – type locality for species
 * †Paracravenoceras
 * †Paracravenoceras ozarkense – type locality for species
 * †Paracromyocrinus
 * †Paracromyocrinus oklahomensis
 * †Paradimorphoceras
 * †Paralegoceras
 * †Paralegoceras iowense
 * †Paralegoceras texanum
 * †Parallelodon
 * †Parallelodon cancellosus – or unidentified comparable form
 * †Paramphicrinus
 * †Paramphicrinus magnus – type locality for species
 * †Paraparchites – tentative report
 * †Paraparchites cyclopeus
 * †Parastrophinella
 * †Parastrophinella lepida
 * †Parvaxon
 * †Parvaxon minutum
 * †Patellilabia
 * †Patellilabia laevigata
 * †Patellilabia rhombadella – type locality for species
 * †Patellilabia sulcata – type locality for species
 * Pentremites Glen Dean Fm KY.jpg †[[Pentremites]]
 * †Pericyclus
 * †Perigrammoceras
 * †Perimestocrinus
 * †Perimestocrinus teneris
 * †Peripetoceras
 * †Peripetoceras ozarkense – type locality for species
 * †Permophorus
 * †Phaneroceras
 * †Phaneroceras compressum
 * †Phaneroceras kesslerense – type locality for species
 * †Pharkidonotus
 * †Phestia
 * †Phestia corrugata – type locality for species
 * †Phestia obtusa – type locality for species
 * †Phestia wortheni – type locality for species
 * †Phricodothyris
 * †Pilosisporites
 * †Pilosisporites williamsii
 * †Pionoceras
 * †Pionoceras smithvillense
 * †Placotriplesia
 * †Placotriplesia juvenis
 * †Placotriplesia praecipta
 * PlatycerasLoganOhio.jpg †[[Platyceras]]
 * †Platyceras latum
 * †Platyceras oxynotum – type locality for species
 * †Plectatrypa
 * †Plectatrypa arctoimbricata
 * †Plectodonta – tentative report
 * †Plicochonetes
 * †Plicocyrtia
 * †Plicocyrtia arkansana
 * †Polidevcia
 * †Polidevcia stevensiana
 * †Posidonia
 * †Posidonia nasuta
 * †Productina
 * †Productina sampsoni
 * †Productus
 * Proetus concinnus reconstruction cropped.png †[[Proetus (trilobite)|Proetus]]
 * †Proetus vaningeni
 * †Prolecanites
 * †Prolecanites lyoni – or unidentified comparable form
 * †Proshumardites
 * †Proshumardites morrowanus
 * †Prospira
 * †Prospira latior
 * †Prothyris
 * †Prothyris crista – type locality for species
 * †Prothyris soleniformis – or unidentified comparable form
 * †Protocycloceras
 * †Protocycloceras arkansaense
 * †Protocycloceras smithvillense
 * †Pseudagnostus
 * †Pseudagnostus communis
 * †Pseudokingstonia
 * †Pseudokingstonia exotica
 * †Pseudopronorites
 * †Pseudopronorites arkansiensis
 * †Pseudopronorites quinni
 * †Pseudorthoceras
 * †Pseudorthoceras knoxense
 * †Pseudorthoceras stonense – type locality for species
 * †Pseudozygopleura
 * †Pterocephalia
 * †Pterocephalia sanctisabae
 * †Ptychomphalina
 * †Ptychomphalina magna – type locality for species
 * †Punctospirifer
 * †Pycnoceras
 * †Pycnoceras clausum
 * †Pygmaeoceras
 * †Pygmaeoceras solidum

Q

 * †Quinnites
 * †Quinnites henbesti
 * †Quinnites textum

R

 * †Radnoria
 * †Ramosites
 * †Raphiophorus
 * †Raphiophorus niagarensis
 * †Rayonnoceras
 * †Rayonnoceras eccentricum – type locality for species
 * †Rayonnoceras fayettevillense
 * †Rayonnoceras irregulare – or unidentified comparable form
 * †Rayonnoceras nobile – or unidentified comparable form
 * †Rayonnoceras protentum – type locality for species
 * †Rayonnoceras solidiforme
 * †Rayonnoceras vaughanianum
 * †Rectangulina
 * †Resserella
 * †Reticulariina
 * †Reticuloceras
 * †Reticuloceras tiro
 * †Reticuloceras wainwright
 * †Reticuloceras wainwrighti
 * †Reticycloceras
 * †Reticycloceras croneisi – type locality for species
 * †Reticycloceras girtyi – type locality for species
 * †Reticycloceras peytonense – type locality for species
 * †Reticycloceras sequoyahense
 * †Retispira
 * †Retispira cincta
 * †Retispira ordinata – or unidentified related form
 * †Retispira yochelsoni – type locality for species
 * †Retites
 * †Retites semiretia
 * †Reviya
 * †Reviya planus – or unidentified related form
 * †Rhipidomella
 * †Rhynchopora
 * †Rhytiophora
 * †Rhytiophora blairi
 * †Richardsonites
 * †Richardsonites richardsonianum
 * †Richardsonites richardsonianus
 * †Roundyella
 * †Roundyella simplex

S

 * †Sandia
 * †Sanguinolites
 * †Sanguinolites simulans – tentative report
 * †Sansabella
 * †Sansabella fayettevillensis
 * †Sansabella reticulata
 * †Savitrisporites
 * †Savitrisporites nux
 * †Schartymites
 * †Schartymites paynei
 * †Schellwienella
 * †Schizodus
 * †Schizodus chesterensis
 * †Schizophoria
 * †Schuchertella
 * †Schulzospora
 * †Schulzospora rara
 * †Schumardella
 * †Schumardella obsolecens
 * †Sedenticellula
 * †Sedgwickia
 * †Seminolites
 * †Septatrypa
 * †Septatrypa havliceki
 * †Septimyalina
 * †Septimyalina perattenuata – or unidentified comparable form
 * †Serenida
 * †Serenida seminalis
 * †Shaleria
 * †Solenochilus
 * †Solenochilus floweri – type locality for species
 * †Solenochilus peculiare – or unidentified comparable form
 * †Solenomorpha
 * †Solenomorpha nitida
 * †Spathelopsis – type locality for genus
 * †Spathelopsis browni – type locality for species
 * Cheiruridae - Sphaerexochus mirus cropped.jpg †[[Sphaerexochus]]
 * †Sphaerexochus glaber – type locality for species
 * †Sphenotus
 * †Sphenotus branneri
 * †Sphenotus dubius
 * †Sphenotus meslerianus
 * †Sphenotus pisinnus – type locality for species
 * †Sphenotus washingtonensis
 * Spirifer perlamosus pedunculate valve.jpg †[[Spirifer]]
 * †Spiriferellina
 * †Staurocephalus
 * †Staurocephalus lagena – type locality for species
 * †Staurocephalus oarion – type locality for species
 * †Stearoceras
 * †Stearoceras gibbosum – or unidentified related form
 * †Stearoceras smithi – type locality for species
 * †Stenoglaphyrites
 * †Stenoglaphyrites involutus – type locality for species
 * †Stenoglaphyrites miseri – type locality for species
 * †Stenopronorites
 * †Sthenarocalymene
 * †Sthenarocalymene scutula – type locality for species
 * Lycopsid joggins mcr1.JPG †[[Stigmaria]]
 * †Stigmaria wedingtonensis
 * †Stioderma
 * †Stioderma hadra – type locality for species
 * †Streptis
 * †Streptis glomerata
 * †Streptorhynchus
 * †Strobeus
 * †Stroboceras
 * †Stroboceras gordoni – type locality for species
 * †Stroboceras sulcatum – or unidentified comparable form
 * †Sudeticeras
 * †Sulcella
 * †Sulcogirtyoceras
 * †Sulcogirtyoceras jasperense – type locality for species
 * †Sulcogirtyoceras limatum
 * †Sutherlandia
 * †Syngastrioceras
 * †Syngastrioceras globosum
 * †Syngastrioceras oblatum
 * †Syngastrioceras scotti
 * †Syntrophopsis
 * †Syntrophopsis grandis – type locality for species

T

 * †Tectamichelina – type locality for genus
 * †Tectamichelina mangeri – type locality for species
 * †Teiichispira
 * †Teiichispira odenvillensis
 * †Tesuquea
 * †Tetracamera
 * †Tetratylis – tentative report
 * †Tetratylus – tentative report
 * †Torynifer
 * †Trepspira
 * †Trepspira tentative report type locality for species – informal
 * †Triboloceras – tentative report
 * †Tripteroceroides – tentative report
 * Trypanites02.jpg [[Trypanites]]
 * †Tylonautilus
 * †Tylonautilus gratiosus

U

 * †Utharocrinus
 * †Utharocrinus pentanodus

V

 * †Valhallites
 * †Valhallites ornatus – type locality for species
 * †Valhallites tuberculatus – type locality for species
 * †Valhallites westforkensis – type locality for species
 * †Verneuilites
 * †Verneuilites pygmaeus
 * †Virgaspongia – type locality for genus
 * †Virgaspongia ichnata – type locality for species
 * †Virginiata
 * †Virginiata arkansana
 * †Voiseyella
 * †Vorticina
 * †Vorticina venata

W

 * †Wichitoceras
 * †Wichitoceras compressum
 * †Wiedeyoceras
 * †Wiedeyoceras williamsi – type locality for species
 * †Wilkingia
 * †Wilkingia inflata – or unidentified comparable form
 * †Winslowoceras
 * †Winslowoceras henbesti – type locality for species

X

 * †Xenocheilos
 * †Xenocheilos minutum

Y

 * †Yochelsonospira
 * †Yochelsonospira tenuilineata

Z

 * †Zaphrentites
 * †Zaphrentites arkansanus
 * †Zia
 * †Zygopleura – report made of unidentified related form or using admittedly obsolete nomenclature