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.

• †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

• 

  †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
  • †Aviculopecten inspeciosus
  • †Aviculopecten jennyi
  • †Aviculopecten morrowensis
  • †Aviculopecten squamula
• † Avonia
  • †Avonia honeycreekensis
• †Axinolobus
  • †Axinolobus modulus – type locality for species

• †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

• †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

• 

  †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

• 

  †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

• †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
  • †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

• 

  †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

• †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
  • †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

• 

  †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
  • †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

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

• †Garwoodia – tentative report
• †Gastrioceras
  • †Gastrioceras adaense
  • †Gastrioceras fittsi
  • †Gastrioceras formosum – type locality for species

• 

  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 – 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

• †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

• †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

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

• †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

• †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

• †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
• †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

• †Naiadites – tentative report

• 

  †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

• †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

• †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
• †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

• 

  †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
  • †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

• †Quinnites
  • †Quinnites henbesti
  • †Quinnites textum

• †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

• †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

• 

  †Sphaerexochus
  • †Sphaerexochus glaber – type locality for species
• †Sphenotus
  • †Sphenotus branneri
  • †Sphenotus dubius
  • †Sphenotus meslerianus
  • †Sphenotus pisinnus – type locality for species
  • †Sphenotus washingtonensis

• 

  †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

• 

  †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

• †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

• 

  Trypanites
• †Tylonautilus
  • †Tylonautilus gratiosus

• †Utharocrinus
  • †Utharocrinus pentanodus

• †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

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

• †Xenocheilos
  • †Xenocheilos minutum

• †Yochelsonospira
  • †Yochelsonospira tenuilineata

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

• Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 17 December 2021.