List of the Paleozoic life of Illinois

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

A

 * †Acantherpestes
 * †Acantherpestes inequalis – type locality for species
 * †Acantherpestes major – type locality for species
 * †Acanthoparypha
 * †Acanthoparypha subcircularis
 * †Acanthopecten
 * †Acanthopecten carboniferus
 * †Acanthotriletes
 * †Acanthotriletes aculeolatus
 * †Acanthotriletes dimorphus
 * †Achatella
 * †Achatella katharina
 * †Acrocrinus
 * †Acrocrinus constrictus
 * †Actinoceras
 * †Actinopteria
 * †Actinopteria boydi
 * †Adeloblatta
 * †Adeloblatta columbiana – type locality for species
 * †Adeloblatta sellardsi
 * †Adeloneura – type locality for genus
 * †Adeloneura thompsoni – type locality for species
 * †Adiaphtharsia – type locality for genus
 * †Adiaphtharsia ferrea – type locality for species
 * †Adiphlebia – type locality for genus
 * †Adiphlebia lacoana – type locality for species
 * †Adolarryia – type locality for genus
 * †Adolarryia bairdi – type locality for species
 * †Aenigmatodes – type locality for genus
 * †Aenigmatodes danielsi – type locality for species
 * †Aetophlebia – type locality for genus
 * †Aetophlebia singularis – type locality for species
 * †Agogoblattina
 * †Agogoblattina occidua – type locality for species
 * †Ahrenisporites
 * †Ahrenisporites guerickei
 * †Ahrensisporites
 * †Ahrensisporites guerickei
 * †Alanympha – type locality for genus
 * †Alanympha richardsoni – type locality for species
 * †Alatisporites
 * †Alatisporites hexalatus
 * †Alatisporites punctatus
 * †Alatisporites trialatus
 * Exhibit Museum of Natural History, Ann Arbor - IMG 9195.JPG †[[Alethopteris]]
 * †Alethopteris decurrens
 * †Alethopteris lonchitica
 * †Alethopteris owenii
 * †Alethopteris serlii
 * †Allagecrinus
 * †Allagecrinus mccraneyensis – type locality for species
 * †Alloiopteris
 * †Alloiopteris gracillima
 * †Alloiopteris quercifolia – or unidentified comparable form
 * †Alloiopteris sternbergi
 * †Allosocrinus
 * †Allosocrinus bronaughi
 * †Amarixys
 * †Amarixys gracilis – type locality for species
 * †Amarixys stellaris – type locality for species
 * †Amarixys sulcata – type locality for species
 * †Amaurotoma
 * †Amaurotoma leavenworthana
 * †Ambocoelia
 * †Ambocoelia louisianaensis
 * †Ambocoelia minuta
 * †Ambonychia – tentative report
 * †Ametretus – type locality for genus
 * †Ametretus laevis – type locality for species
 * †Ameura
 * †Amousus – type locality for genus
 * †Amousus mazonus – type locality for species
 * Amphibamus BW.jpg †[[Amphibamus]] – type locality for genus
 * †Amphibamus grandiceps – type locality for species
 * †Amphicoelia
 * †Amphilichas
 * †Amphilichas subdisjunctus
 * †Amphiscapha
 * †Amphiscapha subrugosa
 * †Amplexizaphrentis
 * †Amplexizaphrentis spinulosus
 * †Amynilyspes – type locality for genus
 * †Amynilyspes wortheni – type locality for species
 * †Anaphragma
 * †Anaphragma mirabile
 * †Anapiculatisporites
 * †Anapiculatisporites grundensis
 * †Anapiculatisporites spinosus
 * †Anastrophia
 * †Anegertus – type locality for genus
 * †Anegertus cubitalis – type locality for species
 * †Anematina
 * †Anematina proutana
 * †Anepitedius – type locality for genus
 * †Anepitedius giraffa – type locality for species
 * Annularia Stellata.jpg †[[Annularia]]
 * †Annularia asteris – or unidentified comparable form
 * †Annularia cuspidata
 * †Annularia stellata
 * †Annularia vernensis – or unidentified comparable form
 * †Anobasicrinus
 * †Anobasicrinus brevis – type locality for species
 * †Anomphalus – type locality for genus
 * †Anomphalus rotulus – type locality for species
 * †Anthracoceras
 * †Anthracoceras wanlessi – type locality for species
 * †Anthracophausia
 * †Anthracophausia ingelsorum
 * †Anthracoscorpio – tentative report
 * †Anthracospirifer
 * †Anthracospirifer leidyi
 * †Anthracothremma – type locality for genus
 * †Anthracothremma robusta – type locality for species
 * †Anthrakoris – type locality for genus
 * †Anthrakoris aetherius – type locality for species
 * †Antiquatonia
 * †Antiquatonia portlockianus – or unidentified comparable form
 * †Antirhynchonella
 * †Antirhynchonella ventricosa – or unidentified comparable form
 * †Aphantomartus
 * †Aphantomartus pustulatus – type locality for species
 * †Apiculatasporites
 * †Apiculatasporites latigranifer
 * †Apiculatasporites setulosus
 * †Apiculatasporites spinososaetosus
 * †Apiculatasporites variocorneus
 * †Apiculatasporites variusetosus
 * †Apiculatisporites
 * †Apiculatisporites abditus
 * †Apiculatisporites frequentisporites
 * †Apiculatisporites lappites
 * †Apiculatisporites setulosus
 * †Apithanus – type locality for genus
 * †Apithanus jocularis – type locality for species
 * †Apographiocrinus
 * †Apographiocrinus typicalis
 * †Archaeocalamites
 * †Archaeocalamites radiatus
 * †Archaeocalyptocrinus
 * †Archaeocalyptocrinus obconicus
 * †Archaeocidaris – tentative report
 * †Archaeologus – type locality for genus
 * †Archaeologus falcatus – type locality for species
 * †Archaeopteris
 * †Archaeopteris stricta
 * Fenestellidae - Archimedes species.JPG]] †Archimedes''
 * †Archimedes communis
 * †Archimedes compactus
 * †Archimedes invaginatus
 * †Archimedes lativolvis
 * †Archimedes macfarlani
 * †Archimedes swallovanus
 * †Archimedes terebriformis
 * †Archimylacris
 * †Archimylacris paucinervis – type locality for species
 * †Archisymplectes – type locality for genus
 * †Archisymplectes rhothon – type locality for species
 * †Architarbus – type locality for genus
 * †Architarbus minor – type locality for species
 * †Architarbus rotundatus – type locality for species
 * †Archiulus – tentative report
 * †Archiulus glomeratus – type locality for species
 * †Archoblattina – type locality for genus
 * †Archoblattina beecheri – type locality for species
 * †Archoblattina scudderi – type locality for species
 * †Arctinurus
 * †Arctinurus boltoni
 * †Arctinurus chicagoensis
 * †Argentiproductus
 * †Argentiproductus auriculatus
 * Arthrolycosa antiqua, Beecher illustration.jpg †[[Arthrolycosa]] – type locality for genus
 * †Arthrolycosa antiqua – type locality for species
 * †Arthrolycosa danielsi – type locality for species
 * †Arthropitys
 * †Arthropitys communis
 * †Artisia
 * †Artisia transversa
 * †Asemoblatta
 * †Asemoblatta danielsi – type locality for species
 * †Asemoblatta mazona – type locality for species
 * †Asinomphalus
 * †Asinomphalus antiqua
 * †Asolanus
 * †Asolanus camptotaenia
 * †Astartella
 * †Astartella compacta
 * †Astartella concentrica
 * †Asterophyllites
 * †Asterophyllites equisetiformis – or unidentified comparable form
 * †Asterophyllites longifolius
 * †Asterophyllites multifolia
 * †Asterotheca
 * †Asterotheca miltoni – or unidentified comparable form
 * †Astraeospongium
 * †Asyncritus – type locality for genus
 * †Asyncritus reticulatus – type locality for species
 * †Athyris
 * †Athyris vittata
 * Atrypa reticularis pedunculate Gondelsheim CRF.jpg †[[Atrypa]]
 * †Atrypa putilla
 * †Atrypa reticularis – report made of unidentified related form or using admittedly obsolete nomenclature
 * †Aulacotheca
 * †Aulertupus – type locality for genus
 * †Aulertupus tembrocki – type locality for species
 * †Aviculopecten
 * †Aviculopecten fasciculatus
 * † Avonia
 * †Avonia pyidata
 * †Axiodeaneia
 * †Axiodeaneia glenparkensis
 * †Axiologus – type locality for genus
 * †Axiologus thoracicus – type locality for species

B

 * †Balteosporites
 * †Balteosporites minutus
 * †Bandringa – type locality for genus
 * †Bandringa herdinae – type locality for species
 * †Bandringa rayi – type locality for species
 * †Bassleroceras
 * †Bassleroceras lasallense
 * †Baylea
 * †Baylea minuta – type locality for species
 * †Baylea sinuatus – type locality for species
 * †Baylea subconstricta – type locality for species
 * †Beecheria
 * †Beecheria illinoisense
 * †Beecheria paraplicata
 * †Belemnospongia
 * †Belemnospongia parmula
 * Bellerophon umbilicalis.jpg †[[Bellerophon (genus)|Bellerophon]]
 * †Bellerophon chesterensis – type locality for species
 * †Bellerophon incomptus – type locality for species
 * †Bellerophon spergensis
 * †Bellerophon stevensianus
 * †Bellerophon tenuilineata – type locality for species
 * †Belinurus
 * †Belinurus lacoei – type locality for species
 * †Bembexia
 * †Bembexia gradilispira – type locality for species
 * †Beyrichiella
 * †Beyrichiella confluens
 * †Bicarina
 * †Bicarina petilitornata
 * †Bighornia
 * †Bighornia patella – or unidentified comparable form
 * †Bizarrea – type locality for genus
 * †Bizarrea obscura – type locality for species
 * †Blattoidea
 * †Blattoidea anceps – type locality for species
 * †Blattoidea carri – type locality for species
 * †Blattoidea melanderi
 * †Blattoidea schuchertiana – type locality for species
 * †Blattoidea sellardsiana – type locality for species
 * †Brabeocrinus – type locality for genus
 * †Brabeocrinus christinae – type locality for species
 * †Brachycycloceras
 * †Brachycycloceras normale
 * Brachydectes.jpg †[[Brachydectes]]
 * †Brachydectes newberryi
 * †Brachythyris
 * †Brachythyris hortonensis
 * †Brevilamnulella – tentative report
 * †Brevilamnulella thebesensis
 * †Bucania
 * †Bucania batchtownensis – type locality for species
 * †Bulimorpha
 * †Bulimorpha minor
 * †Bulimorpha whitfieldi – type locality for species
 * †Bumastoides
 * †Bumastoides billingsi
 * Bumastus ioxus cropped.jpg †[[Bumastus]]
 * †Bumastus armata
 * †Bumastus armatus – or unidentified comparable form
 * †Bumastus chicagoensis
 * †Bumastus cuniculus – or unidentified comparable form
 * †Bumastus graftonensis
 * †Bumastus insignis
 * †Bumastus springfieldensis
 * †Bumastus transversalis
 * †Buthiscorpius
 * †Buthiscorpius lemayi – type locality for species

C

 * †Cacurgus – type locality for genus
 * †Cacurgus spilopterus – type locality for species
 * †Cadiospora
 * †Cadiospora fithiana
 * †Cadiospora magna
 * Calamites stems.JPG †[[Calamites]]
 * †Calamites cistiiformis – or unidentified comparable form
 * †Calamites rectangularis
 * †Calamites suckowii
 * †Calamocarpon
 * †Calamocarpon insignis
 * †Calamodendron
 * †Calamodendron americanum
 * †Calamospora
 * †Calamospora breviradiata
 * †Calamospora flava
 * †Calamospora flexilis
 * †Calamospora hartungiana
 * †Calamospora liquida
 * †Calamospora minuta
 * †Calamospora mutabilis
 * †Calamospora pedata
 * †Calamospora straminea
 * †Calamostachys
 * †Calamostachys americana
 * †Calamostachys andanensis
 * †Calamostachys inversibractis – type locality for species
 * †Calceocrinus
 * †Calliasterella
 * †Calliasterella americana
 * †Calliocrinus
 * †Calliocrinus cornatus
 * †Calliocrinus cornutus
 * †Calliocrinus pentangularis
 * Callipteridium fossil cropped.png †[[Callipteridium]]
 * †Calvinia
 * †Calvinia edgewoodensis
 * †Calymene
 * †Calymene breviceps
 * †Calymene celebra
 * †Calyptaulax
 * †Calyptaulax callicephala
 * †Camarophorella
 * †Camarophorella buckleyi – or unidentified comparable form
 * †Camarotoechia
 * †Camerella
 * †Camptotriletes
 * †Camptotriletes bucculentus
 * †Camptotriletes triangularis
 * †Cancrinella
 * †Cancrinella boonensis
 * †Cannophyllites
 * †Cannophyllites abbreviata
 * †Cannophyllites dawsoni
 * †Cannophyllites fasciculata
 * †Cannophyllites marginata
 * †Cannophyllites rectinervis
 * †Cannophyllites southwelli
 * †Carbonocoryphe
 * †Carbonocoryphe planucauda
 * †Carbonympha – type locality for genus
 * †Carbonympha herdinai – type locality for species
 * †Cardiocarpon
 * †Cardiopteridium
 * †Cardiothyris
 * †Cardiothyris pristina
 * †Carpocrinus
 * †Caryocrinites
 * †Caryocrinites ornatus – or unidentified comparable form
 * Caseodus cropped.png †[[Caseodus]]
 * †Caseodus basalis – type locality for species
 * †Catadyesthus
 * †Catadyesthus priscus
 * †Caulopteris
 * †Cephalerpeton – type locality for genus
 * †Cephalerpeton ventriarmatum – type locality for species
 * †Ceratiocaris
 * †Ceratiocaris markhami
 * †Ceratocephala
 * †Ceratocephala goniata
 * †Ceraurinella
 * †Ceraurinella tenuisculptus
 * †Ceraurinus
 * †Ceraurinus platycanthus
 * †Cerauromerus
 * †Cerauromerus hydei
 * Ceraurus fossil cropped.png †[[Ceraurus]]
 * †Ceraurus globulobatus
 * †Ceraurus pleurexanthemus
 * †Cervifurca
 * †Cervifurca nasuta
 * †Chaenomya
 * †Chaetetes
 * †Cheirurus
 * †Cheirurus niagarensis – or unidentified comparable form
 * †Cheirurus patens
 * †Cheliphlebia – type locality for genus
 * †Cheliphlebia carbonaria – type locality for species
 * †Cheliphlebia mazona – type locality for species
 * †Chenilleophycus
 * †Chenilleophycus godfreyensis
 * †Chicagocrinus
 * †Chicagocrinus ornatus
 * †Chirodus
 * †Chirodus orbicularis
 * †Chlidonocrinus
 * †Chlidonocrinus erectus – type locality for species
 * †Chlidophorus
 * †Chonetes
 * †Chonetes ornatus
 * †Chonetinella
 * †Chrestotella
 * †Chrestotella danae – type locality for species
 * †Chrestotes – type locality for genus
 * †Chrestotes lapidea – type locality for species
 * †Cirratriradites
 * †Cirratriradites annulatus
 * †Cirratriradites annuliformis
 * †Cirratriradites tenuis
 * †Clathrocrinus – type locality for genus
 * †Clathrocrinus clathratus – type locality for species
 * †Clathrocrinus clinatus – type locality for species
 * †Clathrodictyon
 * †Clathrodictyon vesiculosum
 * †Clathrospira
 * †Clathrospira subconica
 * Cleiothyridina sublamellosa pedunculate valve.jpg †[[Cleiothyridina]]
 * †Cleiothyridina atrypoides
 * †Cleiothyridina sublamellosa
 * †Clepsydrops – type locality for genus
 * †Clepsydrops collettii – type locality for species
 * †Clepsydrops vinslovii – type locality for species
 * †Cliftonia
 * †Cliftonia tubulistriata
 * †Clonocrinus
 * †Clonocrinus chicagoensis
 * †Clonocrinus niagarensis
 * Coelacanthus cropped.png †[[Coelacanthus]]
 * †Coelacanthus exiguus
 * †Coelocystis
 * †Coelocystis subglobosus
 * †Columinisporites
 * †Columinisporites ovalis
 * †Complexisporites
 * †Complexisporites chalonerii
 * †Composita
 * †Composita argentea
 * †Composita matutina
 * †Composita subtilita
 * †Composita trinuclea
 * †Compsaster
 * †Compsaster formosus
 * †Condrathyris
 * †Condrathyris perplexa
 * †Conocardium
 * †Conocardium chesterensis – type locality for species
 * †Contocrinus
 * †Contocrinus coupi – type locality for species
 * †Converrucosisporites
 * †Converrucosisporites subverrucosus
 * †Convolutispora
 * †Convolutispora florida
 * †Convolutispora fromensis
 * †Cooperoceras
 * †Cordaianthus
 * †Cordaicarpus
 * †Cordaicladus
 * Cordaites fossil cropped.png †[[Cordaites]]
 * †Cordaites communis
 * †Cordaites principalis
 * †Cornulites
 * †Corynepteris
 * †Corynepteris erosa – or unidentified comparable form
 * †Crania
 * †Crania dodgei
 * †Craniops
 * †Crassiproetus
 * †Crassiproetus occidens
 * †Crassispora
 * †Crassispora kosankei
 * †Crassispora plicata
 * Cricotus crassidens.JPG †[[Cricotus]] – type locality for genus
 * †Cricotus heteroclitus – type locality for species
 * †Cristatisporites
 * †Cristatisporites alpernii
 * †Cristatisporites indignabundus
 * †Crossotheca
 * †Crotalocrinites
 * †Crotalocrinites cora
 * †Crotalocrinites vanhornei
 * †Crurithyris
 * †Crurithyris levicula – or unidentified comparable form
 * †Crurithyris planoconvexa
 * †Cryptothyrella
 * †Cryptothyrella ovoides
 * Ctenacanthus major Agassiz.png †[[Ctenacanthus]]
 * †Ctenacanthus buttersi – type locality for species
 * †Ctenodonta
 * †Ctenodonta concinna
 * †Curculioides
 * †Curculioides gigas – type locality for species
 * †Curculioides mcluckiei – type locality for species
 * †Curculioides scaber – type locality for species
 * †Curriella – tentative report
 * †Cyathocrinites
 * †Cyclites
 * †Cyclites globosa – type locality for species
 * †Cyclogranisporites
 * †Cyclogranisporites aureus
 * †Cyclogranisporites breviradiata
 * †Cyclogranisporites breviradiatus
 * †Cyclogranisporites leopoldi
 * †Cyclogranisporites micaceus
 * †Cyclogranisporites microgranus
 * †Cyclogranisporites minutus
 * †Cyclogranisporites obliquus
 * †Cyclogranisporites orbicularis
 * †Cyclogranisporites staplini
 * †Cyclonema
 * †Cyclonema daytonensis
 * †Cyclonema intermedium
 * †Cyclus
 * †Cyclus americanus – type locality for species
 * †Cymatospira
 * †Cymatospira welleri
 * †Cyperites
 * †Cyphaspis
 * †Cyphaspis globosus
 * †Cyphaspis intermedia
 * †Cyphocrinus
 * †Cyphocrinus chicagoensis
 * †Cypricardella
 * †Cypricardella bellistriata
 * †Cyrtia
 * Cyrtoceras NT small.jpg †[[Cyrtoceras]]
 * Cytherella
 * †Cytherella glandella
 * †Cytherellina
 * †Cytherodon – tentative report
 * †Cytherodon appresus
 * †Cytocrinus

D

 * †Dabasacanthus – type locality for genus
 * †Dabasacanthus inskasi – type locality for species
 * †Dactylotheca
 * †Dactylotheca aspera
 * †Dalejina
 * †Dalmanella
 * †Dalmanella edgewoodensis
 * SilurianTrilobite.jpg †[[Dalmanites]]
 * †Dalmanites danai
 * †Dalmanites illinoisensis
 * †Dalmanites obex
 * †Dalmanites platycaudatus
 * †Danielsiella – type locality for genus
 * †Danielsiella priscula – type locality for species
 * †Dasciocrinus
 * †Dasciocrinus spinifer
 * †Dasyleptus
 * †Dawsonoceras
 * †Decoroproetus
 * †Deiphon
 * †Deiphon americanus
 * †Delicaster – type locality for genus
 * †Delicaster enigmaticus
 * †Delthyris
 * †Deltoidospora
 * †Deltoidospora levis
 * †Deltoidospora priddyi
 * †Deltoidospora sphaerotriangula
 * †Denayella
 * †Denayella rotalia – or unidentified comparable form
 * †Densosporites
 * †Densosporites annulatus
 * †Densosporites lobatus – or unidentified comparable form
 * †Densosporites ruhus
 * †Densosporites sinuosus
 * †Densosporites sphaerotriangularis
 * †Densosporites triangularis
 * †Derbyia
 * †Derbyia crassa
 * †Derbyoides
 * †Derbyoides nebrascensis
 * †Desmograptus
 * †Desmograptus micronematodes
 * †Desmopteris
 * †Devonatrypa
 * †Devononema – type locality for genus
 * †Devononema typicum – type locality for species
 * †Diagonodictya – type locality for genus
 * †Diagonodictya crusta – type locality for species
 * †Diamphidiocystis
 * †Diamphidiocystis drepanon
 * †Diaphorodendron
 * †Diaphorodendron rimosum
 * †Diaphragmus
 * †Diaphragmus fasciculatus
 * †Dicalamophyllum
 * †Dicalamophyllum americanum
 * †Dichocrinus
 * †Dichocrinus nola – type locality for species
 * †Dicksonites
 * †Dicoelosia
 * †Dicranopeltis
 * †Dicranopeltis decipiens
 * †Dictyoclostus
 * †Dictyoclostus inflatus
 * †Dictyomonolites
 * †Dictyomonolites swadei
 * †Dictyonema
 * †Dictyonema crassibasale
 * †Dictyonema retiforme
 * †Dictyonema tenellum
 * †Dictyophlois
 * †Dictyophlois reticulata var. illinoisensis
 * †Dictyotomaria
 * †Dictyotomaria depressus – type locality for species
 * †Dictyotomaria wortheni – type locality for species
 * †Dictyotomaria yochelsoni
 * †Dictyotriletes
 * †Dictyotriletes bireticulatus
 * †Dictyotriletes danvillensis
 * †Dictyotriletes densoreticulatus
 * †Dictyotriletes distortus
 * †Dictyotriletes falsus – or unidentified comparable form
 * †Dictyotriletes reticulocingulum – or unidentified comparable form
 * †Dictyoxylon – or unidentified comparable form
 * †Dieconeura – type locality for genus
 * †Dieconeura arcuata – type locality for species
 * †Dieconeura mazona – type locality for species
 * †Dielasmella
 * †Dielasmella compressa
 * †Diexodus – type locality for genus
 * †Diexodus debilis – type locality for species
 * †Dimerocrinites
 * †Dimerocrinites occidentalis
 * †Dimerocrinites pentangularis
 * †Dinobolus
 * Exhibit Museum of Natural History, Ann Arbor - IMG 9136.JPG †[[Diplocaulus]] – type locality for genus
 * †Diplocaulus salamandroides – type locality for species
 * †Diplothmema
 * †Diplothmema cheathami
 * †Discotarbus – type locality for genus
 * †Discotarbus deplanatus – type locality for species
 * †Distortitisporites
 * †Distortitisporites illinoiensis
 * †Ditomopyge
 * †Ditomopyge scitula
 * †Dolichoharpes
 * †Dolichoharpes uniserialis
 * †Domatoceras
 * †Domatoceras mattoonense – type locality for species
 * †Domatoceras wortheni – type locality for species
 * †Donaldina
 * †Donaldina americana
 * †Donaldina fountainensis – type locality for species
 * †Donaldina marigoldensis
 * †Donaldina pygmaea – type locality for species
 * †Dorycrinus
 * †Dorycrinus mississippiensis
 * †Dragonympha – type locality for genus
 * †Dragonympha srokai – type locality for species
 * †Dudleyaspis
 * †Dudleyaspis vanhornei

E

 * †Echinaria
 * †Echinoconchus
 * †Echinoconchus alternatus
 * Edestus protopirata1DB.jpg †[[Edestus]]
 * †Edestus crenulatus – type locality for species
 * †Edestus serratus – type locality for species
 * †Edmondia
 * †Edmondia ovata
 * †Eileticus – type locality for genus
 * †Eileticus aequalis – type locality for species
 * †Eileticus anthracinus – type locality for species
 * †Elasmonema
 * †Elasmonema corrugata
 * †Elaterites
 * †Elaterites triferens
 * †Elibatocrinus
 * †Elibatocrinus elegans – type locality for species
 * Elonichthys Exhibit Museum of Natural History cropped.jpg †[[Elonichthys]]
 * †Elonichthys disjunctus – type locality for species
 * †Elonichthys peltigerus
 * †Elonichthys perpennatus
 * †Encrinurus
 * †Encrinurus egani
 * †Endelocrinus
 * †Endelocrinus tumidus
 * †Endoiasmus – type locality for genus
 * †Endoiasmus reticulatus – type locality for species
 * †Endosporites
 * †Endosporites globiformis
 * †Endosporites plicatus
 * †Enoploura
 * †Enteletes
 * †Enteletes hemiplicata
 * †Eoasinites
 * †Eobronteus
 * †Eobronteus slocomi
 * †Eoctonus – type locality for genus
 * †Eoctonus miniatus – type locality for species
 * †Eodictyonella
 * †Eohalysiocrinus – tentative report
 * †Eolissochonetes
 * †Eomartiniopsis
 * †Eomartiniopsis kinderhookensis
 * †Eophacops
 * †Eophacops handwerki
 * †Eoplectodonta
 * †Eoscorpius – type locality for genus
 * †Eoscorpius carbonarius – type locality for species
 * †Eospirifer
 * †Eospirifer radiatus
 * †Eospirigerina
 * †Eospirigerina putilla
 * †Eotrochus
 * †Eotrochus marigoldensis
 * †Ephippioceras
 * †Ephippioceras moinellae – type locality for species
 * †Epideigma – type locality for genus
 * †Epideigma elegans – type locality for species
 * †Eremopteris
 * †Eremopteris grandis
 * †Eremopteris inaequilateralis
 * †Erisocrinus
 * †Erisocrinus typus
 * †Erratencrinurus
 * †Erratencrinurus vigilans
 * †Escharopora
 * †Escharopora patens
 * †Eubleptus – type locality for genus
 * †Eubleptus danielsi – type locality for species
 * †Eubleptus maculosus – type locality for species
 * †Eubrodia – type locality for genus
 * †Eubrodia dabasinskasi – type locality for species
 * †Eucaenus – type locality for genus
 * †Eucaenus ovalis – type locality for species
 * †Eucaenus pusillus – type locality for species
 * †Eucaenus rotundatus – type locality for species
 * EucalyptocrinitesCalyx.jpg †[[Eucalyptocrinites]]
 * †Eucalyptocrinites asper
 * †Eucalyptocrinites crassus
 * †Eucalyptocrinites depressus
 * †Eucalyptocrinites egani
 * †Eucalyptocrinites inornatus
 * †Eucalyptocrinites ornatus
 * †Eucalyptocrinites rotundus
 * †Euchondria
 * †Euchondria levicula
 * †Euconospira
 * †Euconospira sturgeoni
 * †Euconospira waterlooensis – type locality for species
 * †Eudoxina
 * †Eudoxina subrotunda
 * †Euhydrodiskos – type locality for genus
 * †Euhydrodiskos diktyotos – type locality for species
 * †Eumetria
 * †Eumetria vera
 * †Eumicrerpeton – type locality for genus
 * †Eumicrerpeton parvum – type locality for species
 * †Eunema
 * †Eunema centralis – type locality for species
 * †Eunema fasciata – type locality for species
 * Euomphalus fossil cropped.png †[[Euomphalus]]
 * †Euomphalus planodorsatus
 * †Euomphalus similis
 * †Euonychocrinus
 * †Euonychocrinus simplex – type locality for species
 * †Euphemerites
 * †Euphemerites affinis – type locality for species
 * †Euphemerites gigas – type locality for species
 * †Euphemerites simplex – type locality for species
 * †Euphemites
 * †Euphemites callosus – type locality for species
 * †Euphemites carbonarius
 * †Euphemites lentiformis – type locality for species
 * †Euphemites randolphensis – type locality for species
 * Euphoberia spinulosa.jpg †[[Euphoberia]] – type locality for genus
 * †Euphoberia anguilla – type locality for species
 * †Euphoberia armigera – type locality for species
 * †Euphoberia carri – type locality for species
 * †Euphoberia cuspidata – type locality for species
 * †Euphoberia flabellata – type locality for species
 * †Euphoberia granosa
 * †Euphoberia horrida – type locality for species
 * †Euphoberia hystricosa – type locality for species
 * †Euphoberia simplex – type locality for species
 * †Euphoberia spinulosa – type locality for species
 * †Euphoberia tracta – type locality for species
 * †Euryzone
 * †Euryzone latitornata
 * †Eusphenopteris
 * †Eusphenopteris morrowensis
 * †Exallaspis
 * †Exallaspis illinoisensis
 * †Exocrinus
 * †Exocrinus wanni
 * †Exoriocrinus – type locality for genus
 * †Exoriocrinus lasallensis

F

 * †Fasciculiconcha
 * †Fasciculiconcha knighti
 * FavositesOrdovicianIndiana.jpg †[[Favosites]]
 * †Fenestella
 * †Ferganella
 * †Fistulipora
 * †Fistulipora excellens
 * †Fistulipora incrustans
 * †Fistulipora perdensa
 * †Fletcheria
 * †Florinites
 * †Florinites antiquus
 * †Florinites grandis
 * †Florinites mediapudens
 * †Florinites mediaudens
 * †Florinites millotti
 * †Florinites similis
 * †Florinites triletus
 * †Florinites visendus
 * †Florinites volans
 * †Fraipontia
 * †Fraipontia bella – type locality for species

G

 * †Galateacrinus
 * †Galateacrinus coacervatus – type locality for species
 * †Gazacrinus
 * †Gazacrinus major
 * †Gazacrinus minor
 * †Genentomum – type locality for genus
 * †Genentomum validum – type locality for species
 * †Geralinura
 * †Geralinura carbonaria – type locality for species
 * †Gerapompus
 * †Gerapompus blattinoides – type locality for species
 * †Gerapompus extensus – type locality for species
 * †Gerapompus schucherti – type locality for species
 * †Geraroides
 * †Geraroides maximus – type locality for species
 * †Gerarulus – type locality for genus
 * †Gerarulus radialis – type locality for species
 * †Gerarus – type locality for genus
 * †Gerarus collaris – type locality for species
 * †Gerarus constrictus – type locality for species
 * †Gerarus danielsi – type locality for species
 * †Gerarus mazonus – type locality for species
 * †Gerarus vetus – type locality for species
 * †Geratarbus – type locality for genus
 * †Geratarbus lacoei – type locality for species
 * †Gigantopteris
 * †Gigantopteris dawsoni
 * †Gigantopteris ovata
 * †Girtyella
 * †Girtyella indianensis
 * †Girtyspira
 * †Girtyspira canaliculata
 * †Girtyspira pygmaea – type locality for species
 * †Gissocrinus
 * †Glabrocingulum
 * †Glabrocingulum chesterensis
 * †Glabrocingulum grayvillense
 * †Glaphyrophlebia – type locality for genus
 * †Glaphyrophlebia pusilla – type locality for species
 * Glikmanius occidentalis.jpg †[[Glikmanius]]
 * †Glikmanius occidentalis
 * †Globozyga
 * †Globozyga tenuistriata
 * †Glyptambon
 * †Glyptambon verrucosus
 * †Glyptopleura
 * †Glyptopleura costata
 * †Gomphocystites
 * †Gondolella
 * †Gondolella pohli
 * †Gonioloboceras
 * †Gonioloboceras parrishi – type locality for species
 * †Goniophora – tentative report
 * †Gosseletina
 * †Gosseletina johnsoni
 * †Gosseletina subglobosa
 * †Grabauphyllum
 * †Grabauphyllum johnstoni
 * †Graeophonus
 * †Graeophonus scudderi – type locality for species
 * †Granasporites
 * †Granasporites medius
 * †Granulatispoites
 * †Granulatispoites piroformis
 * †Granulatisporites
 * †Granulatisporites adnatoides
 * †Granulatisporites granularis
 * †Granulatisporites granulatus
 * †Granulatisporites livingstonensis
 * †Granulatisporites microgranifer
 * †Granulatisporites minutus
 * †Granulatisporites pallidus
 * †Granulatisporites pannosites
 * †Granulatisporites parvus – or unidentified comparable form
 * †Granulatisporites piroformis
 * †Granulatisporites verrucosus
 * †Greenops
 * Greererpeton DB2.jpg †[[Greererpeton]]
 * †Greererpeton burkmorani
 * †Griffithidella
 * †Griffithidella alternata
 * †Griffithidella doris
 * †Grumosisporites
 * †Grumosisporites rufus – or unidentified comparable form
 * †Grumosisporites varioreticulatus
 * †Gulpenia
 * †Gulpenia limburgensis
 * †Gypidula
 * †Gyrophlebia – type locality for genus
 * †Gyrophlebia longicollis – type locality for species

H
†Hyolithes
 * †Hadentomum – type locality for genus
 * †Hadentomum americanum – type locality for species
 * †Hadrachne – type locality for genus
 * †Hadrachne horribilis – type locality for species
 * †Haeretocrinus
 * †Haeretocrinus macoupinesis
 * †Haeretocrinus wagneri – type locality for species
 * †Hagnocrinus – tentative report
 * †Hagnocrinus dubius
 * †Hallicystis
 * †Hallicystis elongata
 * Hallopora multitabulata fossil bryozoan (Ordovician; Frankfort IL.jpg †[[Hallopora]] – tentative report
 * †Halogetocrinus – type locality for genus
 * †Halogetocrinus paucus
 * †Halysites
 * †Hamburgia
 * †Hamburgia typa
 * †Harmostocrinus – type locality for genus
 * †Harmostocrinus porosus – type locality for species
 * †Harpidella
 * †Harpidium
 * †Hebertella
 * †Hedeina
 * †Helenodora – type locality for genus
 * †Helenodora inopinata – type locality for species
 * †Helicotoma
 * †Helicotoma planulata
 * †Heliolites
 * †Heliomeroides
 * †Heliomeroides raymondi
 * †Hemeristia – type locality for genus
 * †Hemeristia occidentalis – type locality for species
 * †Hemiarges
 * †Herdina – type locality for genus
 * †Herdina mirificus – type locality for species
 * †Heslerodus
 * †Heslerodus divergens
 * †Hesperorthis
 * †Heteralosia
 * †Heteralosia beecheri
 * †Heterologus – type locality for genus
 * †Heterologus langfordorum – type locality for species
 * †Heterotarbus – type locality for genus
 * †Heterotarbus ovatus – type locality for species
 * †Hexacrinites
 * †Hexacrinites mississippiensis – type locality for species
 * †Holcospermum
 * †Holia
 * †Holia magnaspina
 * †Holocystites
 * †Holocystites alternatus
 * †Holocystites cylindricus
 * †Holocystites scutellatus – type locality for species
 * †Holocystites spangleri
 * †Holocystites sphaericus
 * †Homaloneura
 * †Homaloneura dabasinskasi – type locality for species
 * †Homocrinus – tentative report
 * †Homoeospira
 * †Homotelus
 * †Homotelus laeviurus
 * †Howellella
 * †Hustedia
 * †Hustedia marmoni
 * †Hybochilocrinus
 * †Hybochilocrinus americanus
 * †Hymenospora
 * †Hymenospora multirugosa
 * †Hymenospora paucirugosa
 * †Hyolithes striatus
 * †Hypergonia
 * †Hypergonia baldwinensis
 * †Hypergonia illinoiensis – type locality for species
 * †Hypergonia marvinwelleri
 * †Hypermegethes – type locality for genus
 * †Hypermegethes schucherti – type locality for species
 * †Hypselocrinus
 * †Hypselocrinus maccabei
 * †Hystrichopsydrax – type locality for genus
 * †Hystrichopsydrax sandersi – type locality for species
 * †Hystriculina
 * †Hystriculina texana

I

 * †Ianthinopsis – tentative report
 * †Icthyocrinus
 * †Icthyocrinus subangularis
 * †Illaenoides
 * †Illaenoides triloba
 * †Ilyodes
 * †Ilyodes divisa – type locality for species
 * †Ilyodes elongata – type locality for species
 * †Indospora
 * †Indospora boletus
 * †Indospora stewarti
 * †Ischadites
 * †Ischadites koenigi
 * †Isoallagecrinus
 * †Isoallagecrinus lasallensis – type locality for species
 * Isodectes obtusus.jpg †[[Isodectes]]
 * †Isodectes obtusus
 * †Isorophus – tentative report
 * †Isorthis
 * †Isotelus
 * †Isotelus gigas
 * †Isotelus maximus

J

 * †Jimpohlia – type locality for genus
 * †Jimpohlia erinacea – type locality for species
 * †Juresania
 * †Juresania symmetrica

K

 * †Kanabinocrinus – tentative report
 * †Kankakeea – type locality for genus
 * †Kankakeea grundyi – type locality for species
 * †Kaskia
 * †Kaskia chesterensis
 * †Kewaneesporites
 * †Kewaneesporites reticulatus
 * †Kewaneesporites reticuloides
 * Kionoceras doricum.JPG †[[Kionoceras]]
 * †Kitakamithyris
 * †Kitakamithyris cooperensis
 * †Kloedenella – tentative report
 * †Knorria
 * †Knorria imbricata – or unidentified comparable form
 * †Knoxisporites
 * †Knoxisporites rotatus
 * †Knoxisporites stephanephorus
 * †Knoxisporites triradiatus
 * †Kosankeisporites
 * †Kosankeisporites elegans
 * †Kosovopeltis
 * †Kozlowskia
 * †Kozlowskia splendens
 * †Kozlowskiella
 * †Kozlowskiella inexpectata – type locality for species
 * †Kronoscorpio
 * †Kronoscorpio danielsi – type locality for species
 * †Kustarachne – type locality for genus
 * †Kustarachne tenuipes – type locality for species
 * †Kutorginella
 * †Kutorginella lasallensis

L

 * †Lacoea
 * †Lacoea seriata
 * †Laevigatosporites
 * †Laevigatosporites desmoinensis
 * †Laevigatosporites desmoinesensis
 * †Laevigatosporites globosus
 * †Laevigatosporites medius
 * †Laevigatosporites minutus
 * †Laevigatosporites ovalis
 * †Laevigatosporites punctatus
 * †Laevigatosporites vulgaris
 * †Lagenospermum
 * †Lameereites – type locality for genus
 * †Lameereites curvipennis – type locality for species
 * †Lampterocrinus
 * †Lampterocrinus inflatus
 * †Larryia – type locality for genus
 * †Larryia osterbergi – type locality for species
 * †Latosporites
 * †Latosporites minutus
 * Latzelia.jpg †[[Latzelia]] – type locality for genus
 * †Latzelia primordialis – type locality for species
 * †Laudonocrinus
 * †Laudonocrinus subsinuatus
 * †Leangella
 * †Lecanocrinus
 * †Lecthaylus - type locality for genus
 * †Lecthaylus gregarius - type locality for species
 * †Leiotriletes
 * †Leiotriletes adnatoides
 * †Leiotriletes atshanensis – or unidentified comparable form
 * †Leiotriletes gracilis
 * †Leiotriletes levis
 * †Leiotriletes notatus
 * †Leiotriletes parvus
 * †Leiotriletes pseudolevis
 * †Lepadocystis
 * †Lepetopsis
 * †Lepetopsis chesterensis
 * †Lepidocarpon
 * †Lepidocyclus
 * Stigmaria Heimans.jpg †[[Lepidodendron]]
 * †Lepidodendron aculeatum
 * †Lepidodendron oblongifolium
 * †Lepidodendron veltheimii – or unidentified comparable form
 * †Lepidodendron volkmannianum
 * †Lepidodendron wortheni
 * †Lepidophloios
 * †Lepidophylloides
 * †Lepidophyllum
 * †Lepidophyllum campbelleanum
 * †Lepidostrobophyllum
 * †Lepidostrobus
 * †Leptaena
 * †Leptaena aequalis
 * †Leptaena rhomboidalis
 * †Leptagonia
 * †Leptagonia missouriensis – or unidentified comparable form
 * †Leptodesma
 * †Leptodesma ehlersi – or unidentified comparable form
 * †Leptodesma laevis
 * †Leptoptygma
 * †Leptoptygma fountainensis – type locality for species
 * †Leptoptygma golconda
 * †Lesleya
 * †Lesleya cheimarosa – type locality for species
 * †Lichas
 * †Lichas pugnax
 * Lingula anatina 7 .JPG †[[Lingula (genus)|Lingula]]
 * †Lingula carbonaria
 * †Lingula lamellata
 * †Linoproductus
 * †Linoproductus prattenianus
 * †Linopteris
 * †Linopteris rubella
 * †Liospira – tentative report
 * †Liroceras
 * †Liroceras liratum
 * †Lissatrypa – tentative report
 * †Lissochonetes
 * †Lissochonetes geinitzianus
 * †Lissomartus
 * †Lissomartus schucherti – type locality for species
 * †Listroncanthus
 * †Lithoneura – type locality for genus
 * †Lithoneura clayesi – type locality for species
 * †Lithoneura lameerei – type locality for species
 * †Lithoneura mirifica – type locality for species
 * †Lithoneura piecko – type locality for species
 * Zelithophaga truncata.jpg [[Lithophaga]] – tentative report
 * †Lithophaga subelliptica
 * †Litostrobus – or unidentified comparable form
 * †Litostrobus iowensis
 * †Lobeatta – type locality for genus
 * †Lobeatta schneideri – type locality for species
 * †Lophophyllidium
 * †Lophophyllidium proliferum
 * †Lophospira
 * †Lophospira obliqua
 * †Lophospira perangulata
 * †Lophospira serrulata
 * †Lophotriletes
 * †Lophotriletes comissuralis
 * †Lophotriletes commissuralis
 * †Lophotriletes copiosus
 * †Lophotriletes gibbosus
 * †Lophotriletes granoornatus – or unidentified comparable form
 * †Lophotriletes ibrahimi
 * †Lophotriletes microsaetosus
 * †Lophotriletes mosaicus
 * †Lophotriletes pseudaculeatus
 * †Lophotriletes rarispinosus
 * †Lycodemas – type locality for genus
 * †Lycodemas adolescens – type locality for species
 * †Lycospora
 * †Lycospora brevijuga
 * †Lycospora granulata
 * †Lycospora micropapillata
 * †Lycospora noctuina
 * †Lycospora orbicula
 * †Lycospora paulula
 * †Lycospora pellucida
 * †Lycospora punctata
 * †Lycospora pusilla
 * †Lycospora rotunda
 * †Lycospora subjuga
 * †Lycospora torquifer
 * †Lyellia
 * †Lyellia thebesensis
 * †Lygdozoon
 * †Lygdozoon arkansana
 * †Lyriocrinus
 * †Lyriocrinus melissa
 * Lysorophus.jpg †[[Lysorophus]] – type locality for genus
 * †Lysorophus tricarinatus – type locality for species

M

 * †Macrocrinus
 * †Macrocrinus mundulus
 * †Macrostylocrinus
 * †Macrostylocrinus striatus
 * †Macrostylocrinus subglobosus
 * †Maculatasporites
 * †Maculatasporites punctatus
 * †Mammia – type locality for genus
 * †Mammia alutacea – type locality for species
 * †Mariopteris
 * †Mariopteris occidentalis
 * †Mariopteris pygmaea
 * †Mariopteris sillimanni
 * †Mariopteris speciosa
 * †Marsupiocrinus
 * †Marsupiocrinus chicagoensis
 * †Mazoglossus
 * †Mazoglossus ramsdelli – type locality for species
 * †Mazonia – type locality for genus
 * †Mazonia woodiana – type locality for species
 * †Mazonopterum – type locality for genus
 * †Mazonopterum wolfforum – type locality for species
 * †Mazostachys
 * †Mazostachys pendulata
 * †Mazothairos – type locality for genus
 * †Mazothairos enormis – type locality for species
 * †Mcluckiepteron – type locality for genus
 * †Mcluckiepteron luciae – type locality for species
 * †Meekopora
 * †Meekopora eximia
 * †Meekospira
 * †Meekospira bambooformis
 * †Meekospira batteni
 * †Meekospira evansvillensis
 * †Meekospira minuta – type locality for species
 * †Megalometer – type locality for genus
 * †Megalometer lata – type locality for species
 * †Megastrophia
 * †Megastrophia profunda
 * †Megathentomum – type locality for genus
 * †Megathentomum pustulatum – type locality for species
 * †Megathentomum scudderi – type locality for species
 * †Megistocrinus
 * †Melinophlebia – type locality for genus
 * †Melinophlebia analis – type locality for species
 * †Melocrinites
 * †Melocrinites obpyramidalis
 * †Merista
 * †Meristina
 * †Mesoblastus – tentative report
 * †Mesolobus
 * †Mesoplica
 * †Mesoplica mesicostalis – tentative report
 * †Metacheliphlebia
 * †Metacheliphlebia elongata – type locality for species
 * †Metachorus
 * †Metachorus testudo – type locality for species
 * Metacoceras discoideum 01.jpg †[[Metacoceras]]
 * †Metacoceras copei – type locality for species
 * †Metaconularia
 * †Metaconularia manni
 * †Metatarbus – type locality for genus
 * †Metatarbus triangularis – type locality for species
 * †Metopolichas
 * †Metopolichas breviceps
 * †Miamia – type locality for genus
 * †Miamia bronsoni – type locality for species
 * †Microcaracrinus
 * †Microcaracrinus conjugulus – type locality for species
 * †Microreticulatisporites
 * †Microreticulatisporites concavus
 * †Microreticulatisporites harrisonii
 * †Microreticulatisporites lunatus
 * †Microreticulatisporites nobilis
 * †Microreticulatisporites sulcatus
 * †Milosaurus – type locality for genus
 * †Milosaurus mccordi – type locality for species
 * †Miobatrachus – type locality for genus
 * †Miobatrachus romeri – type locality for species
 * †Mischoptera
 * †Mischoptera douglassi – type locality for species
 * †Modiolopsis
 * †Modiomorpha
 * †Modiomorpha concentrica
 * †Modiomorphella
 * Spirograptus spiralis cropped.jpg †[[Monograptus]]
 * †Monograptus dubius
 * †Monograptus vomerinus
 * †Monomuchites
 * †Monomuchites annularis
 * †Monopteria
 * †Monopteria longa
 * †Mooreisporites
 * †Mooreisporites inusitatus
 * †Mooreoceras
 * †Moundocrinus
 * †Moundocrinus osagensis – or unidentified comparable form
 * †Mourlonia
 * †Mulceodens
 * †Mulceodens sibleyense – or unidentified related form
 * †Murchisonia
 * †Murchisonia akidota
 * †Murchisonia anderdoniae
 * †Murchisonia sibleyensis
 * †Murospora
 * †Murospora kosankei
 * †Myelodactylus
 * †Mylacris – type locality for genus
 * †Mylacris ampla – type locality for species
 * †Mylacris anthracophila – type locality for species
 * †Mylacris antiqua – type locality for species
 * †Mylacris diplodiscus – type locality for species
 * †Mylacris sellardsi
 * †Mylacris similis – type locality for species
 * †Myriotheca
 * †Myriotheca arnoldi – type locality for species
 * †Myriotheca scaberrima
 * †Mysticocrinus – report made of unidentified related form or using admittedly obsolete nomenclature
 * †Myxinikela – type locality for genus
 * †Myxinikela siroka – type locality for species

N

 * †Nacekomia – type locality for genus
 * †Nacekomia rossae – type locality for species
 * †Narkema – type locality for genus
 * †Narkema taeniatum – type locality for species
 * †Naticonema
 * Neritopsidae - Naticopsis.JPG †[[Naticopsis]]
 * †Naticopsis carleyana
 * †Naticopsis planifrons
 * †Naticopsis waterlooensis – type locality for species
 * †Nectoptilus – type locality for genus
 * †Nectoptilus mazonus – type locality for species
 * †Neilsonia
 * †Neilsonia welleri
 * †Nemastomoides – type locality for genus
 * †Nemastomoides longipes – type locality for species
 * †Nemavermes – type locality for genus
 * †Nemavermes mackeei – type locality for species
 * †Neochonetes
 * †Neochonetes granulifer
 * †Neofouquea – type locality for genus
 * †Neofouquea suzanneae – type locality for species
 * †Neospirifer
 * †Neospirifer dunbari
 * †Neospirifer triplicatus
 * Neuropteris cropped.jpg †[[Neuropteris]]
 * †Neuropteris clarksoni
 * †Neuropteris dussarti
 * †Neuropteris ovata
 * †Neuropteris parvifolia
 * †Neuropteris rarinervis
 * †Neuropteris scheuchzeri
 * †Neuropteris schlehani
 * †Neuropteris tennesseeana
 * †Neuropteris tenuifolia
 * †Nigeroplica
 * †Nigeroplica illinoisensis – tentative report
 * †Nodonema
 * †Nodonema granulatum
 * †Nucleospira
 * †Nucleospira minima
 * Nuculidae - Nucula piacentina.jpg [[Nucula]]
 * †Nuculoidea – tentative report
 * †Nuculopsis
 * †Nuculopsis girtyi
 * †Nummicrinus
 * †Nummicrinus waukoma

O

 * †Odontopteris
 * †Oligocarpia
 * †Oligotypus
 * †Oligotypus makowskii – type locality for species
 * †Onychopterella – tentative report
 * †Onychopterella pumilis
 * †Ootarbus – type locality for genus
 * †Ootarbus ovatus – type locality for species
 * †Ootarbus pulcher – type locality for species
 * †Opiliotarbus
 * †Opiliotarbus elongatus – type locality for species
 * †Orbiculoidea
 * †Orbiculoidea missouriensis
 * †Orbinaria
 * †Orbinaria brownensis – tentative report
 * †Orthomylacris
 * †Orthomylacris contorta – type locality for species
 * †Orthomylacris gurleyi – type locality for species
 * †Orthomylacris mansfieldi
 * †Orthomylacris rigida – type locality for species
 * †Orthonychia
 * †Orthonychia chesterense
 * †Orthospirifer
 * †Orthospirifer iowensis
 * †Orthotarbus
 * †Orthotarbus minutus – type locality for species
 * †Orthotarbus robustus – type locality for species
 * †Otarion
 * †Ovatia
 * †Ovatia nascens
 * †Ovopteris
 * †Ovopteris communis
 * †Oxynoblatta
 * †Oxynoblatta triangularis – type locality for species
 * †Oxyprora
 * †Oxyprora mesialis – type locality for species
 * †Oxyprora prattenanum – type locality for species

P

 * †Pachystrophia – tentative report
 * †Palaeobuthus – type locality for genus
 * †Palaeobuthus distinctus – type locality for species
 * †Palaeocarria – type locality for genus
 * †Palaeocarria ornata – type locality for species
 * †Palaeodictyopteron – report made of unidentified related form or using admittedly obsolete nomenclature
 * †Palaeodictyopteron latipenne – type locality for species
 * †Palaeodictyopteron mazonum – type locality for species
 * †Palaeolima
 * †Palaeolima equistriata
 * †Palaeolima retifer
 * †Palaeolima retifera
 * †Palaeoneilo
 * †Palaeoneilo taffiana
 * †Palaeopisthacanthus – type locality for genus
 * †Palaeopisthacanthus schucherti – type locality for species
 * †Palaeopteridium
 * †Palaeopteridium reussii
 * †Palaeostachys
 * †Palaeostachys andrewsii
 * †Palaeostylus
 * †Palaeozygopleura
 * †Palaeozygopleura venusta
 * †Palaeozygopleura welleri
 * †Palaeozygopleura wortheni – type locality for species
 * †Palaiotaptus – type locality for genus
 * †Palaiotaptus mazonus – type locality for species
 * †Palenarthrus – type locality for genus
 * †Palenarthrus impressus – type locality for species
 * †Paleospora
 * †Paleospora fragila
 * †Palmatopteris
 * †Parachaetetes
 * †Paraconularia
 * †Paraisobuthus
 * †Paraisobuthus virginiae – type locality for species
 * †Parajuresania
 * †Parajuresania nebrascensis
 * †Parallelodon
 * †Parallelodon obsoletus
 * †Parallelodon sangamonensis
 * †Parallelora
 * †Parallelora nupera
 * †Paralogopsis – type locality for genus
 * †Paralogopsis longipes – type locality for species
 * †Paramphicrinus – type locality for genus
 * †Paramphicrinus oklahomaensis – type locality for species
 * †Parapaolia
 * †Parapaolia superba – type locality for species
 * †Paraparchites
 * †Paraparchites carbonaria
 * †Paraparchites nicklesi
 * †Paraphorhynchus
 * †Paraphorhynchus striatocostatum
 * †Paratarbus – type locality for genus
 * †Paratarbus carbonarius – type locality for species
 * †Pareinoblatta
 * †Pareinoblatta sellardsi – type locality for species
 * †Paromylacris
 * †Paromylacris ampla – type locality for species
 * †Paromylacris rotunda – type locality for species
 * †Parulocrinus
 * †Parulocrinus pontiacensis – type locality for species
 * †Patellilabia
 * †Patellilabia chesterensis
 * †Paucicrura
 * †Paucijaculum – type locality for genus
 * †Paucijaculum samamithion – type locality for species
 * †Paupospira
 * †Paupospira thebesensis – type locality for species
 * Pecopteris villosa.jpg †[[Pecopteris]]
 * †Pecopteris plumosa
 * †Pecopteris serrulata
 * †Pecopteris vestita
 * †Pendulostachys – type locality for genus
 * †Pendulostachys cingulariformis – type locality for species
 * †Pentaramicrinus
 * †Pentaramicrinus bimagnaramus
 * †Pentremites
 * †Pentremites clavatus
 * †Pentremites godoni
 * †Pentremites obesus
 * †Pentremites okawensis
 * †Pentremites pyriformis
 * †Pentremites springeri
 * †Pentremites tulipaformis
 * †Pentremoblastus
 * †Pericalyphe – type locality for genus
 * †Pericalyphe longa – type locality for species
 * Periechecrinidae - Periechocrinus costatus.JPG †[[Periechocrinus]]
 * †Periechocrinus chicagoensis
 * †Periechocrinus infelix
 * †Periechocrinus marcouanus
 * †Periechocrinus necis
 * †Periechocrinus urniformis
 * †Pernopecten
 * †Pernopecten attenuatus – tentative report
 * †Pernopecten ohioensis
 * †Perotriletes
 * †Perotriletes parvigracilus
 * †Petrochus
 * †Petrochus conica
 * †Petrochus mellaria – or unidentified comparable form
 * Phacops rana crassituberculata lateral.jpg †[[Phacops]]
 * †Phacops norwoodensis
 * †Phanerotrema
 * †Pharkidonotus
 * †Pharkidonotus harrodi – type locality for species
 * †Pharkidonotus percarinatus
 * †Phascolophyllaphycus
 * †Phascolophyllaphycus lohrensis
 * †Phestia
 * †Phestia bellistriatus
 * Phlegethontia.jpg †[[Phlegethontia]]
 * †Phlegethontia longissima – type locality for species
 * †Phlyctiscapha
 * †Phragmoceras
 * †Phragmolites
 * †Phragmolites multinotatus – type locality for species
 * †Phyloblatta
 * †Phyloblatta diversipennis – type locality for species
 * †Phyloblatta hilliana – type locality for species
 * †Phymatopleura
 * †Pilosisporites
 * †Pilosisporites williamsii
 * †Pisocrinus
 * †Pityosporites
 * †Planisporites
 * †Planisporites granifer
 * †Platyceras
 * †Platyceras lineata
 * †Platyceras subrotundum
 * †Platycrinus
 * †Platylichas
 * †Platymylacris
 * †Platymylacris paucinervis – type locality for species
 * Platysomus gibbosus.jpg †[[Platysomus]]
 * †Platysomus circularis
 * †Platystrophia
 * †Platystrophia biforata
 * †Platyzona
 * †Plectatrypa
 * †Pleophrynus – type locality for genus
 * †Pleophrynus ensifer – type locality for species
 * †Pleurojulus
 * †Pleurojulus biornatus – or unidentified comparable form
 * †Plicochonetes
 * †Plicochonetes glenparkensis – tentative report
 * †Plummericrinus
 * †Plummericrinus erectus
 * †Pohlispongia – type locality for genus
 * †Pohlispongia monosphaera – type locality for species
 * †Pojetaconcha
 * †Pojetaconcha limatula
 * †Poliochera – type locality for genus
 * †Poliochera gibbsi – type locality for species
 * †Poliochera glabra – type locality for species
 * †Poliochera punctulata – type locality for species
 * †Polusocrinus
 * †Polusocrinus avanti
 * †Polyernus – type locality for genus
 * †Polyernus complanatus – type locality for species
 * †Polyetes – type locality for genus
 * †Polyetes furcifer – type locality for species
 * †Polygonocrinus
 * †Polygonocrinus spiniferus – type locality for species
 * Polysentor gorbairdi.jpg †[[Polysentor]] – type locality for genus
 * †Polysentor gorbairdi – type locality for species
 * †Porcellia
 * †Porcellia chesterensis
 * †Poteriocrinus – tentative report
 * †Potonieisporites
 * †Potonieisporites elegans
 * †Priapulites – type locality for genus
 * †Priapulites konecniorum – type locality for species
 * †Probletocrinus – type locality for genus
 * †Probletocrinus curtus – type locality for species
 * †Prochoroptera – type locality for genus
 * †Prochoroptera calopteryx – type locality for species
 * †Procoronaspora
 * †Procoronaspora dumosa
 * †Prodentalium
 * †Productella
 * †Productella subalata
 * Proetus concinnus reconstruction cropped.png †[[Proetus (trilobite)|Proetus]]
 * †Proetus canalis
 * †Proetus determinatus
 * †Proetus handwerki
 * †Progenentomum – type locality for genus
 * †Progenentomum carbonis – type locality for species
 * †Promexyele
 * †Promexyele peyeri
 * †Promylacris
 * †Promylacris ovalis – type locality for species
 * †Promytilus – tentative report
 * †Promytilus annosus
 * †Protatrypa
 * †Protoblattoidea – report made of unidentified related form or using admittedly obsolete nomenclature
 * †Protoblattoidea minor
 * †Protoblattoidea sellardsi
 * †Protodictyon – type locality for genus
 * †Protodictyon pulchripenne – type locality for species
 * †Protoleptostrophia
 * †Protomegastrophia
 * Titanophasma and Protophasma.jpg †[[Protophasma]]
 * †Protophasma galtieri – type locality for species
 * †Protopilio
 * †Protopilio depressus – type locality for species
 * †Protoscolex
 * †Protoscolex ruedemanni
 * †Protosolpuga – type locality for genus
 * †Protosolpuga carbonaria – type locality for species
 * †Pseudaviculopecten
 * †Pseudaviculopecten princeps
 * †Pseudoatrypa
 * †Pseudoatrypa devoniana
 * †Pseudogerarus – type locality for genus
 * †Pseudogerarus scudderi – type locality for species
 * †Pseudomonotis
 * †Pseudomonotis equistriata
 * Pseudophlegethontia turnbullorum.jpg †[[Pseudophlegethontia]] – type locality for genus
 * †Pseudophlegethontia turnbullorum – type locality for species
 * †Pseudorthoceras
 * †Pseudorthoceras knoxense
 * †Pseudosphonophyton
 * †Pseudosphonophyton höegii – type locality for species
 * †Pseudozygopleura
 * †Pseudozygopleura yandellana – or unidentified comparable form
 * †Pterinea
 * †Pterinea thebesensis
 * †Pterochiton
 * †Pterochiton carbonarius – type locality for species
 * †Pteronites
 * †Pterotheca
 * †Pterotheca triangularis – type locality for species
 * †Pterotocrinus
 * †Pterotocrinus abruptus
 * †Pterotocrinus armatus
 * †Pterotocrinus capitalis
 * †Pterotocrinus coronarius
 * †Pterotocrinus lingulaformis
 * †Pterotocrinus rugosus
 * †Ptychocarpus
 * †Pulchratia – tentative report
 * †Pulchratia symmetrica
 * †Punctatisporites
 * †Punctatisporites aerarius
 * †Punctatisporites curviradiatus
 * †Punctatisporites decorus
 * †Punctatisporites edgarensis
 * †Punctatisporites flavus
 * †Punctatisporites glaber
 * †Punctatisporites gracilirugosus – or unidentified comparable form
 * †Punctatisporites irrasus
 * †Punctatisporites kankakeensis
 * †Punctatisporites minutus
 * †Punctatisporites nahannensis
 * †Punctatisporites obesus
 * †Punctatisporites obliquus
 * †Punctatisporites orbicularis
 * †Punctatisporites pseudolevatus – or unidentified comparable form
 * †Punctatisporites vermiculatus
 * †Punctatosporites
 * †Punctatosporites minutus
 * †Punctospirifer
 * †Punctospirifer kentuckensis
 * †Punctospirifer transversus
 * †Pustulatisporites
 * †Pustulatisporites crenatus
 * †Pustulatisporties
 * †Pustulatisporties crenatus
 * †Pycnosaccus
 * †Pyrgocystis

Q

 * †Quadrochonetes
 * †Quadrochonetes geronticus
 * †Quasillinites
 * †Quasillinites diversiformis

R

 * †Radiizonates
 * †Radiizonates striatus
 * †Rafinesquina
 * †Rafinesquina mesicosta
 * †Raistrickia
 * †Raistrickia abdita
 * †Raistrickia aculeata
 * †Raistrickia aculeolata
 * †Raistrickia breveminens
 * †Raistrickia brevemines
 * †Raistrickia carbondalensis
 * †Raistrickia crinita
 * †Raistrickia crocea
 * †Raistrickia dispar
 * †Raistrickia fibrata – or unidentified comparable form
 * †Raistrickia grovensis
 * †Raistrickia irregularis
 * †Raistrickia lacerata
 * †Raistrickia lowellensis
 * †Raistrickia pilosa
 * †Raistrickia pontiacensis
 * †Raistrickia prisca
 * †Raistrickia solaria
 * †Raistrickia subcrinita
 * †Raistrickia superba
 * †Rasstriga – type locality for genus
 * †Rasstriga americana – type locality for species
 * †Redstockia
 * †Reinschospora
 * †Reinschospora magnifica
 * †Reinschospora triangularis
 * †Remopleurides
 * †Remopleurides missouriensis
 * †Renaultia
 * †Renisporites
 * †Renisporites confossus
 * †Resserella
 * †Reticulariiina
 * †Reticulariiina spinosa
 * †Reticulariina
 * †Reticulariina spinosa
 * †Reticulatia
 * †Reticulatia huecoensis
 * †Reticulatisporites
 * †Reticulatisporites lacunosus
 * †Reticulatisporites muricatus
 * †Reticulatisporites polygonalis
 * †Reticulatisporites reticulatus
 * †Reticulatisporites splendens
 * †Reticulograptus
 * †Reticulograptus polymorphus
 * †Retispira
 * †Retispira monronensis – type locality for species
 * †Retispira nodocostata – type locality for species
 * †Retispira ornatus – type locality for species
 * †Rhabdoxylon
 * †Rhabdoxylon americanum – type locality for species
 * †Rhineoderma
 * †Rhineoderma piasaensis – type locality for species
 * †Rhipidium
 * †Rhipidomella
 * †Rhipidomella carbonaria
 * †Rhipidomella rockportensis
 * †Rhodea
 * †Rhodea trichomanoides – or unidentified comparable form
 * †Rhodeopteridium
 * †Rhodeopteridium phillipsii – type locality for species
 * †Rhombopora
 * †Rhynchogonium
 * †Rhynchogonium fayettevillense
 * Rhynchonellidae - Rhynchonella species.JPG †[[Rhynchonella]]
 * †Rhynchopora
 * †Rhynchopora hamburgensis
 * †Rhynchopora prisca
 * †Rhynchopora pustulosa
 * †Rhynchotreta
 * †Rugosochonetes
 * †Rugosochonetes gregarius – or unidentified comparable form
 * †Rugosochonetes pikensis
 * †Ruthiphiala
 * †Ruthiphiala sublaevis

S

 * †Saccoglossus
 * †Saccoglossus testa – type locality for species
 * †Saetograptus
 * †Saetograptus colonus
 * †Sagenodus
 * †Sagenodus cristatus – type locality for species
 * †Sagittoceras
 * †Sagittoceras hathawayanum – type locality for species
 * †Salterospira
 * †Salterospira chesterensis
 * †Salterospira okawensis
 * †Salvadorea
 * †Salvadorea randi
 * †Samaropsis
 * †Savagella
 * †Savagella illinoisensis
 * †Savagella lindahli
 * †Savitrisporites
 * †Savitrisporites asperatus
 * †Savitrisporites majus
 * †Savitrisporites nux
 * †Scepasma – type locality for genus
 * †Scepasma gigas – type locality for species
 * †Sceptropora
 * †Sceptropora facula
 * †Schizodus
 * †Schizophoria
 * †Schizophoria hortonensis
 * †Schizophoria iowensis
 * †Schizotreta
 * †Schizotreta tenuilamellata
 * †Schondorfia – type locality for genus
 * †Schondorfia fungosa – type locality for species
 * †Schopfites
 * †Schopfites carbondalensis
 * †Schopfites colchesterensis
 * †Schopfites dimorphus
 * †Schuchertella
 * †Schuchertella hardinensis
 * †Schuchertella louisianaensis
 * †Schuchertella propinqua
 * †Schuchertiella – type locality for genus
 * †Schuchertiella gracilis – type locality for species
 * †Schulzospora
 * †Schulzospora rara
 * †Sciadiocrinus
 * †Sciadiocrinus tegillum – type locality for species
 * †Scolecopteris – tentative report
 * †Sedenticellula
 * †Sedenticellula hamburgensis
 * †Selenella
 * †Selenella pediculus
 * †Semiproductus
 * †Senftenbergia
 * †Sentosia
 * †Sentosia ignota – tentative report
 * †Septameroceras
 * †Serpulopsis
 * †Serpulospira
 * †Serpulospira diversiformis
 * †Shansiella
 * †Shansiella broadheadi – tentative report
 * †Shumardella
 * †Shumardella fracta
 * †Sievertsia
 * Stanhope Tree - geograph.org.uk - 2531669.jpg †[[Sigillaria]]
 * †Sigillaria mamillaris – or unidentified comparable form
 * †Sigillaria rugosa
 * †Sigillariostrobus
 * †Silphion – type locality for genus
 * †Silphion latipenne – type locality for species
 * †Similihariotta – type locality for genus
 * †Similihariotta dabasinskasi – type locality for species
 * † Simplicius
 * †Simplicius simplex – type locality for species
 * †Sinuspores
 * †Sinuspores sinuatus
 * †Siphonocrinus
 * †Siphonocrinus nobilis
 * †Skenidioides
 * Solemya elarraichensis holotype.jpg [[Solemya]]
 * †Solemya trapezoides
 * †Soleniscus
 * †Soleniscus primogenius
 * †Solenochilus
 * †Solenochilus shumwayense – type locality for species
 * †Sorellophrynus – type locality for genus
 * †Sorellophrynus carbonarius – type locality for species
 * †Spackmanites
 * †Spackmanites facierugosus – or unidentified comparable form
 * †Spackmanites habibii
 * †Sphaerexochus
 * †Sphaerexochus roemingeri
 * †Sphaerexochus romingeri
 * †Sphaerocoryphe
 * †Sphaerocoryphe arachniformis
 * Sphenophyllum miravallis.jpg †[[Sphenophyllum]]
 * †Sphenophyllum cuneifolium
 * †Sphenophyllum emarginatum
 * †Sphenophyllum longifolium – or unidentified comparable form
 * †Sphenopteris
 * †Sphenopteris distans
 * †Sphenopteris preslesensis
 * †Sphenosphaera
 * †Sphenosphaera consimilis – type locality for species
 * †Spilaptera
 * †Spilaptera americana – type locality for species
 * †Spilomastax – type locality for genus
 * †Spilomastax oligoneurus – type locality for species
 * †Spinatrypa
 * †Spinatrypa bellula
 * †Spinatrypa occidentalis
 * †Spinosporites
 * †Spinosporites exiguus
 * †Spinyplatyceras
 * †Spinyplatyceras fornicatum
 * †Spondylerpeton – type locality for genus
 * †Spondylerpeton spinatum – type locality for species
 * †Srokalarva – type locality for genus
 * Srokalarva berthei.jpg †[[Srokalarva berthei]] – type locality for species
 * †Staurocephalus
 * †Staurocephalus obsoleta
 * †Stearoceras
 * †Stearoceras involutum – type locality for species
 * †Stegerhynchus
 * †Stegerhynchus antiqua
 * †Stegerhynchus concinna
 * †Stegocoelia
 * †Stegocoelia okawensis
 * †Stellarocrinus
 * †Stellarocrinus bilineatus – type locality for species
 * †Stellarocrinus virgilensis – or unidentified comparable form
 * †Stellatheca
 * †Stellatheca latiloba
 * †Stellatheca ornata
 * †Stenopareia
 * †Stenopecrinus
 * †Stenopecrinus planus – or unidentified comparable form
 * †Stenoscisma
 * †Stenoscisma explanatum
 * †Stephanopsis – type locality for genus
 * †Stephanopsis mirandus – type locality for species
 * †Stephanozyga
 * Steth pair1 cropped.jpg †[[Stethacanthus]]
 * †Stethacanthus altonensis
 * †Stictopora
 * †Stigmaria
 * †Stigmaria ficoides
 * †Stigmaria stellata
 * †Stigmaria wedingtonensis
 * †Straparollus
 * †Straparollus subquadratus
 * †Streblochondria
 * †Striispirifer
 * †Strobeus
 * †Strobeus brevis
 * †Strobeus paludinaeformis
 * †Strophomena
 * †Strophostylus
 * †Strophostylus wortheni – type locality for species
 * †Styptobasis
 * †Styptobasis aculeata – type locality for species
 * †Subglobosochonetes
 * †Subglobosochonetes jerseyensis
 * Symmorium reniforme.JPG †[[Symmorium]] – type locality for genus
 * †Symmorium reniforme – type locality for species
 * †Syntonoptera – type locality for genus
 * †Syntonoptera schucherti – type locality for species
 * †Sypharoptera – type locality for genus
 * †Sypharoptera pneuma – type locality for species
 * †Syringopora
 * †Syringothyris
 * †Syringothyris extenuata
 * †Syringothyris hannibalensis

T

 * †Tainoceras
 * †Tainoceras monilifer
 * †Tainoceras sexlineatum – type locality for species
 * †Telangiopsis
 * †Telangium
 * †Telmatoscorpio – type locality for genus
 * †Telmatoscorpio brevipectus – type locality for species
 * Tentaculitid041011.jpg †[[Tentaculites]]
 * †Tentaculites bellulus
 * †Terpnocrinus – type locality for genus
 * †Terpnocrinus ocoyaensis – type locality for species
 * †Testajapyx – type locality for genus
 * †Testajapyx thomasi – type locality for species
 * †Thalamocrinus
 * †Thaleops
 * †Thaleops depressicapitata
 * †Thallites
 * †Thallites dichopleurus
 * †Thebanaspis
 * †Thebanaspis channahonensis
 * †Thebesia
 * †Thebesia thebesensis
 * †Thelyphrynus – type locality for genus
 * †Thelyphrynus elongatus – type locality for species
 * †Thesoneura – type locality for genus
 * †Thesoneura americana – type locality for species
 * †Thigriffides
 * †Thigriffides roundyi
 * †Tholocrinus
 * †Tholocrinus discus – type locality for species
 * †Tholocrinus unionensis – type locality for species
 * †Thuroholia
 * †Thuroholia cribriformis – type locality for species
 * †Thuroholia croneisi – type locality for species
 * †Thyloblatta
 * †Thymospora
 * †Thymospora pseudothiessenii
 * †Titanoscorpio – type locality for genus
 * †Titanoscorpio douglassi – type locality for species
 * †Torispora
 * †Torispora securis
 * †Torynifer
 * †Torynifer setiger
 * †Tranodis
 * †Tranodis castrensis
 * †Tremanotus
 * †Trepospira
 * †Trepospira depressa
 * †Triamara
 * †Triamara tumida
 * †Triamara ventricosa
 * †Trigera – tentative report
 * †Trigonocarpus
 * †Trigonoglossa – tentative report
 * †Trigonoglossa nebrascensis
 * †Trigonotarbus
 * †Trigonotarbus carbonarius – type locality for species
 * †Trihyphaecites
 * †Trihyphaecites triangulatus
 * †Triquitrites
 * †Triquitrites additus
 * †Triquitrites arculatus – or unidentified comparable form
 * †Triquitrites bransonii
 * †Triquitrites crassus
 * †Triquitrites desperatus
 * †Triquitrites dividuus
 * †Triquitrites exiguus
 * †Triquitrites minutus
 * †Triquitrites protensus
 * †Triquitrites pulvinatus
 * †Triquitrites sculptilis
 * †Triquitrites spinosus
 * †Triquitrites subspinosus
 * †Triquitrites trigonappendix
 * †Triquitrites truncatus
 * †Triticites
 * †Triticites pauper
 * †Triticites turgidus
 * †Trochonema
 * †Trochonema umbilicata – or unidentified comparable form
 * †Trochurus
 * †Trochurus welleri
 * †Tropidodiscus
 * †Tropidodiscus compticarinatus
 * †Tuberculatosporites
 * †Tuberculatosporites robustus
 * Tullimonstrum NT small cropped.jpg †[[Tullimonstrum]] – type locality for genus
 * †Tullimonstrum gregarius – type locality for species
 * †Turnbullia – type locality for genus
 * †Turnbullia priscillae – type locality for species
 * †Tylothyris
 * †Tylothyris missouriensis

U

 * †Ulocrinus
 * †Ulocrinus convexus
 * †Ulocrinus sangamonensis
 * †Undulabucania
 * †Undulabucania punctifrons
 * †Unispirifer
 * †Unispirifer senex

V

 * †Vallatisporites
 * †Valmeyeraphycus
 * †Valmeyeraphycus jerseyensis
 * †Valmeyerodendron
 * †Valmeyerodendron triangularifolium
 * †Verrucosisporites
 * †Verrucosisporites compactus
 * †Verrucosisporites donarii
 * †Verrucosisporites firmus
 * †Verrucosisporites microtuberosus
 * †Verrucosisporites papulosus
 * †Verrucosisporites sifati
 * †Verrucosisporites verrucosus
 * †Verrucosisporites verus – or unidentified comparable form
 * †Vesicaspora
 * †Vesicaspora wilsonii
 * †Vestispora
 * †Vestispora colchesterensis
 * †Vestispora costata
 * †Vestispora fenestrata
 * †Vestispora foveata
 * †Vestispora irregularis
 * †Vestispora laevigata
 * †Vestispora profunda
 * †Vestispora pseudoreticulata
 * †Vestispora wanlessii
 * †Volsellina
 * †Volsellina subelliptica

W

 * †Waeringoscorpio – type locality for genus
 * †Waeringoscorpio alliedensis – type locality for species
 * †Wellerella
 * †Wellerella osagensis
 * †Wellerella tetrahedra
 * †Welleriella – tentative report
 * †Whidbornella
 * †Whidbornella curtirostris
 * †Whitella
 * †Whitella sterlingensis
 * †Whitfieldella
 * †Whitfieldella billingsana
 * †Whittleseya
 * †Wilkingia
 * †Wilkingia costatum
 * †Wilsonites
 * †Wilsonites circularis
 * †Wilsonites delicatus
 * †Wilsonites vesicatus
 * †Worthenia
 * †Worthenia tabulata

X

 * Xylobius.jpg †[[Xyloiulus]]
 * †Xyloiulus frustulentus – type locality for species
 * †Xyloiulus mazonus – type locality for species

Y

 * †Yochelsonospira – type locality for genus
 * †Yochelsonospira tenuilineata – type locality for species
 * Yoldia

Z

 * †Zangerlispongia – type locality for genus
 * †Zangerlispongia richardsoni – type locality for species
 * †Zaphrenthis
 * †Zaphrenthis stokesi
 * †Zeilleria
 * †Zeugopleura
 * †Zeugopleura jeffersonensis
 * †Zophocrinus – tentative report
 * †Zosterogrammus – type locality for genus
 * †Zosterogrammus stichostethus – type locality for species