# List of the Paleozoic life of Nevada

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

## A

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Aatocrinus
** †Aatocrinus permicus
* †Acaciapora
** †Acaciapora duncanae – type locality for species
* †Acanthocladia
* †Acanthopecten
** †Acanthopecten coloradoensis
* Fossil of the Silurian-Middle Devonian trilobite Acanthopyge †Acanthopyge
* †Achlysopsis
** †Achlysopsis hemitora
** †Achlysopsis liokata
* †Aciculolenus
** †Aciculolenus peculiaris
* †Acidiphorus
** †Acidiphorus brevis – or unidentified comparable form
** †Acidiphorus lineotuberculatus
** †Acidiphorus pseudobathurus
* †Aclisina
* †Acmarhachis
** †Acmarhachis acuta
** †Acmarhachis acutus
** †Acmarhachis typicalis
* †Acodus
** †Acodus auritus – or unidentified comparable form
* †Acontiodus
** †Acontiodus alveolaris
* †Acosarina
** †Acosarina mesoplatys
* †Acratia
** †Acratia gassanovae – or unidentified related form
** †Acratia silincula – or unidentified related form
** †Acratia subelongata
* †Acrocyathus
* †Acrospirifer
** †Acrospirifer murchisoni – or unidentified related form
* †Acrothyra
* †Actinostroma
* †Acutichiton
** †Acutichiton gracilis – type locality for species
** †Acutichiton nevadensis – type locality for species
* †Adamsoceras
** †Adamsoceras isabelae
* †Adelograptus
** †Adelograptus antiquus
* †Aechmina – tentative report
* †Aesopomum
** †Aesopomum varistriatus – or unidentified comparable form
* †Agathammina
* †Agnostocrinus
** †Agnostocrinus typus
* †Agnostotes
** †Agnostotes clavata – or unidentified comparable form
* †Agnostus
* Fossilized shell of the Middle Devonian ammonoid cephalopod, Agoniatites †Agoniatites
* †Alaskospira
* †Albertella
** †Albertella aspinosa
** †Albertella eiloitys
** †Albertella fritizi – type locality for species
** †Albertella fritzi – type locality for species
** †Albertella highlandensis – type locality for species
** †Albertella judithi
** †Albertella lata – type locality for species
** †Albertella schenki – type locality for species
** †Albertella spectrensis
* †Albertellina
** †Albertellina aspinosa
* †Albertelloides – type locality for genus
** †Albertelloides kitae – type locality for species
** †Albertelloides kitai – type locality for species
** †Albertelloides mischi – type locality for species
** †Albertelloides pandispinata – type locality for species
** †Albertelloides rectimaginatus
** †Albertelloides rectimarginatus
* †Allorhynchus
** †Allorhynchus heteropsis
* †Allorisma – report made of unidentified related form or using admittedly obsolete nomenclature
* †Allosocrinus – tentative report
* †Alokistocare
** †Alokistocare alta – type locality for species
* †Alokistocarella
** †Alokistocarella brighamensis – or unidentified comparable form
* †Altiocculus
** †Altiocculus drumensis
* †Alveolites
* †Amaurotoma
** †Amaurotoma zappa – type locality for species
* †Ambocoelia
** †Ambocoelia lobata – tentative report
** †Ambocoelia recidiva
* †Ambothyris
* †Amecephalites – type locality for genus
** †Amecephalites sundbergi – type locality for species
* †Amecephalus
** †Amecephalus arrojosensis
** †Amecephalus laticaudum
* †Amorphognathus
** †Amorphognathus ordovicicus
* †Amphilichas
** †Amphilichas minganensis – or unidentified related form
* †Amphipora
* †Amphiscapha
** †Amphiscapha intermedius – type locality for species
** †Amphiscapha proxima
* †Amplexizaphrentis
* †Amplexoides
** †Amplexoides radicosi – tentative report
* †Amplifallotaspis
** †Amplifallotaspis keni
* †Ampyx – tentative report
* †Ampyx
* †Ampyxina
* †Ampyxoides
** †Ampyxoides occipitalis – or unidentified comparable form
* †Anabarella
** †Anabarella chelata – type locality for species
* †Anabolotreta
** †Anabolotreta glabra – type locality for species
** †Anabolotreta mogota – type locality for species
* † Ananias
** †Ananias nevadensis
** †Ananias seminudum – type locality for species
* †Anaphilicas – tentative report
* †Anastrophia
** †Anastrophia magnifica – or unidentified comparable form
* †Anataphrus
** †Anataphrus martinensis
** †Anataphrus spurius – or unidentified comparable form
* †Ancillotoechia
** †Ancillotoechia aptata
** †Ancillotoechia pahranagatensis
* †Anechocephalus
** †Anechocephalus spinosus
** †Anechocephalus trigranulatus
* †Anemonaria
** †Anemonaria delicatula
* Angulocellularia
* †Angulotreta
* †Anisocyamus
* †Anisopyge
* †Anisotrypa
* †Anisotrypella
* †Anolotichia
* Restorative model of the Cambrian arthropod Anomalocaris †Anomalocaris
* †Anomalorthis
** †Anomalorthis fascicostatus – or unidentified comparable form
** †Anomalorthis fascicostellatus
** †Anomalorthis lonensis
** †Anomalorthis nevadensis
** †Anomalorthis oklahomensis
** †Anomalorthis resoi
** †Anomalorthis utahensis
* †Anomphalus
** †Anomphalus jaggerius – type locality for species
* †Anoplia
** †Anoplia elongata
* †Anostylostroma
* †Antagmus
** †Antagmus arenosus – type locality for species
* †Anthaspidella
** †Anthaspidella clintoni
* †Anthraconeilo – tentative report
* †Anthracospirifer
** †Anthracospirifer bifurcatus – or unidentified comparable form
** †Anthracospirifer birdspringensis
** †Anthracospirifer curvilateralis
** †Anthracospirifer newberryi
** †Anthracospirifer occiduus
** †Anthracospirifer opimus
** †Anthracospirifer pellaensis – or unidentified related form
* †Anticostia
** †Anticostia fastigata
** †Anticostia fastigiata
** †Anticostia festigata
** †Anticostia lata
** †Anticostia macgregorae
** †Anticostia tenuissima
** †Anticostia thorsteinssoni
** †Anticostia uniformis
* †Antiquatonia
** †Antiquatonia coloradoensis
** †Antiquatonia elyensis
** †Antiquatonia hermosana
** †Antiquatonia morrowensis
** †Antiquatonia portlockianus
* †Antirhynchonella
* †Antistrix
** †Antistrix invicta
* †Apachella
* †Apachia
** †Apachia butlerensis
* †Aparchites
* †Apatokephalus
** †Apatokephalus finalis – tentative report
* †Apatolichas
** †Apatolichas jukesi – or unidentified comparable form
* †Aphelaspis
** †Aphelaspis brachyphasis – type locality for species
** †Aphelaspis buttsi
** †Aphelaspis haguei
** †Aphelaspis subditus
* †Aphelotoxon
** †Aphelotoxon acuminata
** †Aphelotoxon marginata
** †Aphelotoxon punctata
* †Apheoorthis
* †Aphroidophyllum
** †Aphroidophyllum inceptor – type locality for species
* †Aploconus
** †Aploconus lafustei – type locality for species
* †Aporthophyla
** †Aporthophyla typa
** †Aporthophyla typica
* †Appendispinograptus
** †Appendispinograptus leptothecalis
** †Appendispinograptus longispinus
** †Appendispinograptus supernus
* †Arceodomus
** †Arceodomus glabrata
** †Arceodomus langenheimi
* †Archaediscus
** †Archaediscus krestovnikovi
** †Archaediscus moelleri – or unidentified loosely related form
* Fossilized shell and spines of the Late Devonian-Permian sea urchin Archaeocidaris †Archaeocidaris
* †Archaeocothurnus
** †Archaeocothurnus goshutensis – type locality for species
* †Archaeocyathus
** †Archaeocyathus atlanticus – or unidentified comparable form
* †Archaeophiomusium
** †Archaeophiomusium bispinosum – type locality for species
** †Archaeophiomusium burrisi
* †Archaeorthis
** †Archaeorthis costellatus
** †Archaeorthis elongata
** †Archaeorthis elongatus
* †Archaeoscyphia
** †Archaeoscyphia bassleri – type locality for species
** †Archaeoscyphia eganensis – type locality for species
** †Archaeoscyphia pannosa – type locality for species
** †Archaeoscyphia pulchra
** †Archaeoscyphia rossi – type locality for species
* †Archaeosycon
** †Archaeosycon copulatus
* †Archinacella – tentative report
* †Arcochiton
** †Arcochiton richardsoni – type locality for species
* †Areostrophia
** †Areostrophia rara
* †Arroyocrinus
** †Arroyocrinus brachiatus
** †Arroyocrinus popenoei
* †Arrythmocricus
** †Arrythmocricus mcdamensis
* †Asaphellus
** †Asaphellus eudocia – or unidentified comparable form
** †Asaphellus riojanus
* †Asarcophyllum
** †Asarcophyllum ramosum
* †Ascopora
* †Asgardaspira
** †Asgardaspira measuresae
** †Asgardaspira yochelsoni
* †Asphaltina
* †Aspidagnostus
** †Aspidagnostus laevis – type locality for species
** †Aspidagnostus rugosus
* †Astartella
** †Astartella subquadrata
* †Asthenophyllum
** †Asthenophyllum orthoseptatum – tentative report
* †Astreptodictya
* †Astroproetus
* †Asymphylotoechia
** †Asymphylotoechia nolani
* †Atelelasma
** †Atelelasma primotica
* †Athabaskia
* †Athyridacid
* †Athyris
** †Athyris angelica
** †Athyris angelicoidea
** †Athyris lamellosa
* †Atopocystis – type locality for genus
** †Atopocystis mucronata – type locality for species
* †Atrypa
** †Atrypa nevadana
** †Atrypa parva – or unidentified comparable form
** †Atrypa reticularis
* †Atrypina
** †Atrypina erugata
** †Atrypina rugata
** †Atrypina simpsoni – type locality for species
* †Atrypoidea
* †Aulacoparia
** †Aulacoparia venta – or unidentified comparable form
* †Aulocystis
* †Aulopora
* †Auloprotonia
* †Australispongia
** †Australispongia compressa – type locality for species
* †Australophyllum – tentative report
* Mold fossil of a shell of the Early Devonian-Late Triassic bivalve Aviculopecten †Aviculopecten
** †Aviculopecten affinis
** †Aviculopecten eurekensis
** †Aviculopecten haguei
** †Aviculopecten pintoensis
* †Aviculopinna
** †Aviculopinna consimilis – or unidentified comparable form
** †Aviculopinna peracuta – tentative report
* †Avonia
* †Axofistulophyllum
** †Axofistulophyllum conulus – tentative report
** †Axofistulophyllum convexum

## B

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Bactroceras
** †Bactroceras angustisiphonatum
* Bairdia
** †Bairdia confragosaeformis – or unidentified comparable form
** †Bairdia fabaeformis – or unidentified comparable form
** †Bairdia manifesta
* †Bairdiacypris
** †Bairdiacypris anteroangulosa
** †Bairdiacypris martinae
** †Bairdiacypris quarziana
* †Bairdiocypris
* †Bakevellia
* †Ballardina
** †Ballardina simplex
* †Baltoceras
** †Baltoceras striatum – type locality for species
* †Basilicus
** †Basilicus mackeei
** †Basilicus mckeei
* †Batenevia
* †Bathymyonia
** †Bathymyonia nevadensis – type locality for species
** †Bathymyonia type locality for species A – informal
* Illustration of a fossil of the Cambrian trilobite Bathynotus †Bathynotus
** †Bathynotus holopygus
* †Bathyocos
** †Bathyocos housensis
* †Bathyurellus
** †Bathyurellus feitleri
* †Bathyuriscus
** †Bathyuriscus petalus
* †Bathyurus
** †Bathyurus acutus
** †Bathyurus extans – or unidentified comparable form
** †Bathyurus nevadensis
** †Bathyurus sunbloodensis
* †Batostomellina
* †Beecheria
* †Bekena
* †Bellazona
** †Bellazona bella
* †Bellefontia
* Fossilized shell of the Silurian-Early Triassic mollusc Bellerophon †Bellerophon
** †Bellerophon deflectus
** †Bellerophon needlensis – type locality for species
** †Bellerophon nevadensis
* †Belodella
* †Belodina
** †Belodina confluens
** †Belodina disponsa – or unidentified comparable form
** †Belodina monitorensis
** †Belodina ornata – or unidentified comparable form
* †Benthamaspis
** †Benthamaspis sera
* †Bergaueria – tentative report
* †Besselodus
** †Besselodus borealis
* †Beyrichia
* †Bicarina
** †Bicarina type locality for species A – informal
* Life restoration of the Cambrian trilobite Biceratops †Biceratops – type locality for genus
** †Biceratops nevadensis – type locality for species
* †Biciragnostus
** †Biciragnostus viator
* †Bienvillia
** †Bienvillia papulosa
* †Bifida – tentative report
* †Bighornia
* † Bija
* †Bilobia
* †Bimuria
* †Blastoidocrinus
** †Blastoidocrinus nevadensis
* †Blosyropsis
* †Blountia
** †Blountia bristolensis
* †Bohemograptus
** †Bohemograptus bohemicus
* †Bojothyris
* †Bolbocephalus – tentative report
* †Bolbolenellus
** †Bolbolenellus brevispinus – type locality for species
* †Bonnia
** †Bonnia caperata – type locality for species
** †Bonnia copia – type locality for species
* †Botomaella
* †Boucotspira
** †Boucotspira antelopensis
* †Boultonia
** †Boultonia heezeni – type locality for species
* †Brachyprion
** †Brachyprion geniculata
** †Brachyprion mirabilis
* †Brachyspirifer
** †Brachyspirifer pinyonoides – type locality for species
* †Bradyfallotaspis
* †Bradyphyllum
** †Bradyphyllum gracilium – type locality for species
* †Bransonia
* †Brasilioproductus
** †Brasilioproductus welleri – or unidentified comparable form
* †Brevibelus
** †Brevibelus breviformis
* †Breviphrentis
** †Breviphrentis invaginata
** †Breviphrentis invaginatus
** †Breviphrentis johnsoni
** †Breviphrentis kirki
** †Breviphrentis magna
* †Briantia
** †Briantia mulleri
* †Bristolia
** †Bristolia anteros
** †Bristolia bristolensis
** †Bristolia fragilis
* †Broeggeria – tentative report
* †Bromella
** †Bromella veritas
* †Brongniartella
* †Brunsia
* †Budnaniella
** †Budnaniella shenandoense – or unidentified comparable form
* Life restoration of the Early Ordovician-Silurian trilobite Bumastus †Bumastus
* †Buxtonia
** †Buxtonia websteri – type locality for species
* †Bynumina
** †Bynumina globosa
* †Bythicheilus
* Bythocypris

## C

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Caborcella
** †Caborcella clinolimbata – type locality for species
** †Caborcella ganosa
** †Caborcella granosa
** †Caborcella pseudaulax
** †Caborcella reducta
* †Cabrieroceras
** †Cabrieroceras crispiforme – or unidentified related form
* †Calathium
* †Calcispheara
* †Calcitornella
* †Calcivertella
* †Caliendrum – or unidentified related form
* †Calliprotonia
** †Calliprotonia spinula – type locality for species
* †Calstevenus – type locality for genus
** †Calstevenus arcturus – type locality for species
* †Calycalyptella
* †Calycocoelia
** †Calycocoelia murella – type locality for species
** †Calycocoelia typicalis
* †Calygirtyoceras
** †Calygirtyoceras arcticum
* †Calymene
* †Calyptaulax
** †Calyptaulax callirachis – or unidentified comparable form
* †Camarotoechia
** †Camarotoechia modica – or unidentified comparable form
** †Camarotoechia pahranagatensis
** †Camarotoechia vesper
* †Camerella
* Life restoration of the Cambrian arthropod Canadaspis (left) †Canadaspis
* †Canadiphyllum
* †Cancelloceras
** †Cancelloceras elegans – or unidentified comparable form
* †Cancrinella
* †Caninia
** †Caninia elkoensis – type locality for species
** †Caninia goldcreekensis – type locality for species
** †Caninia torquia
* †Caninostrotion
* †Canthylotreta
** †Canthylotreta crista – type locality for species
* †Cardiomorpha
* †Carinagypa
* †Carinamala
** †Carinamala longispina – type locality for species
* †Carlinastraea
** †Carlinastraea halysitoides
* †Carolinites
** †Carolinites ekphymosus – or unidentified comparable form
** †Carolinites genacinaca
** †Carolinites killaryensis – or unidentified comparable form
** †Carolinites sibiricus
* †Carrickia
* †Cassidirostrum
** †Cassidirostrum eurekaensis – or unidentified comparable form
** †Cassidirostrum vexans – type locality for species
* †Catazona – type locality for genus
** †Catazona rudilirata – type locality for species
* †Catazone
** †Catazone nevadana – type locality for species
* †Catenipora
* †Catoraphiceras
** †Catoraphiceras foerstei
* †Cavusgnathus
** †Cavusgnathus gigantus
** †Cavusgnathus lautus
** †Cavusgnathus spathus
* Fossil of the Cambrian trilobite Cedaria †Cedaria
** †Cedaria brevifrons – type locality for species
* †Celonocrinus
** †Celonocrinus expansus
* †Cenorhynchia
** †Cenorhynchia type locality for species A – informal
** †Cenorhynchia type locality for species B – informal
* †Centropleura
* †Ceratocephala – tentative report
* †Ceratoikiscum – tentative report
* †Ceratopea
** †Ceratopea latiumbilicata – or unidentified comparable form
** †Ceratopea lemonei
* †Ceraurinella
* †Ceraurinus
** †Ceraurinus icarus
* Fossil of the Middle-Late Ordovician trilobite Ceraurus †Ceraurus
* †Cernuolimbus
** †Cernuolimbus depressus
** †Cernuolimbus granulosus
** †Cernuolimbus laevifrons
** †Cernuolimbus orygmatos
** †Cernuolimbus semigranulosus
* †Chaetetes
** †Chaetetes milleporaceus
* †Chalaroschwagerina
** †Chalaroschwagerina ampla – type locality for species
** †Chalaroschwagerina eximia – type locality for species
** †Chalaroschwagerina formosa – type locality for species
** †Chalaroschwagerina globularis – type locality for species
** †Chalaroschwagerina inflata – type locality for species
** †Chalaroschwagerina solita – type locality for species
** †Chalaroschwagerina tumentis
* Chancelloria †Chancelloria
* †Chancia
** †Chancia maladensis – tentative report
** †Chancia venusta
** †Chancia venuxa – or unidentified comparable form
* †Chanciaopsis
** †Chanciaopsis heteromorphos
* †Charchaqia
** †Charchaqia norini
* †Chaulistomella – tentative report
* †Chazydictya
* †Cheilocephalus
** †Cheilocephalus brachyops
** †Cheilocephalus brevilobus
** †Cheilocephalus granulosus
* †Chonetes
** †Chonetes euampygus
** †Chonetes logani
* †Choperella
** †Choperella jeanette
* †Choristites
** †Choristites orbitus – type locality for species
* †Cibolocrinus
** †Cibolocrinus typus
* †Cladochonus
** †Cladochonus nevadensis – type locality for species
** †Cladochonus shawi – type locality for species
* Fossilized tooth of the shark Cladodus †Cladodus
* †Cladopora
* †Clathronema
** †Clathronema batteni – type locality for species
* †Clathrospira
* †Cleiothyrdina
** †Cleiothyrdina orbicularis
* †Cleiothyridina
** †Cleiothyridina angelicoides – or unidentified comparable form
** †Cleiothyridina ciriacksi
** †Cleiothyridina deroissyi
** †Cleiothyridina elegans
** †Cleiothyridina milleri
** †Cleiothyridina orbicularis
** †Cleiothyridina pecosii
** †Cleiothyridina pecossi – or unidentified comparable form
** †Cleiothyridina reticulata
** †Cleiothyridina type locality for species A – informal
** †Cleiothyridina type locality for species B – informal
* †Clelandia – tentative report
* †Climacammina
** †Climacammina patula – or unidentified loosely related form
** †Climacammina prisca – or unidentified loosely related form
* †Climacograptus
** †Climacograptus caudatus
** †Climacograptus hastatus
** †Climacograptus innotatus
** †Climacograptus phyllophorus – or unidentified comparable form
** †Climacograptus tridentatus
** †Climacograptus tubuliferus
* †Climaconus
* †Clinopistha
** †Clinopistha levis
* †Clisiophyllum
* †Clisospira
* Cloacaspis †Cloacaspis
** †Cloacaspis tesselata
* †Clonopora – tentative report
* †Cnemidactis
** †Cnemidactis macroadambulacralatas – type locality for species
* †Coelospira
** †Coelospira concava
** †Coelospira pseudocamilla – type locality for species
* †Colaptomena
* †Coledium
** †Coledium therum
* †Coleoloides
** †Coleoloides inyoensis – type locality for species
* †Colinispongia
** †Colinispongia regularis – type locality for species
* †Colpites
* †Columnaria
* †Comanchia
** †Comanchia minus
* Fossilized shell of the Late Devonian-Permian brachiopod Composita †Composita
** †Composita apheles – or unidentified comparable form
** †Composita gibbosa
** †Composita mexicana
** †Composita mira
** †Composita ovata
** †Composita parasulcata
** †Composita subquadrata
** †Composita subtilita
** †Composita trilobata
** †Composita trilobita
** †Composita trinuclea
* †Compsonema – type locality for genus
** †Compsonema fragile – type locality for species
* †Conchidium
* †Conchopeltus
* †Conocardium
* †Conotoma
** †Conotoma aurora
* †Conotreta
* Fossil of the Ordovician bryozoan Constellaria †Constellaria
* †Contignatiospongia – type locality for genus
** †Contignatiospongia nevadensis – type locality for species
* †Conularia
* †Cooleyella
** †Cooleyella duffini
* †Coosia
** †Coosia longocula – type locality for species
* †Cordillerastraea
** †Cordillerastraea complexa
** †Cordillerastraea nevadaensis – type locality for species
** †Cordillerastraea nevadensis
* †Cordylodus
** †Cordylodus angulatus
** †Cordylodus intermedius
** †Cordylodus lindstomi
** †Cordylodus proavus
* †Cornuodus
* Cornuspira
* †Cornwallatia – type locality for genus
** †Cornwallatia tabularia – type locality for species
* †Cortezorthis
** †Cortezorthis cortezensis – type locality for species
* †Corydylodus
* †Corynexochides
** †Corynexochides prolatus
* †Corynexochoides
** †Corynexochoides prolatus
* †Costatumulus
** †Costatumulus altissima
* †Costellarina
** †Costellarina kaasai
** †Costellarina plasi
* †Costipelagiella
** †Costipelagiella nevadense – type locality for species
* †Costispirifer
* †Cothurnocysts
** †Cothurnocysts saukia – type locality for species
* †Cranaena
* †Crassialveolites
** †Crassialveolites dubatalovi – or unidentified comparable form
* †Crassifimbra
** †Crassifimbra walcotti
* †Cravenoceras
** †Cravenoceras friscoense
* †Crenispirifer – tentative report
* †Crimites
** †Crimites elkoensis – type locality for species
* †Criteriognathus
** †Criteriognathus eurekaensis
* †Crurithyris
** †Crurithyris calendae
** †Crurithyris expansa
** †Crurithyris fissa – type locality for species
** †Crurithyris planoconvexa
** †Crurithyris wampensis
* †Cryptolithoides
** †Cryptolithoides fittsi
** †Cryptolithoides reticulatus
* †Cryptolithus
* †Cryptophyllus
* †Ctenalosia
** †Ctenalosia fixata
* †Ctenodonta
* †Culumbodina
** †Culumbodina occidentalis
* †Culumbodine
** †Culumbodine penna
* †Cuparius
** †Cuparius cardilatus
* †Curtoceras
* †Cyathaxonia
* †Cyathophycus
** †Cyathophycus pseudoreticulatus – type locality for species
** †Cyathophycus reticulatus – tentative report
* †Cyathophyllum
** †Cyathophyllum eurekaense
* †Cybeloides
* †Cybelopsis
* †Cybelurus
** †Cybelurus halo
* †Cymbidium
* †Cypricardella
** †Cypricardella connata
** †Cypricardella striata – or unidentified related form
* †Cypricardinia
** †Cypricardinia moorefieldana – or unidentified related form
* †Cyptendoceras
** †Cyptendoceras kirki – type locality for species
** †Cyptendoceras rhythmicum – type locality for species
* †Cyrtia
* †Cyrtina
** †Cyrtina caroline
** †Cyrtina neogenes
** †Cyrtina varia – or unidentified comparable form
* †Cyrtinaella
** †Cyrtinaella causa – type locality for species
* †Cyrtinoides
** †Cyrtinoides septata
* †Cyrtoniodus
** †Cyrtoniodus flexuosus
* †Cyrtonotella
** †Cyrtonotella fasciculata – or unidentified related form
* †Cyrtorostra
* Fossilized shells of the Middle-Late Devonian brachiopod Cyrtospirifer †Cyrtospirifer
** †Cyrtospirifer breviposticus
** †Cyrtospirifer portae – or unidentified comparable form
** †Cyrtospirifer whitneyi
* †Cyrtothoracoceras
* †Cystiphylloides
* †Cystodictya
* †Cytherellina
** †Cytherellina obusa

## D

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Dactyletes
* †Dactylogonia
** †Dactylogonia vespertina
* †Dactylotreta
** †Dactylotreta elegantula – type locality for species
* †Dalejina
* Fossil of the Late Ordovician-Middle Devonian trilobite Dalmanites †Dalmanites
* †Dapsilodus
** †Dapsilodus obliquicostatus
* †Daraelites
** †Daraelites leonardensis
* †Davidsonia
** †Davidsonia antelopensis
* †Deceptrix
* †Dechenella
* †Decoranewsomites
** †Decoranewsomites angelicus
* †Decoriconus
** †Decoriconus fragilis
* †Decorospira – type locality for genus
** †Decorospira rigbyi – type locality for species
* †Delamarella – type locality for genus
** †Delamarella breispinaspis
** †Delamarella brevispinaspis – type locality for species
* †Delaria
** †Delaria sevilloidia
** †Delaria snowi
* †Dellea – tentative report
** †Dellea punctata
* †Delmarella – type locality for genus
** †Delmarella brevispinaspis – type locality for species
* †Delocrinus
** †Delocrinus graphicus – or unidentified related form
** †Delocrinus vastus
* †Delthyris
* †Denayella
** †Denayella housei – type locality for species
* Dentalium
* †Derbyia
** †Derbyia crassa
** †Derbyia subcircularis
** †Derbyia sulca
** †Derbyia wabaunseensis
* †Desatrypa
** †Desatrypa copperi
* †Desmoinesia
** †Desmoinesia ingrata
** †Desmoinesia nana
* †Desmorthis
** †Desmorthis costata
** †Desmorthis crassus
** †Desmorthis nevadensis
** †Desmorthis planus
* †Devonalosia – tentative report
* †Devonoproductus
** †Devonoproductus hallanus
** †Devonoproductus minimus – or unidentified comparable form
* †Diacanthaspis – tentative report
* †Dianulites
* †Diaphragmaphyllum
** †Diaphragmaphyllum grossum – or unidentified related form
* †Diaphragmus
** †Diaphragmus phillipsi
* †Dicanthopyge
** †Dicanthopyge convergens
** †Dicanthopyge quadrata
** †Dicanthopyge reductus
* †Dicellograptus
** †Dicellograptus alector – type locality for species
** †Dicellograptus anceps
** †Dicellograptus complanatus
** †Dicellograptus divaricatus – or unidentified comparable form
** †Dicellograptus minor
** †Dicellograptus mirabilis
** †Dicellograptus ornatus
** †Dicellograptus sextans
** †Dicellograptus tumidus
** †Dicellograptus turgidus
* †Diceratograptus
** †Diceratograptus mirus
* †Diceromyonia
** †Diceromyonia ignota
* †Dichognathus
** †Dichognathus typica
* †Dichogranthus
* †Dicoelosia
** †Dicoelosia biloba
* †Dicranograptus
* †Dictyoclostus
* †Dictyonema
* †Dictytonina
** †Dictytonina pannula
* Fossil of the Middle Ordovician graptolite Didymograptus †Didymograptus
** †Didymograptus artus
** †Didymograptus protobifidus
* †Dielasma
** †Dielasma diabloense – or unidentified comparable form
** †Dielasma phosphoriense
* †Dimegelasma
** †Dimegelasma eurekensis – type locality for species
* †Dimeropyge – tentative report
* †Dimeropygiella
** †Dimeropygiella caudanodosa
** †Dimeropygiella ovata
* †Dimorphoceras
* †Dinorthis
** †Dinorthis occidentalis
* †Diparelasma
** †Diparelasma typicum – or unidentified comparable form
* †Diplocyathellus
* Cambrian graptolite Diplograptus †Diplograptus
** †Diplograptus rarithecatus
** †Diplograptus rigidus
* †Diplotrypa
* †Discomyorthis
** †Discomyorthis musculosa
* †Disphyllum
* †Distacodus
** †Distacodus symmetricus
* †Distomodus
* †Divaricospongia – type locality for genus
** †Divaricospongia dilata – type locality for species
* †Dokimocephalus
** †Dokimocephalus pernasutus
* †Dolerorthis
** †Dolerorthis flabellites
* †Donaldiella
** †Donaldiella cicelia
* †Donaldina
* †Donaldospira
** †Donaldospira geminocarinata – or unidentified comparable form
* †Dorlodotia
* †Dorytreta – tentative report
* †Drepanodus
** †Drepanodus subarcuatus
* †Drepanoistodus
** †Drepanoistodus deltife
** †Drepanoistodus suberectus
* †Droharhynchia
** †Droharhynchia intermissa
* †Dunbarella
* †Dunderbergia
** †Dunderbergia anyta
** †Dunderbergia bigranulosa
** †Dunderbergia brevispina
** †Dunderbergia calculosa
** †Dunderbergia nitida
** †Dunderbergia polybothra
** †Dunderbergia variagranula
* †Durhamina
** †Durhamina cordillerensis – type locality for species
** †Durhamina moormanensis – type locality for species
** †Durhamina primitiva – type locality for species
** †Durhamina richi
** †Durhamina snyderi – type locality for species
** †Durhamina sublaeve
* †Dvorakia
* †Dyoros
** †Dyoros nevadaensis – type locality for species
** †Dyoros type locality for species A – informal
* †Dyscritella
** †Dyscritella acanthostylia – type locality for species
* †Dyticospirifer – type locality for genus
** †Dyticospirifer mccolleyensis – type locality for species
* †Dytremacephalus
** †Dytremacephalus asperaxis
** †Dytremacephalus granulosus

## E

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Earlandia
** †Earlandia vulgaris
* †Ecculiomphalus
** †Ecculiomphalus harrisae
* †Eccyliopterus
* Echidnina
** †Echidnina bengstoni – type locality for species
* †Echinalosia
** †Echinalosia type locality for species A – informal
* †Echinaria
** †Echinaria knighti
** †Echinaria semipunctata – or unidentified comparable form
* †Echinauris
** †Echinauris magna
** †Echinauris subhorrida – type locality for species
* †Echinocoelia
** †Echinocoelia careocamera
** †Echinocoelia denayensis
** †Echinocoelia williamsi
* †Echinoconchus
** †Echinoconchus biseriatus – or unidentified related form
** †Echinoconchus elegans
** †Echinoconchus semipunctatus
** †Echinoconchus vittatus – or unidentified related form
* †Ecnomiophyllum – type locality for genus
** †Ecnomiophyllum fascis – type locality for species
** †Ecnomiophyllum merriami – type locality for species
** †Ecnomiophyllum simpsoni
* †Ectenonotus
** †Ectenonotus westoni – or unidentified comparable form
** †Ectenonotus whittingtoni
** †Ectenonotus whittingtonia
* †Ectenotus – tentative report
* †Ectoprimitia
* †Edmondia
* †Egania – type locality for genus
** †Egania typicalis – type locality for species
* †Egorovia
** †Egorovia longituda – or unidentified related form
* †Egosiella – tentative report
* †Ehmaniella
** †Ehmaniella angustigena
** †Ehmaniella fronsplanata
* †Ekeraspis
** †Ekeraspis floweri
** †Ekeraspis nevadensis
* †Ekteinocrinus
** †Ekteinocrinus battleshipensis
* †Ekvasophyllum
* †Elassocrinus
** †Elassocrinus cyathus
** †Elassocrinus delicatulus
** †Elassocrinus inornatus
** †Elassocrinus nodosus
* †Elburgia
** †Elburgia granulosa
** †Elburgia quinnensis
* †Eleutherokomma
** †Eleutherokomma impennis – or unidentified comparable form
* †Eleutherospira
** †Eleutherospira sinistralis – type locality for species
* †Elibatocrinus
** †Elibatocrinus elongatus
* †Eliorhynchus
** †Eliorhynchus castanea
** †Eliorhynchus nevadensis
* †Elita
* †Elkoceras – type locality for genus
** †Elkoceras volborthi – type locality for species
* †Elliottella
** †Elliottella multicostata – or unidentified related form
* †Elrathina
** †Elrathina antiqua
** †Elrathina wheelera
* †Elvania
* †Elvinia
** †Elvinia roemeri
* †Elviniella
** †Elviniella laevis
* †Elythyna
* †Emanuella
** †Emanuella meristoides
* †Embolophyllum
** †Embolophyllum carbonense – type locality for species
* †Emmonsia
* †Enantiosphenella
** †Enantiosphenella cybele
* †Encrinuroides
* Fossil of the Middle Ordovician-Early Devonian trilobite Encrinurus †Encrinurus
* †Endelocrinus
** †Endelocrinus torus
* †Endophyllum
* †Endothyra
** †Endothyra bowmani – or unidentified related form
** †Endothyra excellens
** †Endothyra maxima
** †Endothyra pandorae
** †Endothyra phrissa
** †Endothyra prisca – or unidentified loosely related form
** †Endothyra tantala
* †Endothyranella
* †Endothyranopsis
** †Endothyranopsis compressus
** †Endothyranopsis crassus
** †Endothyranopsis scitula
* †Endymionia
** †Endymionia meeki – or unidentified comparable form
* †Entactinia
** †Entactinia spongia – tentative report
** †Entactinia sublata – or unidentified related form
* †Enteletes
* †Entogonites
* †Eoangyomphalus
** †Eoangyomphalus klapperi – type locality for species
* †Eochonetes
* †Eoendothyrandopsis
* †Eoendothyranopsis
** †Eoendothyranopsis donica
** †Eoendothyranopsis ermakiensis
** †Eoendothyranopsis robusta – or unidentified related form
** †Eoendothyranopsis scitula
* †Eofallotaspis – or unidentified comparable form
* †Eofalodus
** †Eofalodus brevis
* †Eofletcheria
* †Eoglossinotoechia
* †Eokochaspis – type locality for genus
** †Eokochaspis cabinensis
** †Eokochaspis delamarensis
** †Eokochaspis granulosa – type locality for species
** †Eokochaspis longspina
** †Eokochaspis metalaspis – type locality for species
** †Eokochaspis nodosa – type locality for species
** †Eokochaspis piochensis
* †Eoleperditia
** †Eoleperditia bivia
* †Eolissochonetes
** †Eolissochonetes keyesi
* †Eomarginifera
** †Eomarginifera haydensis – or unidentified comparable form
* †Eoparafusulina
** †Eoparafusulina bellula – type locality for species
** †Eoparafusulina concisa – type locality for species
** †Eoparafusulina spissa
* †Eoplectodona
* †Eoplectodonta
** †Eoplectodonta alternata
* †Eopteria
** †Eopteria richardsoni – or unidentified comparable form
* †Eoptychoparia – or unidentified comparable form
** †Eoptychoparia piochensis
* †Eorobergia
* †Eoschubertella
* †Eoschuchertella
* †Eospirifer
* †Eostaffella
** †Eostaffella tortula
* †Eotetragraptus
* †Eothele
** †Eothele spurri
* †Eotuberitina
* †Epiphyton
** †Epiphyton pencillatum – or unidentified comparable form
* †Epistacheoides
* †Eridoconcha
* †Eridopora
* †Eriella – tentative report
* †Erisocrinus
** †Erisocrinus longwelli
* †Erixanium
** †Erixanium brachyaxis
** †Erixanium carinatum
** †Erixanium multisegmentus
* †Eroicaspira
** †Eroicaspira simulatrix
* †Esmeraldina
** †Esmeraldina cometes – type locality for species
** †Esmeraldina elliptica
** †Esmeraldina lidensis – type locality for species
** †Esmeraldina rowei
* †Ethmophyllum
* †Euconia – tentative report
* †Eugonophyllum
* †Eukrinaster
** †Eukrinaster ibexensis
* †Eumetria
** †Eumetria acutirostra – or unidentified comparable form
* †Eumorphoceras
** †Eumorphoceras bisulcatum
* Fossilized shell of the Silurian-Permian sea snail Euomphalus †Euomphalus
** †Euomphalus latus
** †Euomphalus pancakensis – type locality for species
* †Euphemites
** †Euphemites crenulatus
** †Euphemites kingi
** †Euphemites nevadensis – type locality for species
* †Euphemitopsis
** †Euphemitopsis subpapillosa
* †Euptychaspis
* †Eurekablastus – type locality for genus
** †Eurekablastus ninemilensis – type locality for species
* †Eurekaspirifer – type locality for genus
** †Eurekaspirifer pinyonensis
* †Eurekia
* †Eurychilina
* †Euryzone – tentative report
* †Eustypocystis
** †Eustypocystis minor
* †Evanescirostrum
** †Evanescirostrum glabraventra
* †Exochops
** †Exochops portlocki
* †Exocrinus
** †Exocrinus moorei

## F

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Faberophyllum
* †Fallotaspidia
* Illustration of a fossil of the Cambrian trilobite Fallotaspis †Fallotaspis
** †Fallotaspis bondoni – or unidentified comparable form
* †Favosites
* †Fenestella
** †Fenestella stocktenensis
* †Fenestrellina
* †Fenestrocyathus
* †Ferganella
** †Ferganella borealis
* †Fieldaspis
** †Fieldaspis bilobata
** †Fieldaspis celer
** †Fieldaspis superba
* †Fimbrinia
** †Fimbrinia plummeri
* †Finkelnburgia – tentative report
** †Finkelnburgia scenidioides – or unidentified comparable form
* †Fistellaspongia – type locality for genus
** †Fistellaspongia inclinata – type locality for species
* †Fistulipora
** †Fistulipora bifoliatus
* †Fistutlipora
** †Fistutlipora lamellatis
* †Flabellitesia
** †Flabellitesia flabellites
* †Flexaria
** †Flexaria arkansana
* Front (left) and right side (right) views of an enrolled fossil of the Middle Ordovician-Silurian trilobite Flexicalymene †Flexicalymene
* †Fomichevella
** †Fomichevella nevadensis – type locality for species
** †Fomichevella schrenki
** †Fomichevella waltersi – type locality for species
* †Fremontia
* †Freontia
* †Fritzaspis
** †Fritzaspis generalis
** †Fritzaspis ovalis
* †Fusulinella
** †Fusulinella acuminata
** †Fusulinella fugax

## G

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Gabelia – type locality for genus
** †Gabelia fascicula
** †Gabelia giganta
** †Gabelia intermedia – type locality for species
** †Gabelia pedunculus – type locality for species
* †Gacella – tentative report
* †Gallatinospongia
** †Gallatinospongia conica
* †Gamachignathus
** †Gamachignathus ensifer
* †Gasterocoma
** †Gasterocoma bicaula – type locality for species
* †Gattendorfia – tentative report
* †Genalaticurus
** †Genalaticurus genalatus – or unidentified comparable form
* †Gennaeocrinus
** †Gennaeocrinus maxwelli – type locality for species
* Fossil of the Early-Late Ordovician trilobite Geragnostus †Geragnostus
* †Geraldinella
* †Geranocephalus
** †Geranocephalus truncatus
* †Girtyana
** †Girtyana stellara – type locality for species
* †Girtyoceras
** †Girtyoceras hamiltonense – type locality for species
* †Girtypecten
* †Girvanella
* †Glabrocingulum
** †Glabrocingulum quadrigatum
* †Glaphurochiton – tentative report
* †Glaphurus
* †Glaphyraspis
** †Glaphyraspis ornata
* †Glassia
** †Glassia triangulata
* †Globivalvulina – tentative report
* †Globoendothyra
** †Globoendothyra tomiliensis – or unidentified related form
* Glomospira
* †Glossopleura
** †Glossopleura lodensis
** †Glossopleura tuta
** †Glossopleura walcotti
* †Glyphaspis
** †Glyphaspis concavus
* †Glyptagnostus
** Fossil of the Cambrian trilobite Glyptagnostus †Glyptagnostus reticulatus
* †Glyptograptus
* †Glyptomena – tentative report
* †Glyptorthis
* †Glyptospira
** †Glyptospira arelela – type locality for species
* †Gnathodus
** †Gnathodus muricatus
** †Gnathodus simplex – or unidentified related form
* †Gogia
** †Gogia longidactylus
* †Goldfieldia – type locality for genus
** †Goldfieldia pacifica – type locality for species
* †Goniasma
* Fossilized shell of the Late Devonian-Late Triassic ammonoid cephalopod Goniatites †Goniatites
** †Goniatites americanus
** †Goniatites deceptus
** †Goniatites eganensis – type locality for species
** †Goniatites sowerbyi – type locality for species
* †Goniophrys – tentative report
* †Goniotelina
** †Goniotelina ensifer
* †Goniotrypa
* †Gosseletina – tentative report
* †Grabaulites
** †Grabaulites jacksoni – or unidentified comparable form
* †Gracianella
* †Grammatodon
** †Grammatodon politus
* †Grandaurispina – or unidentified comparable form
** †Grandaurispina type locality for species A – informal
* †Grandinasus
** †Grandinasus argentus
** †Grandinasus auricampus
** †Grandinasus patulus
* †Granulifera
** †Granulifera granulosa
* †Graphiocrinus
** †Graphiocrinus scopulus
* †Graphiodactyllis
* †Groomodiscus – type locality for genus
** †Groomodiscus rossi – type locality for species
* †Grovesella
** †Grovesella nevadensis – type locality for species
** †Grovesella tabasensis
* †Gryphochiton
** †Gryphochiton distinctus – type locality for species
* †Grypophyllum
* †Gypidula
** †Gypidula loweryi
** †Gypidula praeloweryi – type locality for species
** †Gypidula pseudogaleata – or unidentified comparable form
* †Gypidulina
** †Gypidulina Sp. C – informal
* Fossilized shell of the Carboniferous-Permian brachiopod Gypospirifer †Gypospirifer
** †Gypospirifer infraplicus – or unidentified comparable form

## H

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Hadrocephalites
** †Hadrocephalites lyndonensis
** †Hadrocephalites rhytidodes
* †Hadropipetta
** †Hadropipetta nevadensis – type locality for species
* †Hadrorhynchia
** †Hadrorhynchia sandersoni
* †Hadrotreta
** †Hadrotreta primaaea
* Fossil of the Ordovician-Silurian tabulate coral Halysites †Halysites
* †Hamarodus
** †Hamarodus europaeus
* †Hammatospira – type locality for genus
** †Hammatospira bellula – type locality for species
* †Hammatostroma
* †Haplistion
** †Haplistion aeluroglossa
** †Haplistion sphaericum – or unidentified comparable form
* †Hapsiphyllum
* †Hardyoides
** †Hardyoides mimicus
* †Harklessia – type locality for genus
** †Harklessia yuenglingensis – type locality for species
* †Harpillaenus
** †Harpillaenus rossi – type locality for species
* †Hebetoechia
* †Heckethornia
** †Heckethornia bowiei
** †Heckethornia hyndeae – type locality for species
** †Heckethornia morrisseyi
** †Heckethornia numani – type locality for species
* †Hedeina
* †Hedinaspis
** †Hedinaspis regalis
* †Hedraites – tentative report
* †Heintzella
** †Heintzella davydovi – type locality for species
** †Heintzella playfordi – type locality for species
** †Heintzella radiata – or unidentified comparable form
** †Heintzella whitneyi
* Life restoration of the Permian Chimaera relative Helicoprion †Helicoprion
** †Helicoprion bessonowi
* †Helicotis – tentative report
* †Helicotoma
* †Heliomera
** †Heliomera albata – or unidentified comparable form
* †Helminthochiton
* †Hemiarges – tentative report
* †Hemiptychina
** †Hemiptychina quadricostata
* †Heritschiella
** †Heritschiella girtyi
* †Hermatostroma
* †Hesperinia
** †Hesperinia kirki – type locality for species
* †Hesperocoelia
** †Hesperocoelia typicalis
* †Hesperomena
** †Hesperomena leptellinoidea
* †Hesperonomia
** †Hesperonomia antelopensis
** †Hesperonomia crassa – or unidentified comparable form
** †Hesperonomia iones
** †Hesperonomia nemea – or unidentified comparable form
** †Hesperonomia planidorsalis – or unidentified comparable form
* †Hesperonomiella
** †Hesperonomiella minor
* †Hesperorthis
** †Hesperorthis antelopensis – or unidentified comparable form
** †Hesperorthis matutina – or unidentified comparable form
* †Heteralosia
** †Heteralosia slocomi
* †Heterelasma
** †Heterelasma type locality for species A – informal
* †Heterocaninia – tentative report
** †Heterocaninia langenheimi
* †Heteropecten
** †Heteropecten vanvleeti
* †Heterophrentis
* †Hexatractiella
** †Hexatractiella nevadensis
* †Highgatella
** †Highgatella cordilleri
* †Hillyardina – tentative report
* †Hinganella
** †Hinganella felderi – type locality for species
* †Hintzeia
** †Hintzeia celsaora
* †Hiscobeccus
** †Hiscobeccus capax
** †Hiscobeccus gigas
* †Holcocystis
** †Holcocystis flexa
* †Holmiella
** †Holmiella falx
** †Holmiella millerensis
* †Homagnostus
** †Homagnostus comptus – type locality for species
** †Homagnostus lumidosus
** †Homagnostus obesus
* †Homograptus
* †Homotelus
* †Homotrypa
* †Housia
** †Housia ovata
* †Howellella
** †Howellella cycloptera
** †Howellella textilis – or unidentified comparable form
* †Hunnebergia – tentative report
* †Hustedia
** †Hustedia culcitula
** †Hustedia elongata
** †Hustedia gibbosa
** †Hustedia miseri
** †Hustedia mormoni – or unidentified comparable form
** †Hustedia rotundi
** †Hustedia stataria
* †Hyalostelia
* †Hyolithellus
** †Hyolithellus insolitus
* †Hyolithes
* †Hyperchilarina
* †Hypermecaspis
** †Hypermecaspis kolouros
* †Hypochilarina – tentative report
* Life restoration of the Middle Ordovician trilobite Hypodicranotus †Hypodicranotus
* †Hypothyridina
* †Hypselentoma – tentative report
* †Hypsiptycha
** †Hypsiptycha anticostiensis – or unidentified comparable form
* †Hysterolites
* †Hystriculina
** †Hystriculina hystricula
** †Hystriculina type locality for species A – informal
** †Hystriculina wabashensis
* †Hystricurus
** †Hystricurus oculilunatus – or unidentified comparable form

## I

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Ianthinopsis
* †Iapetognathus
** †Iapetognathus sprakersi
* †Ichodella
* †Icriodus
** †Icriodus angustus – or unidentified comparable form
** †Icriodus brevis
** †Icriodus difficilis
** †Icriodus hesperius
** †Icriodus latericrescens
** †Icriodus nevadensis
** †Icriodus norfordi
** †Icriodus trojani
* †Iddingsia
** †Iddingsia robusta
** †Iddingsia similis
* †Idiomesus
* †Idiostroma
* †Idiostrophia
** †Idiostrophia conciliata
** †Idiostrophia lenticularis – type locality for species
** †Idiostrophia nuda
** †Idiostrophia paucicostata – or unidentified comparable form
** †Idiostrophia valdari – type locality for species
* Fossil of the Middle Ordovician trilobite Illaenus †Illaenus
** †Illaenus alveatus – or unidentified comparable form
** †Illaenus auriculatus
** †Illaenus fraternus – or unidentified comparable form
** †Illaenus oscitatus – tentative report
** †Illaenus utahensis
* †Ilmenia
* †Imitoceras
* †Indivisia – tentative report
* †Inflatia
* †Ingria
** †Ingria cloudi
* †Innitagnostus
** †Innitagnostus inexpectans
* †Intomodesma – tentative report
* †Invertrypa
** †Invertrypa subnuba
** †Invertrypa talis – type locality for species
* †Iridistrophia
* †Irvingella
** †Irvingella angustilimbatus
** †Irvingella flohri
** †Irvingella major
** †Irvingella transversa
* †Isbergia
* †Ischyrophyma – tentative report
* †Ischyrotoma
** †Ischyrotoma juabensis
** †Ischyrotoma stubblefieldi
* †Isochilina
* †Isograptus
* †Isophragma – tentative report
* †Isorthis
* †Isoteloides
* Fossil of the Middle-Late Ordovician giant trilobite Isotelus. †Isotelus
** †Isotelus copenhagenensis
** †Isotelus spurius
* †Ivanovia

## J

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Jedria
* †Jeffersonia
* †Jefina
* †Johnsonetes – report made of unidentified related form or using admittedly obsolete nomenclature
** †Johnsonetes filistriata
* †Juresania
** †Juresania ovalis – or unidentified comparable form
** †Juresania rectangularis – or unidentified comparable form

## K

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Kainella
** †Kainella flagricauda
* †Kalimnasphaera
** †Kalimnasphaera maculosa – or unidentified related form
* †Kallimorphocrinus
** †Kallimorphocrinus eaglei
* †Kanoshia
** †Kanoshia reticulata
* †Kaskia
* †Katuniella – tentative report
* †Kawina
** †Kawina wilsoni – type locality for species
* †Kazakhoceras
** †Kazakhoceras bylundi
* †Keriocyathus – type locality for genus
** †Keriocyathus arachnaius – type locality for species
* †Kindbladia
** †Kindbladia affinis
* †Kingopora
** †Kingopora ehrenbergi – or unidentified comparable form
** †Kingopora inflata – type locality for species
** †Kingopora wardlawiensa – type locality for species
* †Kistocare
** †Kistocare campbellensis – type locality for species
* †Kitikamispira
** †Kitikamispira minuitinodosa
* †Kleopatrina
** †Kleopatrina arcturusensis – type locality for species
** †Kleopatrina ftatateeta
** †Kleopatrina grandis
** †Kleopatrina magnifica
** †Kleopatrina simplex
* †Kloedenellitina – tentative report
* †Knightina
* †Knoxiella – tentative report
* †Kochaspis
** †Kochaspis augusta
** †Kochaspis liliana
* †Kochiella
** †Kochiella augusta
** †Kochiella brevaspis
** †Kochiella maxeyi
* †Kochiellina
** †Kochiellina groomensis
** †Kochiellina janglensis
* †Kochina
** †Kochina walcotti – type locality for species
* †Kochiproductus
* †Komaspidella
** †Komaspidella occidentalis – type locality for species
* †Kometia – tentative report
* †Komia
** †Komia eganensis
* †Komiella
** †Komiella magnasulca
* †Koneprusia
* †Konickophyllum
* †Koninckophyllum
* Fossil of the Cambrian trilobite Kootenia †Kootenia
** †Kootenia acicularis
** †Kootenia aculacauda – type locality for species
** †Kootenia brevispina
** †Kootenia convoluta
** †Kootenia crassa
** †Kootenia crassinucha – type locality for species
** †Kootenia dawsoni
** †Kootenia germana
* †Kormagnostella
** †Kormagnostella advena
* †Kozlowskia
** †Kozlowskia haydenensis
** †Kozlowskia kingi
** †Kozlowskia splendens
* †Kozlowskiellina
* †Kozlowwkiella
** †Kozlowwkiella lazarei
* †Krausella
* †Krotovia
** †Krotovia globosa – or unidentified related form
** †Krotovia knighti
* †Kutorginella
** †Kutorginella lasallensis
** †Kutorginella pseudantiquatonia – type locality for species
* †Kuvelousia
** †Kuvelousia leptosa
* †Kyrshabaktella

## L

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Labiostria
** †Labiostria westropi
* †Lachnostoma
** †Lachnostoma latucelsum
* †Ladatheca
** †Ladatheca cylindrica
* †Ladjia
** †Ladjia cordillera – type locality for species
** †Ladjia russelli
** †Ladjia saltica – or unidentified comparable form
* †Ladogioides
** †Ladogioides pax – or unidentified comparable form
* †Laeogyra – or unidentified comparable form
* †Lamellospira
* †Landercyathus – type locality for genus
** †Landercyathus lewandowskii – type locality for species
* †Laticrura
** †Laticrura heteropleura – or unidentified comparable form
* †Latiendothyra
* †Laurentoscandodus
** †Laurentoscandodus triangularis
* †Lebobienvillia
* †Leeites
** †Leeites leei – type locality for species
* †Lehua
** †Lehua argus – or unidentified related form
* †Leiorhynchus
** †Leiorhynchus carboniferum
** †Leiorhynchus hippocastanea
** †Leiorhynchus miriam
** †Leiorhynchus nevadensis – or unidentified comparable form
** †Leiorhynchus rhabdotum – or unidentified comparable form
* †Leiostegium
** †Leiostegium goodwinensis
* †Leiostrototropis – tentative report
* †Lensotreta – type locality for genus
** †Lensotreta perplexa – type locality for species
* †Leonardoceras
** †Leonardoceras parvum
* Fossil of the Late Ordovician-Middle Devonian trilobite Leonaspis †Leonaspis
* †Leperditella
** †Leperditella incisa – or unidentified comparable form
** †Leperditella tumida – or unidentified comparable form
** †Leperditella valida
* †Lepetopsis
** †Lepetopsis franae – type locality for species
* †Lepidocyclus
* †Lepidoleptaena
* †Leptaena
** †Leptaena acuticuspidata – or unidentified comparable form
** †Leptaena ordovicica – or unidentified comparable form
* †Leptaenisca
* †Leptathyris
** †Leptathyris circula
** †Leptathyris index
** †Leptathyris obsolescens
* †Leptella
** †Leptella austrina – type locality for species
** †Leptella nevadensis
* †Leptellina
** †Leptellina occidentalis
* †Leptobolus – tentative report
* †Leptocoelia
** †Leptocoelia murphyi – type locality for species
* †Leptocoelina
** †Leptocoelina squamosa – type locality for species
* †Leptodesma
* †Leptomphalus
** †Leptomphalus arcturus – type locality for species
* †Leptostrophia
** †Leptostrophia beckii – or unidentified comparable form
** †Leptostrophia inequicostella
* †Lesueurilla
* †Leurosina
** †Leurosina sinesulca
* †Levenea
** †Levenea fagerholmi – type locality for species
** †Levenea navicula – type locality for species
* †Lichenaria
* †Licnocephala
** †Licnocephala cavigladius
* †Lidaconus – type locality for genus
** †Lidaconus palmettoensis – type locality for species
* †Limipecten
* †Lingula
** †Lingula carbonaria – or unidentified comparable form
* Illustration of a fossilized shell of the Cambrian-Late Ordovician brachiopod Lingulella †Lingulella
* †Linipalus
** †Linipalus magnispinus – or unidentified related form
* †Linnarssonella
* †Linnarssonia
* †Linoproductus
** †Linoproductus ovata
** †Linoproductus planiventralis
** †Linoproductus prattenianus
** †Linoproductus prottenianus
* †Liocheina
* †Liricamera
** †Liricamera nevadensis
* †Lissatrypa – tentative report
* †Lissochonetes
* †Lissocoelia
** †Lissocoelia cylindrica – type locality for species
** †Lissocoelia ramosa
* †Listroa
** †Listroa toxoura
* †Lithostrotionella
** †Lithostrotionella castelnaui
* †Litocephalus
** †Litocephalus bilobatus
** †Litocephalus granulomarginatus
** †Litocephalus magnus
** †Litocephalus verruculapeza
* †Lobocorallium
** †Lobocorallium trilobatum
* †Lobosiphon
* †Lodanaria – report made of unidentified related form or using admittedly obsolete nomenclature
** †Lodanaria floryi
* †Loganograptus
* †Lomatopisthia – tentative report
* Fossil of the Ordovician trilobite Lonchodomas †Lonchodomas
* †Lophonema
** †Lophonema frydai
* †Lophophyllum – tentative report
* †Lophospira
** †Lophospira perangulata
* †Lotagnostus
** †Lotagnostus trisectus – or unidentified comparable form
* †Loxonema
** †Loxonema walcotti – type locality for species
* †Lunulazona
* †Lutulentus
** †Lutulentus muralspineus
* †Lyrielasma
* †Lytvophyllum – tentative report

## M

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Macannaia
** †Macannaia maladensis
* †Macgeea
* †Machaeraria
* †Mackenziecyathus
** †Mackenziecyathus bukryi
* †Macluritella – tentative report
** †Macluritella gyroceras – or unidentified comparable form
* †Maclurites
** †Maclurites magnus
* †Macrocyproides
* †Madaraspis
** †Madaraspis magnifica
* †Malayaspira
** †Malayaspira annulata
** †Malayaspira hintzei
* †Mametella
* †Manzanella
* †Marginia
** †Marginia ivanovae – or unidentified comparable form
* †Marginovatia
** †Marginovatia catinulus
** †Marginovatia eurekensis
* †Martinia
* †Martiniopsis – tentative report
* †Mauryella
* †Mccloudius
** †Mccloudius parvus – type locality for species
* †Mclearnites
** †Mclearnites invasor
* †Meekella
** †Meekella attenuata
** †Meekella striatocostata
* †Meekopinna
** †Meekopinna sagitta
* †Meekopora
* †Meekospira
* †Megakozlowskiella
** †Megakozlowskiella magnapleura – type locality for species
** †Megakozlowskiella raricosta – or unidentified comparable form
* †Megalaspidella – tentative report
* †Megalaspides
* †Megastrophia
** †Megastrophia iddingsi
** †Megastrophia transitans
* Fossil of the Cambrian-Silurian trilobite Megistaspis †Megistaspis
* †Meristella
** †Meristella robertsensis
* †Meristina
* †Merriamites
** †Merriamites eurekae
* †Mesodouvillina
** †Mesodouvillina varistriata – or unidentified comparable form
* †Mesolobus
* †Mesopholidostrophia – tentative report
* †Mesoschubertella
** †Mesoschubertella mullerriedi
* †Mesotrypa
* †Metabolograptus
** †Metabolograptus persculptus
* Fossilized shell of the Carboniferous-Permian nautiloid cephalopod Metacoceras †Metacoceras
* †Metadimorphoceras
** †Metadimorphoceras richardsi – type locality for species
* †Metaldetes
* †Metaplasia
** †Metaplasia paucicostata – or unidentified comparable form
* †Metrionaxon
* †Mexicaspis
** †Mexicaspis difuntosensis
* †Mexicella
** †Mexicella antelopea
** †Mexicella grandoculus – tentative report
** †Mexicella granulata – type locality for species
** †Mexicella mexicana
** †Mexicella robusta
** †Mexicella stator
* †Michelinia
** †Michelinia meekana
* †Michelinoceras
** †Michelinoceras wilsoni
* †Microcardinalia
* †Microcheinella
** †Microcheinella peculiaris – or unidentified comparable form
* †Microdoma
* †Micromitra
* †Microplasma
* †Microryctocara
** †Microryctocara nevadensis
* †Milleratia – tentative report
* †Millerella
** †Millerella marblensis
* †Mimatrypa
* †Mimospira
** †Mimospira helmhackeri – or unidentified related form
* †Minervaecystis – tentative report
* †Minupeltis
** †Minupeltis conservator
* †Minycardita – type locality for genus
** †Minycardita sectilis – type locality for species
* †Missisquoia
* †Mizzia
** †Mizzia yabei – or unidentified comparable form
* †Moapacrinus
** †Moapacrinus inornatus
** †Moapacrinus rotundatus
** †Modiolus nevadensis
* †Modiomorpha – tentative report
** †Modiomorpha pintoensis
* †Molybdocyathus – type locality for genus
** †Molybdocyathus juvenilis – type locality for species
* †Monocraterion
* Fossils of the Early Devonian graptolite Monograptus †Monograptus
** †Monograptus angustidens
** †Monograptus birchensis
** †Monograptus hercynicus
** †Monograptus thomasi
** †Monograptus uniformis
** †Monograptus yukonensis
* †Mononusphaericorhynchus
** †Mononusphaericorhynchus sartenaeri
* †Monotiopleura
* †Montezumaspis
** †Montezumaspis cometes
** †Montezumaspis parallela
* †Monticuliporella
* †Moorefieldella
** †Moorefieldella eurekensis
* †Mooreoceras
* †Morinorhynchus
* †Morosa
** †Morosa brevispina
** †Morosa definita
** †Morosa extensa
** †Morosa longispina
* †Morozoviella – type locality for genus
** †Morozoviella curriensis – type locality for species
** †Morozoviella praecurriensis – type locality for species
* †Moscovicrinus
** †Moscovicrinus bipinnatus
* †Mourlonia
** †Mourlonia type locality for species A – informal
* †Mucophyllum
** †Mucophyllum oliveri
* †Multicostella
* †Multioistodus
* †Multithecopora
** †Multithecopora hypatiae
* †Murchisonia
** †Murchisonia megathanae – type locality for species
** †Murchisonia tillesae – type locality for species
* †Mutationella – tentative report
* †Myalina
* †Mytilarca

## N

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Nadiastrophia
* †Nanicella
* †Nanillaenus
* †Nankinella
* †Nanorthis
** †Nanorthis hamburgensis
* †Nardophyllum
* Fossilized shell of the Early Devonian – Triassic sea snail Naticopsis †Naticopsis
** †Naticopsis glomerosa – type locality for species
** †Naticopsis inornata
** †Naticopsis kaibabensis
* †Neaxon
* †Neilsonia
** †Neilsonia welleri – or unidentified comparable form
* †Nemesa
** †Nemesa cimex – type locality for species
* †Neoarchaediscus
* †Neochonetes
** †Neochonetes acanthoporus
** †Neochonetes dominus
** †Neochonetes granulifer
* †Neoeridotrypella
** †Neoeridotrypella schilti – type locality for species
* †Neomphyma
** †Neomphyma karpinskiense
** †Neomphyma nevadense
* †Neomultithecopora
** †Neomultithecopora mccutcheonae – type locality for species
* †Neopanderodus
* Fossilized shell of the Carboniferous-Permian brachiopod Neospirifer †Neospirifer
** †Neospirifer cameratus
** †Neospirifer dunbari
** †Neospirifer gorei
** †Neospirifer goreii
** †Neospirifer latus – or unidentified comparable form
** †Neospirifer triplicatus
* †Neosyringopora
** †Neosyringopora multattenuata
* †Neozeacrinus
** †Neozeacrinus coronulus
** †Neozeacrinus wanneri
* Fossil of the Cambrian trilobite Nephrolenellus †Nephrolenellus
** †Nephrolenellus geniculatus
** †Nephrolenellus greniculatus – type locality for species
* †Nervostrophia
* †Nevadacrinus
** †Nevadacrinus geniculatus
* †Nevadaspira – type locality for genus
** †Nevadaspira cooperi – type locality for species
* †Nevadatubulus – type locality for genus
** †Nevadatubulus dunfee – type locality for species
* †Nevadella
** †Nevadella eucharis
* Fossil of the Cambrian trilobite Nevadia †Nevadia
** †Nevadia parvoconica
** †Nevadia weeksi
* †Nevadoceras
** †Nevadoceras steelei – type locality for species
* †Nevadocoelia
** †Nevadocoelia grandis
** †Nevadocoelia pulchrata
** †Nevadocoelia traini
** †Nevadocoelia wistae
* †Newberria
* †Nicholsonella – tentative report
* †Nicklesopora
** †Nicklesopora avia
* †Nicolella – tentative report
* †Nicollidina
** †Nicollidina brevis
* †Nielsonia – or unidentified related form
* †Nileus
** †Nileus hesperaffinis
** †Nileus scrutator – or unidentified related form
* †Niobe
** †Niobe quadraticaudata – or unidentified comparable form
* †Niobella
* †Nisusia – tentative report
* †Noblella
** †Noblella tremadociensis – type locality for species
* †Normalograptus
** †Normalograptus ajjeri
** †Normalograptus angustus
** †Normalograptus elegantulus
** †Normalograptus extraordinarius
** †Normalograptus myrniensis
** †Normalograptus ojsuensis
* †Nothorthis – tentative report
* †Notopeltis
** †Notopeltis orthometopa
* †Nucleospira
** †Nucleospira subsphaerica – type locality for species
* †Nuculavus
** †Nuculavus levatiformis
* †Nuculoidea
* †Nuculopsis
** †Nuculopsis darlingensis – or unidentified comparable form
** †Nuculopsis girtyi
** †Nuculopsis levatiformis
* †Nuia
* †Nyctopora
* †Nyella
** †Nyella clinolimbata
** †Nyella granosa
** †Nyella immoderata
** †Nyella plana
** †Nyella rara

## O

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* Illustration of fossils of the Cambrian brachiopod Obolella †Obolella
* †Obolus
* †Odontospirifer
** †Odontospirifer type locality for species A – informal
* †Oepikina
* †Ogygopsis
** †Ogygopsis batis
** †Ogygopsis typicalis
* †Oistodus
** †Oistodus contractus
** †Oistodus lanceolatus – or unidentified comparable form
* †Oklahomacrinus
** †Oklahomacrinus triangulus
* †Olenaspella
** †Olenaspella paucisegmenta
** †Olenaspella regularis
** †Olenaspella separata – type locality for species
* Restoration of the Cambrian trilobite Olenellus †Olenellus
** †Olenellus chiefensis – type locality for species
** †Olenellus clarki
** †Olenellus fowleri – type locality for species
** †Olenellus fremonti – or unidentified comparable form
** †Olenellus gilberti
** †Olenellus howelli
** †Olenellus multinodus
** †Olenellus puertoblancoensis – tentative report
** †Olenellus terminatus – type locality for species
* Fossil preserving carbon films left by the legs and antennae of the Cambrian trilobite Olenoides †Olenoides
** †Olenoides maladensis
** †Olenoides steptoensis – type locality for species
* †Olenus
** †Olenus wilsoni
* †Oligometopus
** †Oligometopus contractus
* †Ollenellus
** †Ollenellus gilberti
* †Omphalocirrus – tentative report
* †Omphalotrochus
* †Onchocephalites
** †Onchocephalites claytonensis – type locality for species
* †Onchocephalus
** †Onchocephalus maior – or unidentified comparable form
** †Onchocephalus major – or unidentified comparable form
** †Onchocephalus palupus – type locality for species
* †Oncochilus
* †Onuphlonella – tentative report
* †Onychoplecia – tentative report
* †Ophioxenikos
** †Ophioxenikos langenheimi
* †Opikina
* †Opipeuter
* †Opisthotreta
** †Opisthotreta indistincta – type locality for species
** †Opisthotreta transversa – type locality for species
* †Opsiosoryctocephalus – type locality for genus
** †Opsiosoryctocephalus ophis – type locality for species
* †Orbiculoidea
** †Orbiculoidea capuliformis
** †Orbiculoidea missouriensis
** †Orbiculoidea moorefieldana – or unidentified related form
* †Orecopia
** †Orecopia mccoyi
* †Oriostoma
** †Oriostoma gerbaulti
* †Oriskania
* †Orthambonites
** †Orthambonites bifurcatus
** †Orthambonites decipiens – or unidentified comparable form
** †Orthambonites dinorthoides
** †Orthambonites eucharis
** †Orthambonites mazourkaensis – or unidentified comparable form
** †Orthambonites minisculus
** †Orthambonites minusculus
** †Orthambonites patulus
** †Orthambonites paucicostatus
** †Orthambonites subulata
* †Orthidiella
** †Orthidiella carinata
** †Orthidiella costellata
** †Orthidiella extensa
** †Orthidiella longwelli
* †Orthidium
** †Orthidium bellulum
** †Orthidium fimbriatum – or unidentified related form
* †Orthis
* †Orthoceras
* †Orthograptus
** †Orthograptus calcaratus
** †Orthograptus truncatus
* †Orthonema
* †Orthonychia
** †Orthonychia occidens
* †Orthoretiolites
** †Orthoretiolites hami
* †Orthostrophella
** †Orthostrophella monitorensis – type locality for species
* †Orthostrophia
* †Orthotetes
** †Orthotetes kaskaskiensis
** †Orthotetes occidentalis
* †Orthotichia – tentative report
* †Orthovertella
* †Orulgania
* †Oryctocephalina
** †Oryctocephalina maladensis – tentative report
* †Oryctocephalites
** †Oryctocephalites claytonensis – type locality for species
** †Oryctocephalites palmeri
** †Oryctocephalites rasettii
** †Oryctocephalites runcinatus
** †Oryctocephalites typicalis
* †Oryctocephalus
** †Oryctocephalus americanus – type locality for species
** †Oryctocephalus indicus
** †Oryctocephalus maladensis
** †Oryctocephalus nyensis
** †Oryctocephalus orientalis
** †Oryctocephalus primus
* †Otarion
* Life restoration of the Cambrian priapulid worm relative Ottoia †Ottoia
* †Ottoseetaxis
* †Oulodus
** †Oulodus rohneri
** †Oulodus ulrichi
* †Ovatia
** †Ovatia latior – or unidentified comparable form
** †Ovatia nodosa
* †Ovatoryctocara – tentative report
* †Oxoplecia
** †Oxoplecia monitorensis
** †Oxoplecia nevadensis
* †Oxyspira – type locality for genus
** †Oxyspira murphyi – type locality for species
* †Ozarkodina
** †Ozarkodina hassi
** †Ozarkodina oldhamensis – tentative report
** †Ozarkodina raaschi
** †Ozarkodina tenuis – or unidentified comparable form

## P

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Pachyaspis
** †Pachyaspis gallagari – type locality for species
** †Pachyaspis longa – type locality for species
* †Pachyconulus
** †Pachyconulus parvalus
* †Pachydictya
* †Pachyfavosites
* †Pachyphyllum
* †Pachystrophia
* †Pacificocoelia
** †Pacificocoelia infrequens
* †Paeckelmanella
* †Paedeumias
** †Paedeumias granulatus – type locality for species
** †Paedeumias nevadensis – tentative report
* †Paenebeltella
* Fossil of the Cambrian trilobite Pagetia †Pagetia
** †Pagetia arenosa
** †Pagetia clytia
** †Pagetia maladensis
** †Pagetia mucrogena
** †Pagetia prolata
** †Pagetia resseri
** †Pagetia rugosa
* †Paladin
* †Palaeocapulus
** †Palaeocapulus piso
* †Palaeocyclus
** †Palaeocyclus eurylophus
* †Palaeoneilo
** †Palaeoneilo mcchesneyana
* †Palaeophippium
** †Palaeophippium octaramosum – type locality for species
* †Palaeophyllum
* †Palaeosphaera – type locality for genus
** †Palaeosphaera micra – type locality for species
* †Palaeostylus
* †Palaeotextularia
** †Palaeotextularia consobrina – or unidentified loosely related form
* †Palaeotrifidus – type locality for genus
** †Palaeotrifidus ballator – type locality for species
** †Palaeotrifidus imbifurcus – type locality for species
* †Palaeotripus
** †Palaeotripus sexabrachiatus – type locality for species
* †Paleofavosites
* †Paleoneilo
* †Palliseria – type locality for genus
** †Palliseria longwelli – type locality for species
** †Palliseria robusta
* †Palmettaspis – type locality for genus
** †Palmettaspis consorta – type locality for species
** †Palmettaspis lidensis
** †Palmettaspis parallela – type locality for species
* †Paltodus
* †Pamchonetes
** †Pamchonetes macrostriatus
* †Panacus – type locality for genus
** †Panacus palmeri – type locality for species
* †Pancus – type locality for genus
** †Pancus palmeri – type locality for species
* †Panderodus
** †Panderodus feulneri
** †Panderodus unicostatus
* †Pandorinellian
** †Pandorinellian linguiformis
* †Pandorinellina
** †Pandorinellina angustinpennatus – or unidentified comparable form
** †Pandorinellina angustipennatus – or unidentified comparable form
** †Pandorinellina exigua
** †Pandorinellina expansa
** †Pandorinellina linguiformis
** †Pandorinellina steinhornensis
* †Papiliophyllum
** †Papiliophyllum murphyi
** †Papiliophyllum vescum
* †Paraantagmus
** †Paraantagmus latus
* †Parabellefontia
** †Parabellefontia concinna – or unidentified comparable form
* †Parabolablastus
** †Parabolablastus elongatus – type locality for species
* †Parabolinella
** †Parabolinella hecuba
** †Parabolinella tumifrons – or unidentified comparable form
* †Paracaligelloides
* †Parachaetes
* †Parachonetes
** †Parachonetes macrostriatus
* †Paraconularia
* †Paracrothyris
* †Paracyclas
* †Parafafallotaspis
* †Parafallotaspis
* †Parafusulina
* †Paragloborilus
* †Paraheritschioides
** †Paraheritschioides californiense
** †Paraheritschioides fergusonensis – type locality for species
** †Paraheritschioides grandis
** †Paraheritschioides nevadaensis – type locality for species
** †Paraheritschioides stevensi
* †Parahousia
** †Parahousia constricta
** †Parahousia subequalis
* †Parahystricurus
* †Parajuresania
** †Parajuresania nebrascensis
* †Paralbertella
** †Paralbertella bosworthi
** †Paralbertella bosworthy
* †Paralenorthis
** †Paralenorthis marshalli
* †Parallelodon
** †Parallelodon truncatus – or unidentified related form
* †Paramillerella
** †Paramillerella inflecta
** †Paramillerella pressa
* †Paranacyathus
* †Paranevadella
* †Paraorthograptus
** †Paraorthograptus pacificus
** †Paraorthograptus uniformis
* †Paraparchites
** †Paraparchites cyclopeus – or unidentified related form
** †Paraparchites nickelsi – or unidentified comparable form
* †Paraperrinites
** †Paraperrinites subcumminsi – type locality for species
* †Parapholidostrophia – type locality for genus
** †Parapholidostrophia harperi – type locality for species
* †Paraplegmatograptus
** †Paraplegmatograptus uniformis
* †Paraporcellia
** †Paraporcellia rohri
* †Parapoulsenia
** †Parapoulsenia lata – or unidentified comparable form
* †Parapugnax
** †Parapugnax bactrianense – type locality for species
* †Pararachnastraea
** †Pararachnastraea illipahensis – type locality for species
** †Pararachnastraea moormanensis – type locality for species
* †Parareteograptus
** †Parareteograptus parvus
** †Parareteograptus sinensis
** †Parareteograptus turgidus
* †Pararhizophyllum – type locality for genus
** †Pararhizophyllum parvulum – type locality for species
* †Paraschmidtella – tentative report
* †Parastringocephalus
* †Parastrophina – tentative report
* †Parathuramina
* †Paratikhinella
* †Parechidnina
** †Parechidnina nevadensis – type locality for species
* †Parenthatia
* †Parethelocrinus
** †Parethelocrinus rectilatus
* †Pareuloma
* †Parkaspis
** †Parkaspis drumensis
* †Parkula
** †Parkula esmeraldina – type locality for species
* †Paroistodus – tentative report
* †Patellispongia
** †Patellispongia brosiusae – type locality for species
** †Patellispongia oculata
* †Paterina
* †Paterula
* †Paterulus
* †Patriaspirifer
** †Patriaspirifer kobehana
* †Paucicostella – tentative report
* †Paucicrura
** †Paucicrura cristifera
** †Paucicrura subplana – or unidentified comparable form
* †Paucispinifera – tentative report
* Life restoration of the Cambrian trilobite Peachella †Peachella
** †Peachella iddingsi
* †Peelerophon – tentative report
* †Pegmarhynchia
* †Pelagiella
* †Pelekygnathus
** †Pelekygnathus linguiformis
** †Pelekygnathus parawebbi
** †Pelekygnathus pseudofoliatus
** †Pelekygnathus xylus
* †Pelekysgnathus
** †Pelekysgnathus angustipennatus
** †Pelekysgnathus eiflius
** †Pelekysgnathus intermedius
** †Pelekysgnathus linguiformis
** †Pelekysgnathus parawebbi
** †Pelekysgnathus pseudofoliatus
** †Pelekysgnathus robusticostatus
** †Pelekysgnathus trigonicus
* †Peltabellia – tentative report
* †Peniculauris
** †Peniculauris ivesi
* †Penniretepora
** †Penniretepora oppositus
** †Penniretepora trilineata
* †Pentamerella
** †Pentamerella davidsoni – or unidentified comparable form
** †Pentamerella wintereri
* †Pentamerifera
* †Pentameroides
* Fossilized shell of the Silurian-Middle Devonian brachiopod Pentamerus †Pentamerus
* †Pentaxocrinus
** †Pentaxocrinus quinarius
* †Pentlandella
* †Pentlandia
** †Pentlandia merriami – type locality for species
* †Pentremites
* †Peraspis
** †Peraspis erugata
* †Pericyclus
** †Pericyclus antelopensis – type locality for species
** †Pericyclus filaris
* †Perimestocrinus
** †Perimestocrinus nevadensis
** †Perimestocrinus oasis
* †Periodon
** †Periodon aculeatus – tentative report
* †Perischoclonus
* †Perissopliomera
** †Perissopliomera maclachlani
* †Perissopyge
** †Perissopyge triangulata
* †Permastraea
** †Permastraea biseptata – type locality for species
** †Permastraea buttensis – type locality for species
** †Permastraea campophylloides
** †Permastraea nevadensis – type locality for species
* †Permocalculus
* †Permophorus
* †Pernopecten
* Assemblage of fossils of the Cambrian trilobite Itagnostus interstrictus, until recently known as Peronopsis interstricta †Peronopsis
** †Peronopsis amplaxis
** †Peronopsis bonnerensis
** †Peronopsis brighamensis
** †Peronopsis fallax
** †Peronopsis segmenta
* †Perspicaris
* †Peruvispira
** †Peruvispira boreala – type locality for species
* †Petalaxis
** †Petalaxis elyensis – type locality for species
** †Petalaxis exiguus
** †Petalaxis mokomokensis – type locality for species
** †Petalaxis occidentalis
* †Petalocystites
* †Petasmatherus
** †Petasmatherus type locality for species A – informal
* †Petigurus
** †Petigurus inexpectatus
* †Petrochus
* †Petschoracrinus – tentative report
* Fossil of the Late Ordovician-Late Devonian trilobite Phacops †Phacops
* †Phalacroma
* †Phanocrinus – tentative report
** †Phanocrinus insolitus
* †Phenacocyclas
* †Phestia
** †Phestia perumbonata
* †Phillipsia
** †Phillipsia peroccidens
* †Pholidostrophia
* †Phormograptus
** †Phormograptus conectus
** †Phormograptus connectus
* †Phragmodus
** †Phragmodus undatus
* Spadella cephaloptera †Phragmophora
* †Phragmorthis
** †Phragmorthis antiqua – type locality for species
* †Phragmostrophia
** †Phragmostrophia merriami – type locality for species
* †Phrenophoria
** †Phrenophoria type locality for species A – informal
** †Phrenophoria type locality for species B – informal
* †Phricodothyris
* †Phricodythyris
** †Phricodythyris perplexa
* †Phrycodothyris
** †Phrycodothyris perplexa
* †Phyllocystis
* †Phyllodictya
** †Phyllodictya crystallaria – or unidentified comparable form
* Fossil of the Early Ordovician graptolite Phyllograptus †Phyllograptus
** †Phyllograptus anna
* †Physalidopisthia – tentative report
* †Picnotreta
** †Picnotreta lophocracenta
* †Pilekia – tentative report
* †Pinctus
* Pinna
** †Pinna innexpectans
* †Pinnatulites
* †Pinyonastraea
* †Piochella
** †Piochella peasleensis
* †Plagioglypta
* †Plagiura
** †Plagiura extensa
** †Plagiura minor
** †Plagiura retracta
* †Planoarchaediscus
* †Platuzona – or unidentified comparable form
* †Platybolbina
* Fossilized shell of the Silurian-Early Triassic sea snail Platyceras †Platyceras
** †Platyceras trojani – type locality for species
* †Platycrinites
* †Platycrinus – tentative report
* †Platyschisma
* †Platystrophia
* †Platyterorhynchus
** †Platyterorhynchus russelli
* †Platyworthenia
* †Platyzona
* †Plaxocrinus
** †Plaxocrinus piutae
* †Plectatrypa
** †Plectatrypa imbricata – or unidentified comparable form
* †Plectelasma
** †Plectelasma type locality for species A – informal
** †Plectelasma type locality for species B – informal
* †Plectodina
** †Plectodina florida
** †Plectodina tenuis
* †Plectogyra
** †Plectogyra irregularis
** †Plectogyra tumesepta
** †Plectogyra tumula
* †Plectorthis
** †Plectorthis obesa
** †Plectorthis perplexus
* †Plectotrophia – tentative report
* †Pleiopleurina
** †Pleiopleurina anticlastica
* †Plethopeltis
** †Plethopeltis arbucklensis – or unidentified comparable form
* †Plethoschisma
** †Plethoschisma grandis
* Fossil of the Late Ordovician cystoid echinoderm Pleurocystites †Pleurocystites
* †Pleurograptus
** †Pleurograptus lui
* †Pleurorima
** †Pleurorima hoffmannae – type locality for species
* †Pleurorthis
** †Pleurorthis beattyensis
* †Pleurosiphonella
* †Plicatolina
* †Plicocyathus
** †Plicocyathus rozanovi
* †Plicoplasia
** †Plicoplasia cooperi
* †Pliomeroides
* †Pliomerops
** †Pliomerops canadensis – or unidentified comparable form
* †Plummericrinus
** †Plummericrinus bulbosus
** †Plummericrinus jelli
* †Polidevcia
** †Polidevcia arctura – type locality for species
** †Polidevcia bellistriata
** †Polidevcia obesa
* †Poliella
** †Poliella denticulata
** †Poliella germana
** †Poliella leipalox – type locality for species
** †Poliella leipolox
** †Poliella lomataspis
** †Poliella ovala
** †Poliella prima – or unidentified comparable form
* †Poliellaites
** †Poliellaites gloriosa
* †Politicurus – tentative report
** †Politicurus politus – or unidentified related form
* †Polusocrinus
** †Polusocrinus amplus
* †Polygnathus
** †Polygnathus abbessensis
** †Polygnathus angusticostatus
** †Polygnathus angustipennatus – or unidentified comparable form
** †Polygnathus bagialensis
** †Polygnathus benderi
** †Polygnathus bultyncki
** †Polygnathus costatus
** †Polygnathus damelei – type locality for species
** †Polygnathus eiflius
** †Polygnathus gronbergi
** †Polygnathus holynensis – type locality for species
** †Polygnathus linguiformis
** †Polygnathus parawebbi
** †Polygnathus pseudofoliatus
** †Polygnathus robertensis – type locality for species
** †Polygnathus salixensis – type locality for species
** †Polygnathus serotinus
* †Polyplucograptus
* †Polypora
** †Polypora keyserlingiformis – type locality for species
** †Polypora remota
** †Polypora sargaensis
* †Polyporella
** †Polyporella helgersonia – type locality for species
* †Polythalamia – type locality for genus
** †Polythalamia americana – type locality for species
* †Pontisia
** †Pontisia boodi
* †Porcellia
** †Porcellia denayi
* †Poronileus
** †Poronileus fistulosus
** †Poronileus vallancei
* †Porosublastus
** †Porosublastus inexpectus
* †Posidonia
** †Posidonia becheri
* †Poteriocrinites
** †Poteriocrinites permicus
* †Praedaraelites
** †Praedaraelites loeblichi
* †Praenatica
* †Praewaagenoconcha
* †Prasopora
* †Prehousia
** †Prehousia alata
** †Prehousia impolita
** †Prehousia indenta
** †Prehousia prima
** †Prehousia semicircularis
* †Presbynileus
** †Presbynileus ibexensis
* †Primaspis
* †Prioniodina – tentative report
* †Priscella
* †Proaulopora
* †Prodentalium
** †Prodentalium canna
* †Productella
* †Proehmaniella
** †Proehmaniella hebes – tentative report
* Restoration of the Silurian trilobite Proetus †Proetus
* †Profallotaspis – tentative report
* †Profusulinella
** †Profusulinella copiosa
** †Profusulinella decora
* †Prolecanites
** †Prolecanites lyoni
* †Promytilus
* †Proplina
** †Proplina propina – or unidentified comparable form
* †Protathyris
** †Protathyris hesperalis
* †Protocalymene
** †Protocalymene mcallesteri
* †Protochonetes
** †Protochonetes elyensis – type locality for species
* †Protocortezorthis
** †Protocortezorthis windmillensis – type locality for species
* †Protoentactinia
** †Protoentactinia gracilispinosa – type locality for species
** †Protoentactinia latospinosa – type locality for species
** †Protoentactinia minuta – type locality for species
* †Protopanderodus
** †Protopanderodus insculptus
* †Protopharetra
** †Protopharetra arcybata – type locality for species
** †Protopharetra junensis
* †Protopliomerops
* †Protopresbynileus
** †Protopresbynileus glaber – or unidentified comparable form
** †Protopresbynileus wildeni
* †Protospongia
** †Protospongia conica
** †Protospongia spina – type locality for species
* †Prototreta
* †Protowentzelella
** †Protowentzelella cystosa – type locality for species
** †Protowentzelella kunthi – type locality for species
** †Protowentzelella variabilis – type locality for species
* †Protozyga – tentative report
* †Psalikilus
** †Psalikilus pikum
* †Psephosthenaspis
** †Psephosthenaspis ellipsepyga
** †Psephosthenaspis glabrior
** †Psephosthenaspis pseudobathyurus
* †Pseudagnostus
** †Pseudagnostus communis
** †Pseudagnostus contracta – type locality for species
** †Pseudagnostus josephus
* †Pseudedriophus
** †Pseudedriophus guensburgi
* †Pseudoammodiscus
* †Pseudoatrypa – tentative report
** †Pseudoatrypa percrassa
* †Pseudobatostomella
** †Pseudobatostomella irregularis – type locality for species
* †Pseudobelodina
** †Pseudobelodina inclinata
** †Pseudobelodina kinki
** †Pseudobelodina vulgaris
* †Pseudocybele
** †Pseudocybele altinasuta
** †Pseudocybele lemurei
** †Pseudocybele nasuta
* †Pseudocystophora
** †Pseudocystophora complexa
* †Pseudoendothyra
* †Pseudofusulinella
** †Pseudofusulinella dunbari
** †Pseudofusulinella jeffordsi – type locality for species
** †Pseudofusulinella pusilla – type locality for species
** †Pseudofusulinella rotunda
* †Pseudohystricurus
* †Pseudokingstonia
** †Pseudokingstonia exotica
* †Pseudomera
** †Pseudomera arachnopyge
** †Pseudomera barrandei
* †Pseudomonotis
* †Pseudoneotodus
** †Pseudoneotodus beckmanni
** †Pseudoneotodus mitratus
* †Pseudoolenoides
** †Pseudoolenoides acicaudus
** †Pseudoolenoides dilectus – or unidentified comparable form
* †Pseudooneotodus
** †Pseudooneotodus mitratus
* †Pseudoparazyga
** †Pseudoparazyga cooperi
* †Pseudoreichelina
* †Pseudorthoceras
* †Pseudosaratogia
** †Pseudosaratogia abnormis
** †Pseudosaratogia leptogranulata
* †Pseudostaffella
** †Pseudostaffella needhami
* †Pseudosyrinx
** †Pseudosyrinx desiderata
* †Pseudotaxis
* †Pseudovermiporella
* †Pseudozaphrentoides
** †Pseudozaphrentoides hanseni
** †Pseudozaphrentoides trojana – type locality for species
* †Pseudozygopleura
* †Ptarmiganoides
** †Ptarmiganoides araneicauda – type locality for species
** †Ptarmiganoides crassaxis
** †Ptarmiganoides hexacantha
** †Ptarmiganoides lepida – tentative report
** †Ptarmiganoides propinqua
* †Pterinopecten
** †Pterinopecten spio
* †Pterocephalia
** †Pterocephalia concava
** †Pterocephalia elongata
** †Pterocephalia punctata
** †Pterocephalia sanctisabae
* Fossil of the Cambrian trilobite Ptychagnostus †Ptychagnostus
** †Ptychagnostus atavus
** †Ptychagnostus intermedius
** †Ptychagnostus seminula
* †Ptychomphalina
** †Ptychomphalina type locality for species – informal
* †Ptychophyllum – tentative report
* †Ptychopleurella
* †Ptychopleurites
** †Ptychopleurites bevifrons – or unidentified comparable form
* †Ptyocephalus
** †Ptyocephalus accliva
** †Ptyocephalus vigilans
* †Pugilator
** †Pugilator deckeri
* †Punctaparchites
* †Punctospirifer
** †Punctospirifer gnomus – type locality for species
** †Punctospirifer kentuckensis
** †Punctospirifer kentuekyensis
* †Punka
** †Punka caecata
* †Pycnostylus

## Q

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Quadratia
** †Quadratia hirsutiformis
* †Quadratonucula
** †Quadratonucula stella – type locality for species
* †Quadricarina
** †Quadricarina glabrobasis
** †Quadricarina type locality for species A. – informal
* †Quadrithyris
** †Quadrithyris minuens – or unidentified comparable form
** †Quadrithyris vijaicus – or unidentified comparable form
* †Quadrochonetes
** †Quadrochonetes type locality for species A – informal
* †Quasimodaspis
** †Quasimodaspis brentsae

## R

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Radiastraea
** †Radiastraea arachne
** †Radiastraea nevadensis
* †Radiastrea
* †Radiatrypa
** †Radiatrypa advena
** †Radiatrypa klukasi
* †Rafinesquina
* †Raphistoma
** †Raphistoma gubanovi
* †Raymondaspis
** †Raymondaspis vespertina
* †Raymondella
** †Raymondella nevadensis
* †Raymondensis – tentative report
* †Raymondites – tentative report
* †Rayonnoceras
* Fossil of the Early Ordovician-Permian benthic alga Receptaculites †Receptaculites
* †Rectifenestella
** †Rectifenestella cordiretiformis – type locality for species
** †Rectifenestella tenax
* †Rectograptus
** †Rectograptus abbreviatus
* †Remopleurides
** †Remopleurides similus – or unidentified comparable form
** †Remopleurides simulus – or unidentified comparable form
* †Renalcis
* †Rensselaeria
* †Rensselaerina
* †Rensselandia
** †Rensselandia cloudi – type locality for species
* †Repinaella
* †Resserella
* †Reteporidra
** †Reteporidra anaphora
* †Reticulariina
* †Reticularina
** †Reticularina campestris
** †Reticularina spinosa
* †Reticulariopsis
* †Retilamina
** †Retilamina debrennei
* †Retispira
** †Retispira albapinensis
** †Retispira nolani – type locality for species
* †Rhabdiferoceras – type locality for genus
** †Rhabdiferoceras annuliferum – type locality for species
* †Rhabdocyclus
** †Rhabdocyclus depressus
* †Rhabdomeson
* †Rhipidomella
** †Rhipidomella carbonaria
** †Rhipidomella elyensis
** †Rhipidomella nevadensis
* †Rhipidothyris
** †Rhipidothyris circo – type locality for species
* †Rhizophyllum
** †Rhizophyllum inornatum
* †Rhombifera
* †Rhombopora
** †Rhombopora cornwallis
* †Rhombotrypella
** †Rhombotrypella regularis
** †Rhombotrypella sunfloweria
* †Rhynchocamara
** †Rhynchocamara breviplicata – or unidentified comparable form
** †Rhynchocamara sublaevis
* †Rhynchopora
** †Rhynchopora taylori
* †Rhynchospirina
* †Rhynoleichus
** †Rhynoleichus weeksi
* †Rhysostrophia
** †Rhysostrophia nevadensis
** †Rhysostrophia occidentalis
* †Rhyssochonetes
** †Rhyssochonetes solox
* †Rimmyjimina
* †Rioceras – tentative report
* †Robergia
* †Robergiella
* †Rossaspis
* †Rossoceras
* †Rossodus – tentative report
** †Rossodus tenuis
* †Rostranteris
** †Rostranteris type locality for species A – informal
* †Rotopericyclus
** †Rotopericyclus pinyonensis – type locality for species
* †Roundya
* †Rousseauspira
** †Rousseauspira teicherti
* †Ruedemannoceras
* †Rugatia
** †Rugatia occidentalis – or unidentified comparable form
* †Rugocoelia – type locality for genus
** †Rugocoelia eganensis – type locality for species
* †Rugosochonetes

## S

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Sabellidites
** †Sabellidites canadiensis
* †Saffordophyllum
* †Sagittodontus
** †Sagittodontus robustus – tentative report
* †Sallya
* †Salopina
* Illustration of fossilized shells of the mysterious Cambrian organism Salterella †Salterella
* †Sandolasma
** †Sandolasma buttense – type locality for species
** †Sandolasma elegans
** †Sandolasma hillae – type locality for species
** †Sandolasma perplexa – type locality for species
* †Sanguinolites
** †Sanguinolites salteri
* †Sansabella – tentative report
* †Scabbardella
** †Scabbardella altipes
* †Scandodus
** †Scandodus unicostatus
* †Scaphorthis
* †Sceptropora
** †Sceptropora faculum
* †Schedexocrinus
* †Schistometopus
* †Schizambon
* †Schizodus
** †Schizodus curtiformis
** †Schizodus semistriatus – or unidentified comparable form
* †Schizophoria
** †Schizophoria depressa
** †Schizophoria fascicostella – or unidentified comparable form
** †Schizophoria mcfarlanei
** †Schizophoria nevadaensis
** †Schizophoria parafragilis – type locality for species
** †Schizophoria simpsoni
** †Schizophoria texana
* †Schizoporia
** †Schizoporia resupinoides
** †Schizoporia texana
* †Schmidtella
* †Schmidtites – tentative report
* †Schubertella
** †Schubertella kingi
* †Schuchertella
* †Schwagerina
** †Schwagerina jeffordsi – type locality for species
** †Schwagerina munda – type locality for species
** †Schwagerina rotunda
* †Scinocephalus
** †Scinocephalus solitecti – or unidentified related form
* †Sciophyllum
* †Scolopodus
** †Scolopodus insculptus
* †Scotiaecystis – tentative report
* †Scotoharpes
* †Secuicollacta
** †Secuicollacta stelligera – type locality for species
* †Selenimyalina
* †Semizona
** †Semizona glindmeyeri
* †Septabrunsiina
* †Septaglomospiranella
* †Septatrypa
* †Septimyalina
** †Septimyalina burmai
* †Septopora
** †Septopora alternata
** †Septopora bilateralis
* †Serpulospira
** †Serpulospira annulatus – or unidentified comparable form
** †Serpulospira swickae
* †Severella
* †Shamovella
* †Shastalasma
** †Shastalasma woodi – type locality for species
* †Shoshonorthis
** †Shoshonorthis swanensis – or unidentified comparable form
* †Shumardia
** †Shumardia exopthalmus
* †Siderocyathus – type locality for genus
** †Siderocyathus duncanae – type locality for species
* †Sieberella
** †Sieberella problematica – or unidentified comparable form
** †Sieberella pyriforma – type locality for species
* †Sigmocheilus
** †Sigmocheilus flabellifer
** †Sigmocheilus grata
** †Sigmocheilus notha
** †Sigmocheilus pogonipensis
* †Simulolenus
** †Simulolenus granulatus
** †Simulolenus quadrisulcatus
* †Sinotubuites
** †Sinotubuites cienegensis
* †Sinuites
* Fossil of the Carboniferous colonial rugose coral Siphonodendron †Siphonodendron
** †Siphonodendron sinousum – or unidentified comparable form
** †Siphonodendron sinuosum – or unidentified comparable form
** †Siphonodendron whitneyi – or unidentified comparable form
* †Siphonodendrum
** †Siphonodendrum sinuosum – or unidentified comparable form
* †Sivorthis
** †Sivorthis eucharis
** †Sivorthis occidentalis
* †Skenidioides
** †Skenidioides oklahomensis
* †Skenidium
** †Skenidium asellatum – or unidentified comparable form
* †Skippella
* †Soleniscus
* †Sowerbyella
** †Sowerbyella merriami
** †Sowerbyella perplexa – or unidentified comparable form
* †Sowerbyites
* †Spathognathodus
** †Spathognathodus minutus – or unidentified comparable form
* †Spencia
** †Spencia quadrata – type locality for species
* †Sphaerirhynchia
* Assemblage of fossils of the Ordovician-Triassic blue-green alga Sphaerocodium †Sphaerocodium
* †Sphaerocoryphe
* †Sphenosteges
** †Sphenosteges hispidus
* †Sphenothallus
* †Sphenotreta
** †Sphenotreta sulcata – or unidentified comparable form
* †Spinatrypa
** †Spinatrypa aspera – or unidentified comparable form
** †Spinatrypa soetenica – or unidentified comparable form
* †Spinatrypina
** †Spinatrypina angusticostata
** †Spinatrypina comitata – or unidentified comparable form
** †Spinatrypina lamellosa
** †Spinatrypina recula – type locality for species
* †Spinella
** †Spinella talenti – type locality for species
* †Spinoplasia
** †Spinoplasia roeni – type locality for species
* †Spinulicosta
** †Spinulicosta muirwoodi
* Fossilized shell of the Late Ordovician-Late Triassic brachiopod Spirifer †Spirifer
** †Spirifer arkansanus – or unidentified comparable form
** †Spirifer centronatus
** †Spirifer haydenianus – or unidentified related form
** †Spirifer occidus
** †Spirifer opimus
** †Spirifer pellaensis – tentative report
** †Spirifer rockymontanus
* †Spiriferella
** †Spiriferella scobina – type locality for species
* †Spiriferellina
** †Spiriferellina campestris
** †Spiriferellina ceres
** †Spiriferellina lata
* †Spiriferina
* †Spirigerina
** †Spirigerina supramarginalis
* †Spirinella
** †Spirinella pauciplicata
* †Spirocyathella – tentative report
** †Spirocyathella microporosa – type locality for species
* †Spirodentalium
** †Spirodentalium walcotti – type locality for species
* Modern shells of the polychaete worm Spirorbis Spirorbis
* †Spongophyllum
* †Spygoria – type locality for genus
** †Spygoria zappania – type locality for species
* †Squamaria
* †Squameofavosites
* †Stachyodes
* †Staffella
** †Staffella expansa
* †Staufferella
* †Stauromatidium
* †Stegnopsis
* †Stegocoelia
* †Stelechophyllum – tentative report
* †Stellahexaformis – type locality for genus
** †Stellahexaformis gersterensis – type locality for species
* †Stellarocrinus
** †Stellarocrinus comptus
** †Stellarocrinus cuneatus
* †Stenambon
** †Stenambon megagranulus
** †Stenambon paucigranulus
* †Stenodiscus
** †Stenodiscus murdockensis – type locality for species
* †Stenoglaphyrites
** †Stenoglaphyrites hesperius
** †Stenoglaphyrites merriami
* †Stenoloron
** †Stenoloron minor
* †Stenopecrinus – tentative report
** †Stenopecrinus xerophilus
* †Stenopora
** †Stenopora parvaexozona – type locality for species
* †Stenothecoides
* †Stephenaspis
** †Stephenaspis avitus – type locality for species
** †Stephenaspis highlandensis
* †Stereodictyum
** †Stereodictyum proteron – type locality for species
* †Stereolasma
* †Stereostylus
** †Stereostylus compressum
* †Stibaraster
* †Stictoporella
* Fossil preserved in situ of a Carboniferous tree-like club moss relative with attached Stigmaria rhizome system †Stigmaria
** †Stigmaria wedingtonensis
* †Strachanognathus
** †Strachanognathus parvus
* †Straparollus
** †Straparollus caementarius
** †Straparollus lonemountainensis
** †Straparollus spergenensis – or unidentified related form
* †Streblochondria
* †Streblopteria
** †Streblopteria similis
* †Streblotrypa
** †Streblotrypa elongata – type locality for species
* †Streptacis
* †Streptelasma
** †Streptelasma prolongatum
* †Streptognathodus
** †Streptognathodus unicornis
* †Streptorhynchus
* †Streptosolen
** †Streptosolen mccafferyi – type locality for species
** †Streptosolen nodosus – type locality for species
** †Streptosolen occidentalis
* †Strianematina
* †Striatifera
* †Striatopora
* †Strigambitus
** †Strigambitus bilobus
** †Strigambitus transversus
** †Strigambitus utahensis
* †Strigigenalis
* †Stringocephalus
** †Stringocephalus nevadensis – type locality for species
* †Strobeus
* †Stromatopora
* †Strombodes
* †Stropheodonta
** †Stropheodonta filicosta
** †Stropheodonta magnacosta – type locality for species
* †Stropheodontida
* †Strophochonetes
* Fossilized shell of the Ordovician-Silurian brachiopod Strophomena †Strophomena
* †Strophonella
** †Strophonella bohemica – or unidentified comparable form
** †Strophonella punctulifera – or unidentified comparable form
* †Strophostylus
** †Strophostylus nevadensis – type locality for species
** †Strophostylus tantillus – type locality for species
* †Stuartwellercrinus
** †Stuartwellercrinus corbatoi
* †Stummelasma
** †Stummelasma antelopense
** †Stummelasma lonense
** †Stummelasma sulfurense – type locality for species
* †Stygina – tentative report
* †Styliolina
* †Stylonema – tentative report
* †Stylopleura
** †Stylopleura berthiaumi
** †Stylopleura nevadensis
* †Styracograptus
** †Styracograptus mississippiensis
** †Styracograptus tatianae
* †Subrensselandia
** †Subrensselandia nolani
* †Subrensselendia
* †Subretepora
* †Subulites
* †Sulcoretepora
** †Sulcoretepora corticata
** †Sulcoretepora irregularis
* †Sychnoelasma
** †Sychnoelasma alrichanum – or unidentified comparable form
** †Sychnoelasma ulrichanum – or unidentified comparable form
* †Symphysurina
** †Symphysurina walcotti
* †Synarmocrinus
** †Synarmocrinus brachiatus – type locality for species
* †Syndielasma
** †Syndielasma biseptatum
* †Syngastrioceras
* †Synprioniodina – tentative report
* †Syntrophina – tentative report
* †Syntrophopsis
** †Syntrophopsis polita
* †Synyphocrinus
** †Synyphocrinus permicus
* †Syringaxon
* Fossil of the Devonian tabulate coral Syringopora †Syringopora
** †Syringopora surcularia
* †Syringostroma
* †Syspacephalus
** †Syspacephalus crassus
** †Syspacephalus laticeps – or unidentified comparable form
** †Syspacephalus longus
** †Syspacephalus uncus – tentative report
** †Syspacephalus variosus – type locality for species

## T

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Tabulipora
** †Tabulipora carbonaria – type locality for species
** †Tabulipora hispida
* †Tabulophyllum
* †Taenora
** †Taenora expansa
* †Tancrediopsis
** †Tancrediopsis cuneata – or unidentified related form
* †Taphrodonta
** †Taphrodonta parallela
* †Tapinotomaria
* †Tecnocyrtina
** †Tecnocyrtina fissiplicata
** †Tecnocyrtina missouriensis
* †Tegerocyathus
** †Tegerocyathus edelsteini
* †Teichertina
** †Teichertina americana – type locality for species
** †Teichertina fitzroyensis
* †Teiichispira
** †Teiichispira auricula – type locality for species
* †Telephina
* †Temnocheilus
* †Temnophyllum
** †Temnophyllum waltheri – type locality for species
* †Tentaculites
* Fossils of the Early-Late Ordovician graptolite Tetragraptus †Tetragraptus
** †Tetragraptus bigsbyi
* †Tetraprioniodus – tentative report
** †Tetraprioniodus costatus
* †Tetrataxis
** †Tetrataxis angusta
* †Texacrinus
** †Texacrinus distortus
* †Thamniscus
** †Thamniscus erraticus – type locality for species
* †Thamnopora
** †Thamnopora limitaris
* †Thamnosia
** †Thamnosia depressa
* Fossil of the Cambrian trilobite Thoracocare †Thoracocare
** †Thoracocare idahoensis
* †Tikhinella
* †Timaniella
** †Timaniella pseudocamerata – or unidentified comparable form
* †Timanodictya
** †Timanodictya dichotoma – or unidentified comparable form
* †Toernquistia – tentative report
* †Tonkinaria
** †Tonkinaria simpsoni
* †Tonkinella
** †Tonkinella breviceps
** †Tonkinella valida
* †Tonopahella – type locality for genus
** †Tonopahella goldfieldensis – type locality for species
* †Toquimaella
** †Toquimaella kayi – type locality for species
* †Toquimaphyllum
** †Toquimaphyllum johnsoni
** †Toquimaphyllum sentum – type locality for species
** †Toquimaphyllum vulgare – type locality for species
* †Toquimia
** †Toquimia kirki
* †Tortodus
** †Tortodus australis
** †Tortodus kockelianus
* †Torynifer
** †Torynifer internascens – or unidentified comparable form
* †Totiglobus – type locality for genus
** †Totiglobus nimius – type locality for species
* †Trachycheilus
** †Trachycheilus whirlwindensis
* †Trachydomia
* †Trachyspira
* †Trampidocrinus
** †Trampidocrinus bellicus
** †Trampidocrinus phiola
* †Trematopora
* †Trematorthis
** †Trematorthis tenuis
* †Trematospira
** †Trematospira perforata
* †Trepospira
* Restoration showing the top (left) and underside of the Late Ordovician trilobite Triarthrus †Triarthrus
* †Trichonodella
** †Trichonodella barbara – or unidentified comparable form
* †Trigonirhynchia
** †Trigonirhynchia occidens
* †Trigonocerca
** †Trigonocerca typica
* †Trigrammaria
* †Trinodus
* †Tritoechia
** †Tritoechia sinuata
* †Trocholites
* †Trochonema – tentative report
* †Tropidodiscus
* †Trupetostroma
* †Tryplasma
** †Tryplasma duncanae
** †Tryplasma radicula
* †Tschussovskenia
** †Tschussovskenia connorsensis – type locality for species
** †Tschussovskenia dilata
* †Tuberitina
* †Tumicephalus
** †Tumicephalus depressus
* †Turbonitella
** †Turbonitella biserialis – or unidentified related form
* Fossilized shell of the Cambrian arthropod Tuzoia †Tuzoia
* †Tyersella
* †Tylonautilus
* †Tylothyris
* †Tympanuella
** †Tympanuella transversa

## U

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Ufimia
* †Undispirifer
* †Uraloceras
** †Uraloceras burtiense
** †Uraloceras involutum
** †Uraloceras nevadense – type locality for species
* †Uromystrum
** †Uromystrum validum – or unidentified comparable form
* †Ursinella – type locality for genus
** †Ursinella major – type locality for species
* †Utharocrinus

## V

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Vagrania
** †Vagrania gronbergi
* †Valcourea
** †Valcourea intracarinata
** †Valcourea plana
** †Valcourea transversa
* †Vallomyonia
** †Vallomyonia claudiae
** †Vallomyonia devonica
* †Varatrypa
* †Vargania
** †Vargania gronbergi
* †Variatrypa
** †Variatrypa exoleta
** †Variatrypa licta – type locality for species
* †Varvia – tentative report
* †Verpaspongia – type locality for genus
** †Verpaspongia nodosa – type locality for species
* †Verticillopora
* †Vesiculophyllum
* †Vesperispira – type locality for genus
** †Vesperispira humboldtiana – type locality for species
* †Vidronovella
** †Vidronovella fastigiata
* †Virgiana
** †Virgiana utahensis – type locality for species
* †Volocephalina
** †Volocephalina connexa
** †Volocephalina variosa – type locality for species
* †Volocphalina
** †Volocphalina variosa – type locality for species

## W

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Waagenella
** †Waagenella vespertinus – type locality for species
* †Waagenites
** †Waagenites type locality for species A – informal
** †Waagenites type locality for species B – informal
* †Waagenoconcha – tentative report
* †Walliserodus
** †Walliserodus amplissimus
** †Walliserodus curvatus
* Fossil of the Cambrian trilobite Wanneria †Wanneria
** †Wanneria walcottana – or unidentified comparable form
* †Warburgella
** †Warburgella rugulosa
* †Warrenella
** †Warrenella franklinii
** †Warrenella kirki
** †Warrenella nevadensis
** †Warrenella occidentalis
** †Warrenella plicata
** †Warrenella praekirki
* †Watsonella
* †Weirchellatia
* †Wellerella
** †Wellerella delicatula – or unidentified comparable form
** †Wellerella osagensis
** †Wellerella truncata
* †Wendoverella – type locality for genus
** †Wendoverella arca – type locality for species
* †Wenkchemnia
** †Wenkchemnia sulcata
** †Wenkchemnia walcotti
* †Westergaardites
* †Westmontia
** †Westmontia devilensis
* †Weyerides – tentative report
* †Whittingtonia – tentative report
* †Wilberrya
** †Wilberrya fragilis
* †Williamicyathus
* †Wilsonastraea
** †Wilsonastraea fraseri – type locality for species
** †Wilsonastraea parva – type locality for species
** †Wilsonastraea smithi
* †Wimanella – tentative report
* †Winchellatia
* †Wjatkella
** †Wjatkella hemiseptifera – type locality for species
** †Wjatkella permiana
* †Worthenia
** †Worthenia corrugata
* †Wujiajiania
** †Wujiajiania sutherlandi
* †Wutinoceras
** †Wutinoceras huygenae – or unidentified comparable form

## X

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Xenelasma – tentative report
* †Xenocheilos
** †Xenocheilos granulosus
* †Xenostegium
** †Xenostegium franklinense – or unidentified comparable form
* †Xestotrema
** †Xestotrema pulchrum – type locality for species
* †Xystocrania
** †Xystocrania perforator
** †Xystocrania pyriformis – type locality for species

## Y

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Yakovlevia
** †Yakovlevia multistriata – type locality for species
* †Yinograptus
** †Yinograptus disjunctus
* †Yochelsonospira
** †Yochelsonospira tenuilineata
* Yoldia
* †Youngia – tentative report
* †Yuknessaspis
** †Yuknessaspis benningtonis
* †Yunnania

## Z

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Zacanthoides
** †Zacanthoides alatus – or unidentified comparable form
** †Zacanthoides demissus
** †Zacanthoides divergensis
** †Zacanthoides variacantha
** †Zacanthoides walapai
* †Zacanthopsina – type locality for genus
** †Zacanthopsina eperephes – type locality for species
* †Zacanthopsis
** †Zacanthopsis contractus – type locality for species
** †Zacanthopsis levis
* †Zelophyllum – tentative report
* †Zonophyllum
** †Zonophyllum lonense
** †Zonophyllum robertsense
* †Zygognathus
* †Zygospira