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Pioche Shale, Nevada, USA

FormationPioche Shale
Member(s)A Shale
C-Shale
Combined Metals
Comet Shale
Grassy Spring
Log Cabin
Log Cabin Shale
Lower
Susan Duster Limestone
Upper
Age:513 - 501 Ma
Cambrian
IntervalDelamaran
Lithologyshale, sandstone, "limestone"
Number of Collections5
Number of Occurrences15

Recorded Sample Locations

LocationRegionStratigraphic Name
41214Lincoln County, Nevada, USAPioche Shale - Comet Shale
41217Lincoln County, Nevada, USAPioche Shale - Comet Shale
41218Lincoln County, Nevada, USAPioche Shale - Comet Shale
41429Lincoln County, Nevada, USAPioche Shale - Comet Shale
41433Lincoln County, Nevada, USAPioche Shale - Comet Shale
41436Lincoln County, Nevada, USAPioche Shale - Comet Shale
41442Lincoln County, Nevada, USAPioche Shale - Comet Shale
41443Lincoln County, Nevada, USAPioche Shale - Comet Shale
41447Lincoln County, Nevada, USAPioche Shale - Comet Shale
41449Lincoln County, Nevada, USAPioche Shale - Comet Shale
Col. 41144Lincoln County, Nevada, USAPioche Shale - Grassy Spring
Collection 41172Lincoln County, Nevada, USAPioche Shale - Grassy Spring
Collection 41174Lincoln County, Nevada, USAPioche Shale - Grassy Spring
Collection 41175Lincoln County, Nevada, USAPioche Shale - Grassy Spring
Collection 41187Lincoln County, Nevada, USAPioche Shale - Grassy Spring
Collection 41170 [Grassy Spring MbrLincoln County, Nevada, USAPioche Shale - Grassy Spring
Collection 41150Lincoln County, Nevada, USAPioche Shale - Grassy Spring
Collection 41191Lincoln County, Nevada, USAPioche Shale - Grassy Spring
Collection 41205Lincoln County, Nevada, USAPioche Shale - Grassy Spring
Collection 41156Lincoln County, Nevada, USAPioche Shale - Grassy Spring
Collection 41158Lincoln County, Nevada, USAPioche Shale - Grassy Spring
Collection 41207Lincoln County, Nevada, USAPioche Shale - Grassy Spring
Collection 41200Lincoln County, Nevada, USAPioche Shale - Grassy Spring
Collection 41203Lincoln County, Nevada, USAPioche Shale - Grassy Spring
Collection 41152Lincoln County, Nevada, USAPioche Shale - Grassy Spring
Collection 41153Lincoln County, Nevada, USAPioche Shale - Grassy Spring
Near Las VegasStorey County, Nevada, USAPioche Shale
Unit 5Clark County, Nevada, USAPioche Shale
Locality ICS-1044Lincoln County, Nevada, USAPioche Shale - C-Shale
Locality ICS-1173Lincoln County, Nevada, USAPioche Shale - C-Shale
Lithology 1Lincoln County, Nevada, USAPioche Shale - Combined Metals
1400-COLincoln County, Nevada, USAPioche Shale - Combined Metals
41211Lincoln County, Nevada, USAPioche Shale - Comet Shale
41800Lincoln County, Nevada, USAPioche Shale - Combined Metals
USNM 41750Lincoln County, Nevada, USAPioche Shale - Susan Duster Limestone
USNM 41738Lincoln County, Nevada, USAPioche Shale - Log Cabin
USNM 41765Lincoln County, Nevada, USAPioche Shale - Log Cabin
USNM 41784Lincoln County, Nevada, USAPioche Shale - Susan Duster Limestone
USNM 31aLincoln County, Nevada, USAPioche Shale - Log Cabin
USNM 41767Lincoln County, Nevada, USAPioche Shale - Susan Duster Limestone
USNM 41768Lincoln County, Nevada, USAPioche Shale - Susan Duster Limestone
USNM 41132Lincoln County, Nevada, USAPioche Shale - Log Cabin
USNM 41924Lincoln County, Nevada, USAPioche Shale - Susan Duster Limestone
USNM 41745Lincoln County, Nevada, USAPioche Shale - Log Cabin Shale
USNM 41740Lincoln County, Nevada, USAPioche Shale - Log Cabin Shale
USNM 41927Lincoln County, Nevada, USAPioche Shale - Log Cabin Shale
USNM 41752Lincoln County, Nevada, USAPioche Shale - Susan Duster Limestone
USNM 41754Lincoln County, Nevada, USAPioche Shale - Log Cabin Shale
Meekoceras zone of Phelan RanchWhite Pine County, Nevada, USAPioche Shale - Upper

Associated Units

Stratigraphic NameAgeLithologyOccurrence Records
Nopah - Dunderberg Shale501 - 485 Ma
Cambrian
wackestone, siltstone/"limestone"52
Pioche513 - 505 Ma
Cambrian
shale, sandstone/"shale"17
Pioche Shale - C-Shale513 - 505 Ma
Cambrian
shale, "limestone"44
Pioche Shale - Combined Metals513 - 505 Ma
Cambrian
limestone, "shale"/"limestone"19
Pioche Shale - Comet Shale513 - 501 Ma
Cambrian
limestone, "shale"51
Pioche Shale - Grassy Spring513 - 501 Ma
Cambrian
shale/"limestone", packstone, grainstone247
Pioche Shale - Log Cabin513 - 501 Ma
Cambrian
limestone/mudstone, "limestone", mudstone85
Pioche Shale - Log Cabin Shale513 - 501 Ma
Cambrian
mudstone, "limestone"/mudstone57
Pioche Shale - Lower516 - 513 Ma
Cambrian
limestone, siltstone/"limestone"16
Pioche Shale - Susan Duster Limestone513 - 501 Ma
Cambrian
limestone, "limestone"/"shale"94
Pioche Shale - Upper513 - 505 Ma
Cambrian
shale/"limestone", "limestone", "limestone"/"shale"117

Recorded Fossils

Accepted NameHierarchyAge
Annelida
phylum
2Animalia : Annelida516 - 513 Ma
Cambrian
Tuzoia sp.
genus
6Animalia : Arthropoda : Malacostraca : Tuzoia513 - 501 Ma
Cambrian
Canadaspis sp.
genus
6Animalia : Arthropoda : Canadaspidida : Canadaspididae : Canadaspis513 - 501 Ma
Cambrian
Perspicaris sp.
genus
6Animalia : Arthropoda : Canadaspidida : Perspicaris513 - 501 Ma
Cambrian
Anomalocarididae
family
5Animalia : Arthropoda : Radiodonta : Anomalocarididae513 - 501 Ma
Cambrian
Anomalocaris sp.
genus
6Animalia : Arthropoda : Anomalocarididae : Anomalocaris516 - 513 Ma
Cambrian
Trilobita
class
3Animalia : Arthropoda : Trilobita513 - 505 Ma
Cambrian
Alokistocare alta
species
7Animalia : Arthropoda : Trilobita : Ptychopariida : Alokistocaridae : Alokistocare : Alokistocare alta513 - 505 Ma
Cambrian
Amecephalus sp.
genus
6Animalia : Arthropoda : Trilobita : Ptychopariida : Alokistocaridae : Amecephalus513 - 501 Ma
Cambrian
Bythicheilus sp.
genus
6Animalia : Arthropoda : Trilobita : Ptychopariida : Alokistocaridae : Bythicheilus513 - 505 Ma
Cambrian
Chancia sp.
genus
6Animalia : Arthropoda : Trilobita : Ptychopariida : Alokistocaridae : Chancia513 - 505 Ma
Cambrian
Kistocare campbellensis
species
7Animalia : Arthropoda : Trilobita : Ptychopariida : Alokistocaridae : Kistocare : Kistocare campbellensis513 - 505 Ma
Cambrian
Corynexochida
order
4Animalia : Arthropoda : Trilobita : Corynexochida513 - 501 Ma
Cambrian
Athabaskia sp.
genus
6Animalia : Arthropoda : Trilobita : Corynexochida : Dolichometopidae : Athabaskia513 - 505 Ma
Cambrian
Bathyuriscus (Poliella) primus
species
7Animalia : Arthropoda : Trilobita : Corynexochida : Dolichometopidae : Poliella : Bathyuriscus (Poliella) primus513 - 501 Ma
Cambrian
Bathyuriscus petalus
species
7Animalia : Arthropoda : Trilobita : Corynexochida : Dorypygidae : Bathyuriscus : Bathyuriscus petalus513 - 505 Ma
Cambrian
Corynexochides prolatus
species
7Animalia : Arthropoda : Trilobita : Corynexochida : Dolichometopidae : Corynexochides : Corynexochides prolatus513 - 505 Ma
Cambrian
Glossopleura sp.
genus
6Animalia : Arthropoda : Trilobita : Corynexochida : Dolichometopidae : Glossopleura513 - 505 Ma
Cambrian
Poliella sp.
genus
6Animalia : Arthropoda : Trilobita : Corynexochida : Dolichometopidae : Poliella513 - 501 Ma
Cambrian
Poliella leipalox
species
7Animalia : Arthropoda : Trilobita : Corynexochida : Dolichometopidae : Poliella : Poliella leipalox513 - 505 Ma
Cambrian
Poliellaites sp.
genus
6Animalia : Arthropoda : Trilobita : Corynexochida : Dolichometopidae : Poliellaites513 - 501 Ma
Cambrian
Bonnia copia
species
7Animalia : Arthropoda : Trilobita : Corynexochida : Dorypygidae : Bonnia : Bonnia copia516 - 513 Ma
Cambrian
Dorypygidae
family
5Animalia : Arthropoda : Trilobita : Corynexochida : Dorypygidae513 - 501 Ma
Cambrian
Kootenia sp.
genus
6Animalia : Arthropoda : Trilobita : Corynexochida : Dorypygidae : Kootenia513 - 501 Ma
Cambrian
Kootenia aculacauda
species
7Animalia : Arthropoda : Trilobita : Corynexochida : Dinesidae : Kootenia : Kootenia aculacauda513 - 505 Ma
Cambrian
Kootenia crassa
species
7Animalia : Arthropoda : Trilobita : Corynexochida : Dinesidae : Kootenia : Kootenia crassa513 - 505 Ma
Cambrian
Kootenia crassinucha
species
7Animalia : Arthropoda : Trilobita : Corynexochida : Dinesidae : Kootenia : Kootenia crassinucha513 - 501 Ma
Cambrian
Ogygopsis sp.
genus
6Animalia : Arthropoda : Trilobita : Corynexochida : Ogygopsidae : Ogygopsis513 - 505 Ma
Cambrian
Olenoides sp.
genus
6Animalia : Arthropoda : Trilobita : Corynexochida : Dorypygidae : Olenoides513 - 505 Ma
Cambrian
Olenoides steptoensis
species
7Animalia : Arthropoda : Trilobita : Corynexochida : Dorypygidae : Olenoides : Olenoides steptoensis513 - 505 Ma
Cambrian
Oryctocephalites sp.
genus
6Animalia : Arthropoda : Trilobita : Corynexochida : Oryctocephalidae : Oryctocephalites516 - 513 Ma
Cambrian
Oryctocephalus sp.
genus
6Animalia : Arthropoda : Trilobita : Corynexochida : Oryctocephalidae : Oryctocephalus513 - 501 Ma
Cambrian
Albertella sp.
genus
6Animalia : Arthropoda : Trilobita : Corynexochida : Zacanthoididae : Albertella513 - 505 Ma
Cambrian
Albertella eiloitys
species
7Animalia : Arthropoda : Trilobita : Corynexochida : Zacanthoididae : Albertella : Albertella eiloitys513 - 505 Ma
Cambrian
Albertella judithi
species
7Animalia : Arthropoda : Trilobita : Corynexochida : Zacanthoididae : Albertella : Albertella judithi513 - 505 Ma
Cambrian
Albertella lata
species
7Animalia : Arthropoda : Trilobita : Corynexochida : Zacanthoididae : Albertella : Albertella lata513 - 505 Ma
Cambrian
Albertellina sp.
genus
6Animalia : Arthropoda : Trilobita : Corynexochida : Zacanthoididae : Albertellina513 - 505 Ma
Cambrian
Albertelloides sp.
genus
6Animalia : Arthropoda : Trilobita : Corynexochida : Zacanthoididae : Albertelloides513 - 501 Ma
Cambrian
Albertelloides mischi
species
7Animalia : Arthropoda : Trilobita : Corynexochida : Zacanthoididae : Albertelloides : Albertelloides mischi513 - 505 Ma
Cambrian
Delamarella sp.
genus
6Animalia : Arthropoda : Trilobita : Corynexochida : Zacanthoididae : Delamarella513 - 505 Ma
Cambrian
Fieldaspis sp.
genus
6Animalia : Arthropoda : Trilobita : Corynexochida : Dinesidae : Fieldaspis513 - 501 Ma
Cambrian
Mexicaspis sp.
genus
6Animalia : Arthropoda : Trilobita : Corynexochida : Zacanthoididae : Mexicaspis513 - 501 Ma
Cambrian
Paralbertella sp.
genus
6Animalia : Arthropoda : Trilobita : Corynexochida : Zacanthoididae : Paralbertella513 - 501 Ma
Cambrian
Ptarmiganoides sp.
genus
6Animalia : Arthropoda : Trilobita : Corynexochida : Zacanthoididae : Ptarmiganoides513 - 505 Ma
Cambrian
Ptarmiganoides araneicauda
species
7Animalia : Arthropoda : Trilobita : Corynexochida : Zacanthoididae : Ptarmiganoides : Ptarmiganoides araneicauda513 - 505 Ma
Cambrian
Stephenaspis sp.
genus
6Animalia : Arthropoda : Trilobita : Corynexochida : Zacanthoididae : Stephenaspis513 - 501 Ma
Cambrian
Ursinella sp.
genus
6Animalia : Arthropoda : Trilobita : Corynexochida : Zacanthoididae : Ursinella513 - 501 Ma
Cambrian
Zacanthoides sp.
genus
6Animalia : Arthropoda : Trilobita : Corynexochida : Zacanthoididae : Zacanthoides513 - 501 Ma
Cambrian
Zacanthoides demissus
species
7Animalia : Arthropoda : Trilobita : Corynexochida : Zacanthoididae : Zacanthoides : Zacanthoides demissus513 - 505 Ma
Cambrian
Zacanthopsis sp.
genus
6Animalia : Arthropoda : Trilobita : Corynexochida : Zacanthoididae : Zacanthopsis516 - 513 Ma
Cambrian
Pagetia sp.
genus
6Animalia : Arthropoda : Trilobita : Agnostida : Eodiscidae : Pagetia513 - 505 Ma
Cambrian
? no name ?
100513 - 505 Ma
Cambrian
Pagetia clytia
species
7Animalia : Arthropoda : Trilobita : Agnostida : Eodiscidae : Pagetia : Pagetia clytia513 - 505 Ma
Cambrian
Pagetia mucrogena
species
7Animalia : Arthropoda : Trilobita : Agnostida : Eodiscidae : Pagetia : Pagetia mucrogena513 - 505 Ma
Cambrian
Pagetia resseri
species
7Animalia : Arthropoda : Trilobita : Agnostida : Eodiscidae : Pagetia : Pagetia resseri513 - 501 Ma
Cambrian
Antagmus arenosus
species
7Animalia : Arthropoda : Trilobita : Ptychopariida : Antagmidae : Antagmus : Antagmus arenosus516 - 513 Ma
Cambrian
Crassifimbra sp.
genus
6Animalia : Arthropoda : Trilobita : Ptychopariida : Antagmidae : Crassifimbra516 - 513 Ma
Cambrian
Onchocephalus palupus
species
7Animalia : Arthropoda : Trilobita : Ptychopariida : Antagmidae : Onchocephalus : Onchocephalus palupus516 - 513 Ma
Cambrian
Achlysopsis hemitora
species
7Animalia : Arthropoda : Trilobita : Ptychopariida : Ptychopariidae : Achlysopsis : Achlysopsis hemitora513 - 505 Ma
Cambrian
Achlysopsis liokata
species
7Animalia : Arthropoda : Trilobita : Ptychopariida : Ptychopariidae : Achlysopsis : Achlysopsis liokata513 - 505 Ma
Cambrian
Amecephalites sp.
genus
6Animalia : Arthropoda : Trilobita : Ptychopariida : Ptychopariidae : Amecephalites513 - 501 Ma
Cambrian
Caborcella sp.
genus
6Animalia : Arthropoda : Trilobita : Ptychopariida : Ptychopariidae : Caborcella513 - 501 Ma
Cambrian
Nyella clinolimbata
species
7Animalia : Arthropoda : Trilobita : Ptychopariida : Ptychopariidae : Palmerara : Nyella clinolimbata513 - 505 Ma
Cambrian
Eokochaspis sp.
genus
6Animalia : Arthropoda : Trilobita : Ptychopariida : Ptychopariidae : Eokochaspis516 - 513 Ma
Cambrian
Eokochaspis nodosa
species
7Animalia : Arthropoda : Trilobita : Ptychopariida : Ptychopariidae : Eokochaspis : Eokochaspis nodosa513 - 501 Ma
Cambrian
Eoptychoparia sp.
genus
6Animalia : Arthropoda : Trilobita : Ptychopariida : Ptychopariidae : Eoptychoparia513 - 505 Ma
Cambrian
Hadrocephalites sp.
genus
6Animalia : Arthropoda : Trilobita : Ptychopariida : Ptychopariidae : Hadrocephalites513 - 501 Ma
Cambrian
Kochaspis sp.
genus
6Animalia : Arthropoda : Trilobita : Ptychopariida : Crepicephalidae : Kochaspis513 - 501 Ma
Cambrian
Kochaspis liliana
species
7Animalia : Arthropoda : Trilobita : Ptychopariida : Kochaspis : Kochaspis liliana513 - 501 Ma
Cambrian
Kochiella sp.
genus
6Animalia : Arthropoda : Trilobita : Ptychopariida : Alokistocaridae : Kochiella513 - 501 Ma
Cambrian
Kochiella maxeyi
species
7Animalia : Arthropoda : Trilobita : Ptychopariida : Alokistocaridae : Kochiella : Kochiella maxeyi513 - 501 Ma
Cambrian
Kochina sp.
genus
6Animalia : Arthropoda : Trilobita : Ptychopariida : Alokistocaridae : Kochina513 - 501 Ma
Cambrian
Mexicella sp.
genus
6Animalia : Arthropoda : Trilobita : Ptychopariida : Ptychopariidae : Mexicella513 - 501 Ma
Cambrian
Mexicella mexicana
species
7Animalia : Arthropoda : Trilobita : Ptychopariida : Ptychopariidae : Mexicella : Mexicella mexicana513 - 505 Ma
Cambrian
Onchocephalites sp.
genus
6Animalia : Arthropoda : Trilobita : Ptychopariida : Ptychopariidae : Onchocephalites513 - 501 Ma
Cambrian
Pachyaspis sp.
genus
6Animalia : Arthropoda : Trilobita : Ptychopariida : Ptychopariidae : Pachyaspis513 - 501 Ma
Cambrian
Pachyaspis gallagari
species
7Animalia : Arthropoda : Trilobita : Ptychopariida : Ptychopariidae : Pachyaspis : Pachyaspis gallagari513 - 505 Ma
Cambrian
Pachyaspis longa
species
7Animalia : Arthropoda : Trilobita : Ptychopariida : Ptychopariidae : Pachyaspis : Pachyaspis longa513 - 505 Ma
Cambrian
Palmerara sp.
genus
6Animalia : Arthropoda : Trilobita : Ptychopariida : Ptychopariidae : Palmerara513 - 501 Ma
Cambrian
Palmerara granosa
species
7Animalia : Arthropoda : Trilobita : Ptychopariida : Ptychopariidae : Palmerara : Palmerara granosa513 - 501 Ma
Cambrian
Panacus sp.
genus
6Animalia : Arthropoda : Trilobita : Ptychopariida : Ptychopariidae : Panacus513 - 505 Ma
Cambrian
Parapoulsenia sp.
genus
6Animalia : Arthropoda : Trilobita : Ptychopariida : Ptychoparioidae : Parapoulsenia513 - 501 Ma
Cambrian
Plagiura sp.
genus
6Animalia : Arthropoda : Trilobita : Ptychopariida : Ptychopariidae : Plagiura513 - 501 Ma
Cambrian
Spencia quadrata
species
7Animalia : Arthropoda : Trilobita : Ptychopariida : Ptychopariidae : Spencia : Spencia quadrata513 - 505 Ma
Cambrian
Syspacephalus sp.
genus
6Animalia : Arthropoda : Trilobita : Ptychopariida : Ptychopariidae : Syspacephalus513 - 501 Ma
Cambrian
Volocephalina sp.
genus
6Animalia : Arthropoda : Trilobita : Ptychopariida : Ptychopariidae : Volocephalina513 - 505 Ma
Cambrian
Bolbolenellus sp.
genus
6Animalia : Arthropoda : Trilobita : Redlichiida : Olenellidae : Bolbolenellus516 - 513 Ma
Cambrian
Nephrolenellus sp.
genus
6Animalia : Arthropoda : Trilobita : Redlichiida : Olenellidae : Nephrolenellus516 - 513 Ma
Cambrian
Bathynotus sp.
genus
6Animalia : Arthropoda : Trilobita : Redlichiida : Chengkouaspidae : Bathynotus516 - 513 Ma
Cambrian
Biceratops nevadensis
species
7Animalia : Arthropoda : Trilobita : Redlichiida : Holmiidae : Biceratops : Biceratops nevadensis516 - 513 Ma
Cambrian
Mesonacis sp.
genus
6Animalia : Arthropoda : Trilobita : Redlichiida : Olenellidae : Mesonacis516 - 513 Ma
Cambrian
Olenellidae
family
5Animalia : Arthropoda : Trilobita : Redlichiida : Olenellidae516 - 513 Ma
Cambrian
Olenellus sp.
genus
6Animalia : Arthropoda : Trilobita : Redlichiida : Olenellidae : Olenellus516 - 513 Ma
Cambrian
Olenellus gilberti
species
7Animalia : Arthropoda : Trilobita : Redlichiida : Olenellidae : Olenellus : Olenellus gilberti516 - 513 Ma
Cambrian
Paedeumias sp.
genus
6Animalia : Arthropoda : Trilobita : Redlichiida : Olenellidae : Paedeumias516 - 513 Ma
Cambrian
Brachiopoda
phylum
2Animalia : Brachiopoda516 - 513 Ma
Cambrian
Eothele sp.
genus
6Animalia : Brachiopoda : Lingulata : Lingulida : Acrothelidae : Eothele516 - 513 Ma
Cambrian
Eothele spurri
species
7Animalia : Brachiopoda : Lingulata : Lingulida : Acrothelidae : Eothele : Eothele spurri516 - 513 Ma
Cambrian
Paterina sp.
genus
6Animalia : Brachiopoda : Paterinidae : Paterina513 - 505 Ma
Cambrian
Ottoia sp.
genus
6Animalia : Ottoiidae : Ottoia513 - 501 Ma
Cambrian

References

Fritz W. H. (1968) Lower and early Middle Cambrian trilobites from the Pioche Shale, East-Central Nevada, U.S.A., Palaeontology 11, 36-43
Pack P. D., Gayle H. B. (1971) A new Olenellid trilobite, Biceratops nevadensis, from the Lower Cambrian near Las Vegas, Nevada, Journal of Paleontology 45 5, 893-898
Eddy J. D., McCollum L. B. (1998) Early Middle Cambrian Albertella biozone trilobites of the Pioche Shale, southeastern Nevada, Journal of Paleontology 72 5, 864-887
Palmer A. R. (1998) Terminal Early Cambrian extinction of the Olenellina: documentation from the Pioche Formation, Nevada, Journal of Paleontology 72 4, 650-672
Palmer A. R. (1999) Oak Springs Summit section, type locality for the base of the Delamaran Stage, Laurentia 99: V field conference of the Cambrian Stage Subdivision Working Group, International Subcomission on Cambrian Stratigraphy, 26-28
Sundberg F. A., McCollum L. B. (2000) Ptychoparid trilobites of the Lower-Middle Cambrian boundary interval, Pioche Shale, southeastern Nevada, Journal of Paleontology 74 4, 604-630
Sundberg F. A., McCollum L.B. (2003) Trilobites of the lower Middle Cambrian Poliella denticulata biozone (new) of southeastern Nevada, Journal of Paleontology 77 2, 331-359
Moore R. A., Lieberman B. S. (2009) Preservation of early and Middle Cambrian soft-bodied arthropods from the Pioche Shale, Nevada, USA, Palaeogeography, Palaeoclimatology, Palaeoecology 277, 57-62
Data courtesy of: PBDB: The Paleobiology Database, Creative Commons CC-BY licenced. , GBIF: the Global Biodiversity Information Facility, various licences, iDigBio, various licences, and EOL: The Encyclopedia of Life (Open Data Public Domain). Because fossils are made of minerals too!
 
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