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Placerias Quarry, Supai Salt Basin, Arizona, USA

Lat/Long (Decimal)34.4374,-109.462
Co-ordinates Derivationstated in text
Given LocationArizona, United States
Mindat.org Region (for given coordinates)Supai Salt Basin, Arizona, USA

Collections

CollectionReferenceStratigraphic NameCommentsLithologyAge
Placerias Quarry, UCMP A269Camp C. L., Welles S. P. (1956)Chinle - Mesa RedondoOne of two nearly adjacent quarries (the second is the Downs Quarry, 30 metres from the Placerias Quarry). Early workers placed the Placerias Quarry low in the Blue Mesa Member, while Lucas et al. (1997) assigned it to the Mesa Redondo (= Bluewater Creek) Member. Parker (2005) noted that the lithology of the beds and the local presence of the Shinarump Member (the basal member of the Chinle Formation) supports the Mesa Redondo assignment. Earliest Adamanian LVFmudstone228 - 208.5 Ma
Late/Upper Triassic

Recorded Fossils

Accepted NameHierarchyAge
Gyrolepis sp.
genus
Animalia : Chordata : Actinopteri : Palaeonisciformes : Palaeoniscidae : Gyrolepis228 - 208.5 Ma
Late/Upper Triassic
Turseodus sp.
genus
Animalia : Chordata : Actinopterygii : Palaeoniscidae : Turseodus228 - 208.5 Ma
Late/Upper Triassic
Cionichthys sp.
genus
Animalia : Chordata : Actinopteri : Palaeonisciformes : Redfieldiidae : Cionichthys228 - 208.5 Ma
Late/Upper Triassic
Lasalichthys sp.
genus
Animalia : Chordata : Actinopteri : Palaeonisciformes : Redfieldiidae : Lasalichthys228 - 208.5 Ma
Late/Upper Triassic
Redfieldiidae
family
Animalia : Chordata : Actinopteri : Palaeonisciformes : Redfieldiidae228 - 208.5 Ma
Late/Upper Triassic
Australosomus sp.
genus
Animalia : Chordata : Actinopteri : Pholidopleuriformes : Pholidopleuridae : Australosomus228 - 208.5 Ma
Late/Upper Triassic
Semionotidae
family
Animalia : Chordata : Actinopteri : Semionotiformes : Semionotidae228 - 208.5 Ma
Late/Upper Triassic
Chondrichthyes
class
Animalia : Chordata : Chondrichthyes228 - 208.5 Ma
Late/Upper Triassic
Acrodus sp.
genus
Animalia : Chordata : Chondrichthyes : Hybodontiformes : Acrodontidae : Acrodus228 - 208.5 Ma
Late/Upper Triassic
Lonchidion humblei
species
Animalia : Chordata : Chondrichthyes : Hybodontiformes : Lonchidiidae : Lonchidion : Lonchidion humblei228 - 208.5 Ma
Late/Upper Triassic
Phoebodus sp.
genus
Animalia : Chordata : Chondrichthyes : Phoebodontiformes : Phoebodontidae : Phoebodus228 - 208.5 Ma
Late/Upper Triassic
Triodus moorei
species
Animalia : Chordata : Chondrichthyes : Xenacanthiformes : Xenacanthidae : Triodus : Triodus moorei228 - 208.5 Ma
Late/Upper Triassic
Chinlea sp.
genus
Animalia : Chordata : Coelacanthimorpha : Coelacanthiformes : Mawsoniidae : Chinlea228 - 208.5 Ma
Late/Upper Triassic
Coelacanthidae
family
Animalia : Chordata : Sarcopterygii : Coelacanthiformes : Coelacanthidae228 - 208.5 Ma
Late/Upper Triassic
Ornithischia
unranked clade
Animalia : Chordata : Ornithischia228 - 208.5 Ma
Late/Upper Triassic
Cynodontia
family
Animalia : Chordata : Cynodontia228 - 208.5 Ma
Late/Upper Triassic
Placerias hesternus
species
Animalia : Chordata : Osteichthyes : Cotylosauria : Stahleckeriidae : Placerias : Placerias hesternus228 - 208.5 Ma
Late/Upper Triassic
Ceratodus sp.
genus
Animalia : Chordata : Sarcopterygii : Ceratodontiformes : Ceratodontidae : Ceratodus228 - 208.5 Ma
Late/Upper Triassic
Osteichthyes
unranked clade
Animalia : Chordata : Osteichthyes228 - 208.5 Ma
Late/Upper Triassic
Apachesaurus gregorii
species
Animalia : Chordata : Amphibia : Metoposauridae : Apachesaurus : Apachesaurus gregorii228 - 208.5 Ma
Late/Upper Triassic
Koskinonodon perfectus
species
Animalia : Chordata : Osteichthyes : Temnospondyli : Metoposauridae : Koskinonodon : Koskinonodon perfectus228 - 208.5 Ma
Late/Upper Triassic
Temnospondyli
unranked clade
Animalia : Chordata : Osteichthyes : Temnospondyli228 - 208.5 Ma
Late/Upper Triassic
Vancleavea campi
species
Animalia : Chordata : Reptilia : Doswelliidae : Vancleavea : Vancleavea campi228 - 208.5 Ma
Late/Upper Triassic
Kuehneosauridae
family
Animalia : Chordata : Reptilia : Squamata : Kuehneosauridae228 - 208.5 Ma
Late/Upper Triassic
Dromomeron gregorii
species
Animalia : Chordata : Reptilia : Lagerpetonidae : Dromomeron : Dromomeron gregorii228 - 208.5 Ma
Late/Upper Triassic
Archosauria
unranked clade
Animalia : Chordata : Reptilia : Eosuchia : Archosauria228 - 208.5 Ma
Late/Upper Triassic
Archosauriformes
unranked clade
Animalia : Chordata : Reptilia : Eosuchia : Archosauriformes228 - 208.5 Ma
Late/Upper Triassic
Crocodylomorpha
unranked clade
Animalia : Chordata : Reptilia : Eosuchia : Crocodylomorpha228 - 208.5 Ma
Late/Upper Triassic
Dinosauria
order
Animalia : Chordata : Reptilia : Dinosauria228 - 208.5 Ma
Late/Upper Triassic
Dinosauriformes
unranked clade
Animalia : Chordata : Reptilia : Eosuchia : Lagosuchus : Dinosauriformes228 - 208.5 Ma
Late/Upper Triassic
Hesperosuchus agilis
species
Animalia : Chordata : Reptilia : Sphenosuchidae : Hesperosuchus : Hesperosuchus agilis228 - 208.5 Ma
Late/Upper Triassic
Lepidosauromorpha
unranked clade
Animalia : Chordata : Reptilia : Eosuchia : Lepidosauromorpha228 - 208.5 Ma
Late/Upper Triassic
Phytosauria
unranked clade
Animalia : Chordata : Reptilia : Eosuchia : Phytosauria228 - 208.5 Ma
Late/Upper Triassic
Poposaurus gracilis
species
Animalia : Chordata : Reptilia : Poposauridae : Poposaurus : Poposaurus gracilis228 - 208.5 Ma
Late/Upper Triassic
Revueltosaurus hunti
species
Animalia : Chordata : Reptilia : Revueltosaurus : Revueltosaurus hunti228 - 208.5 Ma
Late/Upper Triassic
Tecovasaurus murryi
species
Animalia : Chordata : Reptilia : Tecovasaurus : Tecovasaurus murryi228 - 208.5 Ma
Late/Upper Triassic
Trilophosaurus sp.
genus
Animalia : Chordata : Reptilia : Trilophosauridae : Trilophosaurus228 - 208.5 Ma
Late/Upper Triassic
Trilophosaurus jacobsi
species
Animalia : Chordata : Reptilia : Trilophosauridae : Trilophosaurus : Trilophosaurus jacobsi228 - 208.5 Ma
Late/Upper Triassic
Uatchitodon schneideri
species
Animalia : Chordata : Reptilia : Uatchitodon : Uatchitodon schneideri228 - 208.5 Ma
Late/Upper Triassic
Leptosuchus sp.
genus
Animalia : Chordata : Reptilia : Thecodontia : Parasuchidae : Leptosuchus228 - 208.5 Ma
Late/Upper Triassic
Rutiodon sp.
genus
Animalia : Chordata : Reptilia : Phytosauridae : Rutiodon228 - 208.5 Ma
Late/Upper Triassic
Smilosuchus adamanensis
species
Animalia : Chordata : Reptilia : Thecodontia : Parasuchidae : Smilosuchus : Machaeroprosopus adamanensis228 - 208.5 Ma
Late/Upper Triassic
Proterochampsidae
family
Animalia : Chordata : Reptilia : Crocodylia : Proterochampsidae228 - 208.5 Ma
Late/Upper Triassic
Postosuchus kirkpatricki
species
Animalia : Chordata : Reptilia : Crocodylia : Rauisuchidae : Postosuchus : Postosuchus kirkpatricki228 - 208.5 Ma
Late/Upper Triassic
Shuvosaurus inexpectatus
species
Animalia : Chordata : Reptilia : Shuvosauridae : Shuvosaurus : Shuvosaurus inexpectatus228 - 208.5 Ma
Late/Upper Triassic
Acaenasuchus geoffreyi
species
Animalia : Chordata : Reptilia : Stagonolepididae : Acaenasuchus : Acaenasuchus geoffreyi228 - 208.5 Ma
Late/Upper Triassic
Calyptosuchus wellesi
species
Animalia : Chordata : Reptilia : Thecodontia : Aetosauridae : Calyptosuchus : Calyptosuchus wellesi228 - 208.5 Ma
Late/Upper Triassic
Desmatosuchus spurensis
species
Animalia : Chordata : Reptilia : Thecodontia : Desmatosuchidae : Desmatosuchus : Desmatosuchus spurensis228 - 208.5 Ma
Late/Upper Triassic
Tecovasuchus sp.
genus
Animalia : Chordata : Reptilia : Stagonolepididae : Tecovasuchus228 - 208.5 Ma
Late/Upper Triassic
Tecovasuchus chatterjeei
species
Animalia : Chordata : Reptilia : Stagonolepididae : Tecovasuchus : Tecovasuchus chatterjeei228 - 208.5 Ma
Late/Upper Triassic
Tanytrachelos sp.
genus
Animalia : Chordata : Reptilia : Tanystropheidae : Tanytrachelos228 - 208.5 Ma
Late/Upper Triassic
Drepanosauridae
family
Animalia : Chordata : Reptilia : Drepanosauridae228 - 208.5 Ma
Late/Upper Triassic
Palacrodon sp.
genus
Animalia : Chordata : Reptilia : Rhynchocephalia : Sphenodontidae : Palacrodon228 - 208.5 Ma
Late/Upper Triassic
Procolophonidae
family
Animalia : Chordata : Reptilia : Procolophonidae228 - 208.5 Ma
Late/Upper Triassic
Pterosauria
order
Animalia : Chordata : Reptilia : Pterosauria228 - 208.5 Ma
Late/Upper Triassic
Sphenodontidae
family
Animalia : Chordata : Reptilia : Rhynchocephalia : Sphenodontidae228 - 208.5 Ma
Late/Upper Triassic
Herrerasauridae
family
Animalia : Chordata : Saurischia : Herrerasauridae228 - 208.5 Ma
Late/Upper Triassic
Saurischia
unranked clade
Animalia : Chordata : Saurischia228 - 208.5 Ma
Late/Upper Triassic
Theropoda
unranked clade
Animalia : Chordata : Saurischia : Theropoda228 - 208.5 Ma
Late/Upper Triassic

References

Camp C. L., Welles S. P. (1956) Triassic dicynodont reptiles. Part 1, Memoirs of the University of California 13, 255-341
Tannenbaum F. A. (1983) The microvertebrate fauna of the Placerias and Downs Quarries, Chinle Formation (Upper Triassic) near St. Johns, Arizona, University of California, Berkeley, 1-117
Murry P. A. (1987) New reptiles from the Upper Triassic Chinle Formation of Arizona, Journal of Paleontology 61 4, 773-786
Murry P. A., Long R. A. (1989) Geology and paleontology of the Chinle Formation, Petrified Forest National Park and vicinity, Arizona and a discussion of vertebrate fossils of the southwestern Upper Triassic, Dawn of the Age of Dinosaurs in the American Southwest, New Mexico Museum of Natural History, Albuquerque, 29-64
Kaye F. T., Padian K. (1994) Microvertebrates from the Placerias Quarry: a window on Late Triassic vertebrate diversity in the American Southwest, In the Shadow of the Dinosaurs: Early Mesozoic Tetrapods, N. C. Fraser and H.-D. Sues (eds.), Cambridge University Press, 172-196
Hunt A. P., Lucas S. G. (1994) Ornithischian dinosaurs from the Upper Triassic of the United States, In N. C. Fraser & H.-D. Sues (eds.), In the Shadow of the Dinosaurs: Early Mesozoic Tetrapods. Cambridge University Press, Cambridge, 227-241
Long R. A., Murry P. A. (1995) Late Triassic (Carnian and Norian) tetrapods from the southwestern United States, New Mexico Museum of Natural History and Science Bulletin 4, 1-254
Hunt A. P., Lucas S. G., et al (1998) Late Triassic dinosaurs from the western United States, Géobios 31 4, 511-531
Irmis R. B. (2005) The vertebrate fauna of the Upper Triassic Chinle Formation in northern Arizona, In S. J. Nesbitt, W. G. Parker, & R. B. Irmis (eds.), Guidebook to the Triassic Formations of the Colorado Plateau in Northern Arizona: Geology, Paleontology, and History. Mesa Southwest Museum Bulletin 9, 63-88
Heckert A. B., Lucas S. G., et al (2005) Triassic vertebrate fossils in Arizona, Vertebrate Paleontology in Arizona. New Mexico Museum of Natural History and Science Bulletin 29, 16-44
Heckert A. B., Lucas S. G., et al (2006) Revision of the archosauromorph reptile Trilophosaurus, with a description of the first skull of Trilophosaurus jacobsi, from the Upper Triassic Chinle Group, West Texas, USA, Palaeontology 49 3, 621-640
Heckert A. B., Spielmann J. A., et al (2007) Biostratigraphic utility of the Upper Triassic aetosaur Tecovasuchus (Archosauria: Stagonolepididae), an index taxon of St. Johnsian (Adamanian: late Carnian) time, New Mexico Museum of Natural History and Science Bulletin 41, 51-57
Nesbitt S. J., Irmis R. B., et al (2007) A critical re-evaluation of the Late Triassic dinosaur taxa of North America, Journal of Systematic Palaeontology 5 2, 209-243
Parker W. G. (2008) Description of new material of the aetosaur Desmatosuchus spuriensis (Archosauria: Suchia) from the Chinle Formation of Arizona and a revision of the genus, PaleoBios 28, 1-40
Nesbitt S. J., Stocker M. R., et al (2009) The osteology and relationships of Vancleavea campi (Reptilia: Archosauriformes), Zoological Journal of the Linnean Society 157, 814-864 doi:10.1111/j.1096-3642.2009.00530.x
Renesto S. C., Spielmann J. A., et al (2009) The oldest record of drepanosaurids (Reptilia, Diapsida) from the Late Triassic (Adamanian Placerias Quarry, Arizona, USA) and the stratigraphic range of the Drepanosauridae, Neues Jahrbuch für Paläontologie und Geologie, Abhandlungen 252 3, 315-325
Nesbitt S. J., Irmis R. B., et al (2009) Hindlimb osteology and distribution of basal dinosauromorphs from the Late Triassic of North America, Journal of Vertebrate Paleontology 29 2, 498-516 doi:10.1671/039.029.0218
Mitchell J. S., Heckert A. B., et al (2010) Grooves to tubes: evolution of the venom delivery system in a Late Triassic reptile, Naturwissenschaften 97, 1117-1121 doi:10.1007/s00114-010-0729-0
Kligman B. T., Marsh A. D., et al (2018) First records of diapsid Palacrodon from the Norian, Late Triassic Chinle Formation of Arizona, and their biogeographic implications, Acta Palaeontologica Polonica 63 1, 117-127 doi:10.4202/app.00426.2017
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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