Popo Agie Formation

Popo Agie Formation
Popo Agie Formation
Stratigraphic range: Late Triassic
Type	Geological formation
Unit of	Chugwater Group
Overlies	Gartra Formation
Location
Region	North America
Country	United States

The Popo Agie Formation (/poʊˈpoʊʒə/ poh-POH-zhə)^[1]^[2] is a Triassic geologic formation that crops out in western Wyoming, western Colorado, and Utah. It was deposited during the Late Triassic in fluvial (river) and lacustrine (lake) environments that existed across much of what is now the American southwest.^[3] Fragmentary fossils of prehistoric reptiles and amphibians, including pseudosuchian reptiles and temnospondyl amphibians, have been discovered in the Popo Agie Formation. Dinosaur remains are also among the fossils that have been recovered from the formation, although none have yet been referred to a specific genus.^[4]

Paleobiota

Color key

Taxon	Reclassified taxon	Taxon falsely reported as present	Dubious taxon or junior synonym	Ichnotaxon	Ootaxon	Morphotaxon

Notes
Uncertain or tentative taxa are in small text; ~~crossed out~~ taxa are discredited.

Amphibians

Taxon	Material	Notes
Apachesaurus sp.	Complete skull	A metoposaurid temnospondyl; specimen from the Popo Agie Formation was originally described as Anaschisma sp. and later Eupelor browni^[5]
Koskinonodon perfecta	Complete skull	A metoposaurid temnospondyl; specimen from the Popo Agie Formation was originally described as Borborophagus wyomingensis^[5]
Metoposauridae indet.	Complete skull	Specimen was originally described as Anaschisma browni^[5]

Reptiles

Taxon	Species	Material	Notes	Images
Heptasuchus	H. clarki	UW 11562, a partial skull and postcranial skeleton; UW 11563 through UW 11565, partial postcranial remains; both from Big Horn Mountains, Wyoming^[6]	A rauisuchian	(in background)
Beesiiwo	B. cooowuse	USNM 494329, a left maxilla and left dentary from Hole in the Wall, Wyoming; TxVP 46037.1, UWGM 7027 and UWGM 7028, maxillary fragments from Cottonwood Creek, Wyoming^[7]	A rhynchosaur, previously assigned to cf. Hyperodapedon sanjuanensis	(in foreground)
Poposaurus	P. gracilis	UR 358, a partial ilium from Lander, Wyoming;^[8] UR 357, a partial skeleton including vertebrae, hips, and limb bones^[9]	A bipedal poposauroid first described from the Popo Agie Formation and known from more complete specimens from the Chinle Formation^[10]

Synapsids

Taxon	Member	Material	Notes	Images
Eubrachiosaurus browni		FMNH UC 633, a partial left scapula, left humerus, and left pelvis from Lander, Wyoming	A dicynodont^[11]

Footnotes

^ Locally "po-PO-zha" according to Don Pitcher, 2006, Moon Handbooks Wyoming, p. 269 [1]
^ More ambiguous transcription of "po-po-zsha" at "Popo Agie Wilderness". The National Wilderness Preservation System. Wilderness.net. Retrieved 2008-03-08.
^ High, L.R.; Hepp, D.M.; Clark, T.; Picard, M.D. (1969). "Stratigraphy of Popo Agie Formation (Late Triassic), Uinta Mountain Area, Utah and Colorado". Geologic Guidebook of the Uinta Mountains: Utah's Maverick Range (Sixteenth Annual Field Conference ed.). Utah Geological Association. pp. 181–192.
^ Weishampel, et al. (2004). "Dinosaur distribution." Pp. 517-607.
^ ^a ^b ^c Sulej, T. (2002). "Species discrimination of the Late Triassic temnospondyl amphibian Metoposaurus diagnosticus" (PDF). Acta Palaeontologica Polonica. 47 (3): 535–546.
^ Dawley, R.M.; Zawiskie, J.M.; Cosgriff, J.W. (1979). "A rauisuchid thecodont from the Upper Triassic Popo Agie Formation of Wyoming". Journal of Paleontology. 53 (6): 1428–1431.
^ Fitch, A. J.; Haas, M.; C’Hair, W.; Ridgley, E.; Ridgley, B.; Oldman, D.; Reynolds, C.; Lovelace, D. M. (2023). "A New Rhynchosaur Taxon from the Popo Agie Formation, WY: Implications for a Northern Pangean Early-Late Triassic (Carnian) Fauna". Diversity. 15 (4): 544. doi:10.3390/d15040544. hdl:10919/114487.
^ Lees, J.H. (1907). "The skull of Paleorhinus, a Wyoming phytosaur". The Journal of Geology. 15 (2): 121–151. Bibcode:1907JG.....15..121L. doi:10.1086/621382. JSTOR 30056366. S2CID 129850970.
^ Mehl, M.G. (1915). "Poposaurus gracilis, a new reptile from the Triassic of Wyoming". The Journal of Geology. 23 (6): 516–522. Bibcode:1915JG.....23..516M. doi:10.1086/622268. JSTOR 30067173.
^ Gauthier, J.A.; Nesbitt, S.J.; Schachner, E.R.; Bever, G.S.; Joyce, W.G. (2011). "The bipedal stem crocodilian Poposaurus gracilis: inferring function in fossils and innovation in archosaur locomotion" (PDF). Bulletin of the Peabody Museum of Natural History. 52 (1): 107–126. doi:10.3374/014.052.0102. S2CID 86687464. Archived from the original (PDF) on 2015-09-24.
^ Kammerer, C. F.; Fröbisch, J. R.; Angielczyk, K. D. (2013). Farke, Andrew A (ed.). "On the Validity and Phylogenetic Position of Eubrachiosaurus browni, a Kannemeyeriiform Dicynodont (Anomodontia) from Triassic North America". PLOS ONE. 8 (5): e64203. Bibcode:2013PLoSO...864203K. doi:10.1371/journal.pone.0064203. PMC 3669350. PMID 23741307.

References

Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. 861 pp. ISBN 0-520-24209-2.

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[1] Locally "po-PO-zha" according to Don Pitcher, 2006, Moon Handbooks Wyoming, p. 269 [1]

[Popo-2] More ambiguous transcription of "po-po-zsha" at "Popo Agie Wilderness". The National Wilderness Preservation System. Wilderness.net. Retrieved 2008-03-08.

[HHCP69-3] High, L.R.; Hepp, D.M.; Clark, T.; Picard, M.D. (1969). "Stratigraphy of Popo Agie Formation (Late Triassic), Uinta Mountain Area, Utah and Colorado". Geologic Guidebook of the Uinta Mountains: Utah's Maverick Range (Sixteenth Annual Field Conference ed.). Utah Geological Association. pp. 181–192.

[dinosaurdistribution-4] Weishampel, et al. (2004). "Dinosaur distribution." Pp. 517-607.

[ST02-5] Sulej, T. (2002). "Species discrimination of the Late Triassic temnospondyl amphibian Metoposaurus diagnosticus" (PDF). Acta Palaeontologica Polonica. 47 (3): 535–546.

[DZC79-6] Dawley, R.M.; Zawiskie, J.M.; Cosgriff, J.W. (1979). "A rauisuchid thecodont from the Upper Triassic Popo Agie Formation of Wyoming". Journal of Paleontology. 53 (6): 1428–1431.

[Fitch2023-7] Fitch, A. J.; Haas, M.; C’Hair, W.; Ridgley, E.; Ridgley, B.; Oldman, D.; Reynolds, C.; Lovelace, D. M. (2023). "A New Rhynchosaur Taxon from the Popo Agie Formation, WY: Implications for a Northern Pangean Early-Late Triassic (Carnian) Fauna". Diversity. 15 (4): 544. doi:10.3390/d15040544. hdl:10919/114487.

[LJH07-8] Lees, J.H. (1907). "The skull of Paleorhinus, a Wyoming phytosaur". The Journal of Geology. 15 (2): 121–151. Bibcode:1907JG.....15..121L. doi:10.1086/621382. JSTOR 30056366. S2CID 129850970.

[MMG15-9] Mehl, M.G. (1915). "Poposaurus gracilis, a new reptile from the Triassic of Wyoming". The Journal of Geology. 23 (6): 516–522. Bibcode:1915JG.....23..516M. doi:10.1086/622268. JSTOR 30067173.

[Getal11-10] Gauthier, J.A.; Nesbitt, S.J.; Schachner, E.R.; Bever, G.S.; Joyce, W.G. (2011). "The bipedal stem crocodilian Poposaurus gracilis: inferring function in fossils and innovation in archosaur locomotion" (PDF). Bulletin of the Peabody Museum of Natural History. 52 (1): 107–126. doi:10.3374/014.052.0102. S2CID 86687464. Archived from the original (PDF) on 2015-09-24.

[KFA13-11] Kammerer, C. F.; Fröbisch, J. R.; Angielczyk, K. D. (2013). Farke, Andrew A (ed.). "On the Validity and Phylogenetic Position of Eubrachiosaurus browni, a Kannemeyeriiform Dicynodont (Anomodontia) from Triassic North America". PLOS ONE. 8 (5): e64203. Bibcode:2013PLoSO...864203K. doi:10.1371/journal.pone.0064203. PMC 3669350. PMID 23741307.

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