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

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. 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.

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
Koskinonodon perfecta	Complete skull	A metoposaurid temnospondyl; specimen from the Popo Agie Formation was originally described as Borborophagus wyomingensis
Metoposauridae indet.	Complete skull	Specimen was originally described as Anaschisma browni

Reptiles

Taxon	Material	Notes	Images
Heptasuchus clarki	UW 11562, a partial skull and postcranial skeleton; UW 11563 through UW 11565, partial postcranial remains; both from Big Horn Mountains, Wyoming	A rauisuchian	(in background)
Beesiiwo 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	A rhynchosaur, previously assigned to cf. Hyperodapedon sanjuanensis	(in foreground)
Poposaurus gracilis	UR 358, a partial ilium from Lander, Wyoming; UR 357, a partial skeleton including vertebrae, hips, and limb bones	A bipedal poposauroid first described from the Popo Agie Formation and known from more complete specimens from the Chinle Formation

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

Footnotes

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.