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The Popo Agie Formation 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.[1] 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.[2]
Popo Agie Formation | |
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Stratigraphic range: Late Triassic | |
Type | Geological formation |
Unit of | Chugwater Group |
Overlies | Gartra Formation |
Location | |
Region | North America |
Country | United States |
Color key
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Notes Uncertain or tentative taxa are in small text; |
Taxon | Member | Material | Notes | Images |
---|---|---|---|---|
Apachesaurus sp. |
Complete skull |
A metoposaurid temnospondyl; specimen from the Popo Agie Formation was originally described as Anaschisma sp. and later Eupelor browni[3] |
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Complete skull |
A metoposaurid temnospondyl; specimen from the Popo Agie Formation was originally described as Borborophagus wyomingensis[3] |
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Metoposauridae indet. |
Complete skull |
Specimen was originally described as Anaschisma browni[3] |
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Taxon | Species | Member | Material | Notes | Images |
---|---|---|---|---|---|
H. clarki |
UW 11562, a partial skull and postcranial skeleton; UW 11563 through UW 11565, partial postcranial remains; both from Big Horn Mountains, Wyoming[4] |
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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[5] |
A rhynchosaur, previously assigned to cf. Hyperodapedon sanjuanensis |
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P. gracilis |
UR 358, a partial ilium from Lander, Wyoming;[6] UR 357, a partial skeleton including vertebrae, hips, and limb bones[7] |
A bipedal poposauroid first described from the Popo Agie Formation and known from more complete specimens from the Chinle Formation[8] |
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Taxon | Member | Material | Notes | Images |
---|---|---|---|---|
FMNH UC 633, a partial left scapula, left humerus, and left pelvis from Lander, Wyoming |
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