Pass Peak Formation

The Pass Peak Formation is a Wasatchian geologic formation in Wyoming. It preserves fossils dating back to the Ypresian stage of the Eocene period.[1]

Pass Peak Formation Stratigraphic range: Ypresian (Wasatchian) ~55.8–50 Ma PreꞒ Ꞓ O S D C P T J K Pg N
Type	Formation
Location
Coordinates	42.7°N 110.1°W
Approximate paleocoordinates	47.7°N 93.5°W
Region	Wyoming
Country	United States
Extent	Green River Basin
Pass Peak Formation (the United States) Pass Peak Formation (Wyoming)

Fossil content

The following fossils have been found in the formation:[1][2]

Mammals

Artiodactyls

• Diacodexis sp.

Erinaceomorpha

• Diacodon celatus

Glires

• Paramys copei

Macroscelidea

• Adapisoricidae indet.

Perissodactyla

• Hyracotherium cf. vasacciense

Placentalia

• Hyopsodus cf. wortmani

Wasatchian correlations

Wasatchian correlations in North America

Formation	Wasatch	DeBeque	Claron	Indian Meadows	Pass Peak	Tatman	Willwood	Golden Valley	Coldwater	Allenby	Kamloops	Ootsa Lake	Margaret	Nanjemoy	Hatchetigbee	Tetas de Cabra	Hannold Hill	Coalmont	Cuchara	Galisteo	San Jose	Ypresian (IUCS) • Itaboraian (SALMA) Bumbanian (ALMA) • Mangaorapan (NZ)
Basin	Powder River Uinta Piceance Colorado Plateau Wind River Green River Bighorn	Piceance	Colorado Plateau	Wind River	Green River	Bighorn		Williston	Okanagan	Princeton	Buck Creek	Nechako	Sverdrup	Potomac	GoM	Laguna Salada	Rio Grande	North Park	Raton	Galisteo	San Juan	Pass Peak Formation (North America)
Country	United States								Canada					United States		Mexico	United States
Copelemur
Coryphodon
Diacodexis
Homogalax
Oxyaena
Paramys
Primates
Birds
Reptiles
Fish
Insects
Flora
Environments	Alluvial-fluvio-lacustrine	Fluvial				Fluvial	Fluvio-lacustrine	Fluvial	Lacustrine		Fluvio-lacustrine		Deltaic-paludal	Shallow marine		Fluvial	Shallow marine	Fluvial		Fluvial		Wasatchian volcanoclastics Wasatchian fauna Wasatchian flora
Volcanic	Yes	No							Yes	No	Yes	No	Yes	No						Yes	No

See also

• List of fossiliferous stratigraphic units in Wyoming
• Paleontology in Wyoming

References

1. Pass Peak Formation at Fossilworks.org
2. Dorr Jr., 1978

Bibliography

• Dorr, Jr, J. A. 1978. Revised and Amended Fossil Vertebrate Faunal Lists, Early Tertiary, Hoback Basin, Wyoming. Contributions to Geology, University of Wyoming 16. 79–84.