Marsh's Fork (Lower Bridger) (Eocene of the United States)

Where: Uinta County, Wyoming (41.2° N, 110.5° W: paleocoordinates 45.2° N, 96.8° W)

• coordinate based on political unit

When: lower Member (Bridger Formation), Bridgerian (50.3 - 46.2 Ma)

Environment/lithology: terrestrial

Primary reference: C. L. Gazin. 1976. Mammalian Faunal Zones of the Bridger Middle Eocene. Smithsonian Contributions to Paleobiology 26:1-25 [J. Alroy/J. Alroy/J. Marcot]more details

PaleoDB collection 16281: authorized by John Alroy, entered by John Alroy on 15.05.2002, edited by Terri Cleary

Creative Commons license: CC BY (attribution)

Taxonomic list

• locality fixed by Wood 1934
Mammalia
 Perissodactyla - Equidae
Orohippus pumilus1 Marsh 1871 horse
(apparent type locality of L. pumilis, now re-id'd to Orohippus which has its type locality elsewhere)
 Perissodactyla - Hyrachyidae
"Hyrachyus affinis n. sp." = Hyrachyus modestus
"Hyrachyus affinis n. sp." = Hyrachyus modestus Leidy 1870 odd-toed ungulate
from "near Grizzly Buttes, one mile from Marsh's Fork": see Troxell 1922e; probably Bridger B2, see Wood 1934
Reptilia
 Squamata - Rhineuridae
Lestophis crassus n. sp.2 Marsh 1871 worm lizard
YPM 531, single cervical vertebra. "Marsh Fork, about 15 miles from Fort Bridger"