Muddy Ridge (Eocene of the United States)

Where: Fremont County, Wyoming (43.2° N, 108.2° W: paleocoordinates 48.0° N, 91.4° W)

• coordinate based on political unit

When: Wind River Formation, Wasatchian (55.8 - 50.3 Ma)

Environment/lithology: terrestrial

Primary reference: W. R. Keefer and M. L. Troyer. 1964. Geology of the Shotgun Butte area, Fremont County, Wyoming. United States Geological Survey Bulletin 1157:1-123 [J. Alroy/J. Alroy/J. Ju]more details

PaleoDB collection 15996: authorized by John Alroy, entered by John Alroy on 30.04.1994

Creative Commons license: CC BY (attribution)

Taxonomic list

• this could be the MCZ "Muddy Creek" locality of Schoch 1986, from "late Wasatchian strata of the Wind River Formation... Wind River Basin" yielding Stylinodon mirus
Loveina zephyri Szalay 1976: MCZ from "Lost Cabin beds... Muddy Creek, 10 miles north of Pavillion, Wind River Basin" - type of "Tetonius barbeyi"
said to be "of Lost Cabin age"
Mammalia
 Primates - Microsyopidae
"Cynodontomys sp." = Microsyops
"Cynodontomys sp." = Microsyops Leidy 1872 primate
 Primates - Adapidae
Adapidae indet. Trouessart 1879 primate
 Perissodactyla - Brontotheriidae
Lambdotherium popoagicum Cope 1880 brontothere
 Perissodactyla -
"Heptodon brownorum" = Heptodon posticus
"Heptodon brownorum" = Heptodon posticus Cope 1882 odd-toed ungulate
 Perissodactyla - Palaeotheriidae
Hyracotherium sp. Owen 1841 odd-toed ungulate
 Theriamorpha - Phenacodontidae
Ectocion sp. Cope 1882 condylarth
Phenacodus sp. Cope 1873 condylarth
 Condylarthra - Hyopsodontidae
Hyopsodus sp. Leidy 1870 condylarth
large
Hyopsodus cf. mentalis Cope 1875 condylarth