Phil Mass Ranch (Eocene of the United States)

Also known as Ringdahl Ranch

Where: Sweetwater County, Wyoming (41.7° N, 109.0° W: paleocoordinates 45.6° N, 95.1° W)

• coordinate based on political unit

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

Environment/lithology: terrestrial

Primary reference: L. Krishtalka. 1976. Early Tertiary Adapisoricidae and Erinaceidae (Mammalia, Insectivora) of North America. Bulletin of Carnegie Museum of Natural History 1 [J. Alroy/J. Alroy/J. Ju]more details

PaleoDB collection 16283: authorized by John Alroy, entered by John Alroy on 26.03.1995

Creative Commons license: CC BY (attribution)

Taxonomic list

• shown in map of Wheeler 1961 to be NE of Cedar Mountain and W of Twin Buttes and clearly in the Twin Buttes Mbr. based on map of West 1976a
none of the references place this definitively in C or D
Mammalia
 Rodentia - Ischyromyidae
Thisbemys corrugatus5 Wood 1959 rodent
"presumably" Twin Buttes Mbr.
 Lipotyphla - Geolabididae
Centetodon pulcher2 Marsh 1872 placental
 Perissodactyla - Hyrachyidae
"Hyrachyus affinis" = Hyrachyus modestus4
"Hyrachyus affinis" = Hyrachyus modestus4 Leidy 1870 odd-toed ungulate
"P. M. Ranch, H. F. (presumably Henry's Fork, and hence C or D)"; I believe "H. F." is a reference to Henry's Fork Table, i.e., Cedar Mountain
 Macroscelidea - Amphilemuridae
Scenopagus edenensis McGrew et al. 1959 elephant shrew
upper Bridger
 Ungulata - Homacodontidae
Homacodon vagans3 Marsh 1872 even-toed ungulate
 Insectivora - Apatemyidae
Apatemys sp.1 Marsh 1872 insectivoran