Sage Creek Formation (Eocene of the United States)

Where: Beaverhead County, Montana (45.0° N, 112.8° W: paleocoordinates 49.2° N, 98.5° W)

• coordinate based on political unit

When: Bridgerian (50.3 - 46.2 Ma)

• said to be early Bridgerian

• formation-level stratigraphic resolution

Environment/lithology: terrestrial

Primary reference: A. R. Tabrum, D. R. Prothero, and D. Garcia. 1996. Magnetostratigraphy and biostratigraphy of the Eocene-Oligocene transition, southwestern Montana. In D. R. Prothero and R. J. Emry (eds.), The Terrestrial Eocene-Oligocene Transition in North America 278-311 [J. Alroy/J. Alroy/J. Alroy]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 16401: authorized by John Alroy, entered by John Alroy on 12.04.1997

Creative Commons license: CC BY (attribution)

Taxonomic list

Mammalia
 Perissodactyla - Brontotheriidae
Eotitanops sp. Osborn 1907 brontothere
Palaeosyops fontinalis Cope 1873 brontothere
 Perissodactyla -
Helaletes nanus Marsh 1871 odd-toed ungulate
includes "Heptodon?" of Douglass
 Perissodactyla - Hyrachyidae
"Hyrachyus priscus n. sp." = Hyrachyus douglassi
"Hyrachyus priscus n. sp." = Hyrachyus douglassi Wood 1934 odd-toed ungulate
falsely said by Wood 1934 to be from the same locality as what are now called the Dell beds, and not mentioned by Hough 1955