Huerfano IV (Eocene of the United States)

Also known as small arroyo north of Colorado Highway 69; two miles east of Gardner Butte

Where: Huerfano County, Colorado (37.8° N, 105.1° W: paleocoordinates 42.2° N, 89.4° W)

• coordinate based on political unit

• small collection-level geographic resolution

When: Farisita Formation, Wasatchian (55.8 - 50.3 Ma)

• "This locality is in the Farisita facies."

Environment/lithology: terrestrial; brown, gray mudstone

• "The best collecting is from gray-brown mudstone that crops out in the NE part of the arroyo. The bed lacks concretions and has a "soft" texture. The bone from this locality is broken but often has an almost "recent" appearance and color."

Size classes: macrofossils, mesofossils

Primary reference: P. Robinson. 1966. Fossil Mammalia of the Huerfano Formation, Eocene, of Colorado. Peabody Museum of Natural History Bulletin 21:1-95 [J. Alroy/J. Alroy/J. Marcot]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 15649: authorized by John Alroy, entered by John Alroy on 18.02.1993

Creative Commons license: CC BY (attribution)

Taxonomic list

• Lostcabinian
Coryphodon "molestus" Lucas and Schoch 1987: "C. sp."; from "1/4 mi NW of other specimens"
Mammalia
 Primates - Microsyopidae
Microsyops scottianus1 Cope 1881 primate
 Condylarthra - Hyopsodontidae
Hyopsodus walcottianus Matthew 1915 condylarth
OK according to Redline 1997
 Perissodactyla - Brontotheriidae
Lambdotherium popoagicum Cope 1880 brontothere
 Perissodactyla -
? Heptodon sp. Cope 1882 odd-toed ungulate
 Perissodactyla - Equidae
"Protorohippus venticolus" = Protorohippus venticolum1
"Protorohippus venticolus" = Protorohippus venticolum1 Cope 1881 horse
 Ferae - Viverravidae
Viverravus gracilis Marsh 1872 placental
 Artiodactyla - Diacodexeidae
Bunophorus sinclairi2 Guthrie 1966 even-toed ungulate