Matador Ranch (Upper) (Oligocene of the United States)

Also known as MV 7724, MV 7728

Where: Beaverhead County, Montana (45.0° N, 112.8° W: paleocoordinates 46.6° N, 104.7° W)

• coordinate based on political unit

• small collection-level geographic resolution

When: middle Member (Cook Ranch Formation), Orellan (33.9 - 33.3 Ma)

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 17138: authorized by John Alroy, entered by John Alroy on 12.04.1997, edited by Clint Boyd

Creative Commons license: CC BY (attribution)

Taxonomic list

 Rodentia - Cricetidae
Eumys sp. Leidy 1856 mouse
said to be new
 Rodentia - Aplodontidae
Prosciurus sp. Matthew 1903 mountain beaver
Brachygaulus leistneri n. sp. Korth and Tabrum 2011 mountain beaver
see Korth and Tabrum, 2011
 Rodentia - Eomyidae
Adjidaumo cf. minimus Matthew 1903 rodent
 Rodentia - Heliscomyidae
Heliscomys sp. Cope 1873 rodent
 Lagomorpha - Leporidae
? Palaeolagus sp. Leidy 1856 rabbit
"Palaeolagus" burkei Wood 1940 rabbit
 Perissodactyla - Hyracodontidae
? Hyracodon sp. Leidy 1856 odd-toed ungulate
 Perissodactyla - Equidae
Mesohippus sp. Marsh 1875 anchitheriine horse
 Tribosphenida - Soricidae
? Soricidae indet. Fischer 1814 shrew
 Tribosphenida - Proscalopidae
? Oligoscalops sp. Reed 1961 placental
 Carnivora - Canidae
Hesperocyon gregarius Cope 1873 canid
 Theriiformes - Herpetotheriidae
"Herpetotherium fugax" = Peratherium fugax Cope 1873 marsupial
Copedelphys cf. stevensoni Cope 1873 marsupial
 Artiodactyla - Camelidae
Poebrotherium sp. Leidy 1847 camel
 Artiodactyla - Leptomerycidae
Leptomeryx aff. evansi Leidy 1853 ruminant