Twelve-Fifteen Mile District ( of the United States)

Where: Goshen County, Wyoming (42.0° N, 104.2° W: paleocoordinates 42.9° N, 99.2° W)

• coordinate based on political unit

When: Harrisonian (24.8 - 20.4 Ma)

Environment/lithology: terrestrial

Primary reference: W. W. Korth. 1997. A new subfamily of primitive pocket mice (Rodentia, Heteromyidae) from the middle Tertiary of North America. Paludicola 1(2):33-66 [J. Alroy/J. Alroy/J. Marcot]more details

PaleoDB collection 17847: authorized by John Alroy, entered by John Alroy on 26.03.1995

Creative Commons license: CC BY (attribution)

Taxonomic list

• formation unclear but reported as Marsland equivalent by Frick and Taylor 1968 (whose usage is questionable) and Korth 1997a, and Upper Harrison by Wang et al. 1999
Mammalia
 Carnivora - Canidae
Desmocyon thomsoni4 Matthew 1907 bone-crushing dog
 Artiodactyla - Camelidae
Stenomylus gracilis2 Peterson 1907 camel
 Artiodactyla - Merycoidodontidae
Merychyus arenarum3 Cope 1884 oreodont
Merychyus minimus3 Peterson 1907 oreodont
 Artiodactyla - Moschidae
"Pseudoblastomeryx falkenbachi" = Pseudoblastomeryx advena1
"Pseudoblastomeryx falkenbachi" = Pseudoblastomeryx advena1 Matthew 1907 musk deer
 Rodentia - Heteromyidae
Schizodontomys sulcidens Rensberger 1973 rodent
"Marsland... 12-15 miles south of Lusk"