Railroad Canyon (Miocene of the United States)

Where: Lemhi County, Idaho (45.0° N, 113.6° W: paleocoordinates 45.7° N, 110.4° W)

• coordinate based on political unit

When: uppermost Member (Railroad Canyon Beds Formation), Barstovian (16.0 - 13.6 Ma)

Environment/lithology: terrestrial

Primary reference: R. Nichols. 1998. Idaho Museum of Natural History Occasional Paper 36:10-12 [J. Alroy/J. Alroy]more details

PaleoDB collection 19013: authorized by John Alroy, entered by John Alroy on 13.10.1998

Creative Commons license: CC BY (attribution)

Taxonomic list

• Nichols' list includes so many invalid names that it must be considered suspect
"geomyid" apparently comes from a much lower part of the section

"Merycodus sp." seems dubious because Nichols goes on to list Cosoryx later in the list, after the tayassuids, which suggests they are the same thing
Mammalia
 Rodentia - Heteromyidae
Heteromyidae indet. Gray 1868 rodent
 Rodentia - Castoridae
Castoridae indet.1 Gray 1821 beaver
 Lagomorpha - Leporidae
Leporidae indet. Fischer de Waldheim 1817 rabbit
this may include Hypolagus gidleyi of White 1988 from "Railroad Canyon" (state not specified, and said to be Blancan)
 Lagomorpha - Ochotonidae
Ochotonidae indet.1 Thomas 1897 pika
 Lipotyphla - Talpidae
Talpidae indet. Fischer de Waldheim 1817 mole
 Perissodactyla - Rhinocerotidae
Rhinocerotidae indet. Gray 1821 rhinoceros
 Perissodactyla - Equidae
Equidae indet.1 Gray 1821 horse
Equinae indet.1 Steinmann and Döderlein 1890 horse
Acritohippus isonesus1 Cope 1889 horse
Archaeohippus ultimus1 Cope 1886 anchitheriine horse
Hypohippus sp. Leidy 1858 anchitheriine horse
 Carnivora - Amphicyonidae
Amphicyonidae indet.1 Haeckel 1886 bear-dog
 Carnivora - Canidae
Canidae indet. Fischer 1817 canid
 Ungulata - Merycoidodontidae
Ticholeptus zygomaticus2 Cope 1878 oreodont
Brachycrus sp.3 Matthew 1901 oreodont
from "Railroad Canyon, near Tunnel Draw, Lemhi County" and "B. sp." of Nichols; said by Kelly and Lander 1988 to be "B. laticeps"
Merychyus elegans2 Leidy 1858 oreodont
 Ungulata - Tayassuidae
Tayassuidae indet.1 Palmer 1897 peccary
Cynorca sp. Cope 1867 peccary
 Ungulata - Camelidae
Aepycamelus sp. Macdonald 1956 camel
 Ungulata - Palaeomerycidae
Dromomeryx sp. Douglass 1909 ruminant
 Ungulata - Antilocapridae
Cosoryx sp. Leidy 1869 pronghorn