Thompson Creek (Eocene of the United States)

Where: Gallatin County, Montana (45.7° N, 111.0° W: paleocoordinates 47.5° N, 102.1° W)

• coordinate based on political unit

When: Chadronian (37.2 - 33.9 Ma)

Environment/lithology: terrestrial; poorly lithified claystone

• In these beds are...cracking clays...also light colored material ...containing lime. There are layers of limestone and strata of hard sandstone.

Size class: macrofossils

Primary reference: E. Douglass. 1902. Fossil Mammalia of the White River beds of Montana. Transactions of the American Philosophical Society 20:237-279 [J. Alroy/J. Alroy/W. Clyde]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 17028: authorized by John Alroy, entered by John Alroy on 18.02.1993

Creative Commons license: CC BY (attribution)

Taxonomic list

"Novacek leptictid" acutidens5
pers. commun. 16.2.00
 Rodentia - Eutypomyidae
Eutypomys cf. inexpectatus10 Wood 1974 rodent
 Rodentia - Ischyromyidae
Ischyromys sp.3 Leidy 1856 rodent
Ischyromys typus8 Leidy 1856 rodent
Ischyromys veterior8 Matthew 1903 rodent
 Rodentia - Cylindrodontidae
Cylindrodon sp.8 Douglass 1902 rodent
 Lagomorpha - Leporidae
Palaeolagus temnodon9 Douglass 1902 rabbit
from "Chadron... Three Forks, Montana"
 Perissodactyla - Brontotheriidae
Brontotheriidae indet. Marsh 1873 brontothere
 Perissodactyla - Tapiridae
? Colodon cingulatus6 Douglass 1902 tapir
 Perissodactyla - Equidae
Mesohippus bairdi1 Leidy 1850 anchitheriine horse
 Carnivora - Amphicyonidae
Brachyrhynchocyon sp.4 Scott and Jepsen 1936 bear-dog
"Thompson Creek"
 Carnivora - Canidae
Hesperocyon gregarius7 Cope 1873 canid
from "Thomson's Creek" and listed among Pipestone localities from Jefferson Co.
 Ungulata - Merycoidodontidae
Oreonetes anceps1 Douglass 1902 oreodont
Limnenetes platyceps n. sp. Douglass 1902 oreodont
 Ungulata - Agriochoeridae
Protoreodon minimus1 Douglass 1902 agriochoerid
 Ungulata - Protoceratidae
Trigenicus profectus2 Matthew 1903 protoceratid