Thompson Creek: Chadronian, Montana

List of taxa
Where & when
Geology
Taphonomy & methods
Metadata & references
Taxonomic list
unclassified
informal Novacek leptictid acutidens
Novacek 2000
pers. commun. 16.2.00
Mammalia - Carnivora - Amphicyonidae
Brachyrhynchocyon sp. Scott and Jepsen 1936
Hunt 1998
"Thompson Creek"
Mammalia - Carnivora - Canidae
Hesperocyon gregarius (Cope 1873)
Wang 1994
from "Thomson's Creek" and listed among Pipestone localities from Jefferson Co.
Mammalia - Perissodactyla - Equidae
Mesohippus latidens n. sp. Douglass 1903
of Douglass 1903 "Mesohippus sp."
Mammalia - Perissodactyla - Brontotheriidae
Brontotheriidae indet. (Marsh 1873)
"Titanotherium"
Mammalia - Perissodactyla - Tapiridae
Colodon sp. Marsh 1890
    = ? Colodon cingulatus Douglass 1902
Radinsky 1963
Mammalia - Merycoidodontidae
Limnenetes platyceps n. sp. Douglass 1902
? Limnenetes anceps n. sp. Douglass 1902
recombined as Oreonetes anceps
Mammalia - Protoceratidae
Trigenicus socialis n. sp. Douglass 1903
    = Trigenicus profectus Matthew 1903
Douglass 1903
Mammalia - Agriochoeridae
Agriochoerus minimus n. sp. Douglass 1902
recombined as Protoreodon minimus
Mammalia - Lagomorpha - Leporidae
Palaeolagus temnodon Douglass 1902
Wood 1940
from "Chadron... Three Forks, Montana"
Mammalia - Rodentia - Cylindrodontidae
Cylindrodon fontis Douglass 1902
    = Cylindrodon sp. Douglass 1902
Wood 1937
see discussion of this species by Emry and Korth 1996a DUPLICATE REF 3725 or 3745
Mammalia - Rodentia - Eutypomyidae
Eutypomys sp. Matthew 1905
    = Eutypomys cf. inexpectatus Wood 1974
Wood 1980
replaces ID of Wood 1937
Mammalia - Rodentia - Ischyromyidae
Ischyromys pliacus Troxell 1922
    = Ischyromys sp. Leidy 1856
Galbreath 1953
mentioned by Wood 1937
Ischyromys pliacus Troxell 1922
    = Ischyromys typus Leidy 1856
Wood 1937
DUPLICATE REF 3725 or 3745
Titanotheriomys veterior (Matthew 1903)
    = Ischyromys veterior Matthew 1903
Wood 1937
DUPLICATE REF 3725 or 3745
see common names

Geography
Country:United States State/province:Montana County:Gallatin
Coordinates: 45.7° North, 111.0° West (view map)
Paleocoordinates:47.5° North, 102.1° West
Basis of coordinate:based on political unit
Time
Period:Paleogene Epoch:Eocene
Stage:Priabonian 10 m.y. bin:Cenozoic 3
*Period:Tertiary
Key time interval:Chadronian
Age range of interval:37.00000 - 33.90000 m.y. ago
* legacy (obsolete) database fields
Stratigraphy
Lithology and environment
Primary lithology: poorly lithified claystone
Lithology description: In these beds are...cracking clays...also light colored material ...containing lime. There are layers of limestone and strata of hard sandstone.
Environment:terrestrial indet.
Taphonomy
Modes of preservation:body
Size of fossils:macrofossils
Collection methods and comments
Collection excludes:species names
Collection methods:field collection
Reason for describing collection:taxonomic analysis
Metadata
Database number:17028
Authorizer:J. Alroy Enterer:J. Alroy
Modifier:J. Wertheim Research group:vertebrate
Created:1993-02-18 00:00:00 Last modified:2002-07-26 14:00:38
Access level:the public Released:1993-02-18 00:00:00
Creative Commons license:CC BY
Reference information

Primary reference:
1381.5% 51860E. 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]

Secondary references:

6294 J. Alroy. 2002. Synonymies and reidentifications of North American fossil mammals. [J. Alroy/J. Alroy/M. Kouvari]
1382 E. Douglass. 1903. New vertebrates from the Montana Tertiary. Annals of Carnegie Museum 2(5):145-199 [J. Alroy/J. Alroy/J. Alroy]
1570 E. C. Galbreath. 1953. A contribution to the Tertiary geology and paleontology of northeastern Colorado. University of Kansas Paleontological Contributions Vertebrata 4:1-120 [J. Alroy/J. Alroy/J. Marcot]
1977 R. M. Hunt, Jr. 1998. Amphicyonidae. 196-227 [J. Alroy/J. Alroy/J. Alroy]
6324 M. J. Novacek. 2000. Personal communication regarding leptictid identifications. [J. Alroy/J. Alroy/J. Alroy]
2818 L. B. Radinsky. 1963. Origin and Early Evolution of North American Tapiroidea. Peabody Museum of Natural History Bulletin 17:1-118 [J. Alroy/J. Alroy/J. Marcot]
6226 X. Wang. 1994. Phylogenetic systematics of the Hesperocyoninae (Carnivora: Canidae). Bulletin of the American Museum of Natural History 221:1-207 [J. Alroy/J. Alroy/J. Alroy]
3725 A. E. Wood. 1937. The Mammalian Fauna of the White River Oligocene: Part II. Rodentia. Transactions of the American Philosophical Society 28(2):155-269 [J. Alroy/J. Alroy/J. Marcot]
3727 A. E. Wood. 1940. The Mammalian Fauna of the White River Oligocene: Part III. Lagomorpha. Transactions of the American Philosophical Society 28(3):271-362 [J. Alroy/J. Alroy/J. Ju]
3737 A. E. Wood. 1980. The Oligocene Rodents of North America. Transactions of the American Philosophical Society 70(5):1-68 [J. Alroy/J. Alroy/J. Ju]