Where: Jefferson County, Montana (46.0° N, 112.0° W: paleocoordinates 46.6° N, 109.0° W)
• coordinate based on political unit
When: Sixmile Creek Formation, Miocene (23.0 - 5.3 Ma)
Environment/lithology: terrestrial
Primary reference: R. H. Tedford, T. Galusha, M. F. Skinner, B. E. Taylor, R. W. Fields, J. R. Macdonald, J. M. Rensberger, S. D. Webb, and D. P. Whistler. 1987. Faunal succession and biochronology of the Arikareean through Hemphillian interval (late Oligocene through earliest Pliocene epochs) in North America. In M. O. Woodburne (ed.), Cenozoic Mammals of North America: Geochronology and Biostratigraphy 153-210 [J. Alroy/J. Alroy/P. Wagner]more details
Purpose of describing collection: biostratigraphic analysis
PaleoDB collection 18969: authorized by John Alroy, entered by John Alroy on 27.09.1993
Creative Commons license: CC BY (attribution)
Taxonomic list
| Mammalia | |
"Hypsoparia cf. bozemanensis" = Leptarctus primus
"Hypsoparia cf. bozemanensis" = Leptarctus primus Leidy 1856 mustelid carnivore | |
"Merychippus cf. intermontanus" = Scaphohippus intermontanus, Acritohippus isonesus
"Merychippus cf. intermontanus" = Scaphohippus intermontanus Merriam 1915 horse
Acritohippus isonesus Cope 1889 horse | |
Dromomeryx borealis, "Rakomeryx kinseyi" = Subdromomeryx antilopinus
Dromomeryx borealis Cope 1877 ruminant
"Rakomeryx kinseyi" = Subdromomeryx antilopinus Scott 1893 ruminant possibly includes "Cranioceras kinseyi" specimen of Frick 1937 from "north end of N. Boulder Creek"
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Paracosoryx sp. Frick 1937 pronghorn
Merriamoceros sp. Frick 1937 pronghorn | |
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Proboscidea indet. proboscidean | |