Chalky Buttes Slump Block (Oligocene of the United States)

Where: Slope County, North Dakota (46.4° N, 103.3° W: paleocoordinates 47.4° N, 95.5° W)

• coordinate based on political unit

When: Brule Formation, Whitneyan (33.3 - 30.8 Ma)

Environment/lithology: terrestrial

Primary reference: N. M. Denson and J. R. Gill. 1965. Uranium-bearing lignite and carbonaceous shale in the southwestern part of the Williston Basin - a regional study, with a section on heavy minerals in Cretaceous and Tertiary rocks associated with uranium occurrences. United States Geological Survey Professional Paper 463:1-75 [J. Alroy/J. Alroy/J. Ju]more details

PaleoDB collection 17320: authorized by John Alroy, entered by John Alroy on 17.06.2000

Creative Commons license: CC BY (attribution)

Taxonomic list

• entire collection is from NE 1/4 NW 1/4 sec 31 T134N R100W and appears to be younger than Orellan Chalky Buttes material of other authors
IDs by Hough
Mammalia
 Rodentia - Cricetidae
Eumys sp. Leidy 1856 mouse
 Rodentia - Aplodontidae
Aplodontidae indet. Brandt 1855 mountain beaver
 Rodentia - Sciuridae
? Cedromus sp. Wilson 1949 squirrel
 Rodentia - Eomyidae
? Paradjidaumo sp. Burke 1934 rodent
 Lagomorpha - Leporidae
Palaeolagus sp. Leidy 1856 rabbit
 Perissodactyla - Hyracodontidae
Hyracodon sp. Leidy 1856 odd-toed ungulate
 Perissodactyla - Equidae
Miohippus sp. Marsh 1874 anchitheriine horse
 Ungulata - Merycoidodontidae
Merycoidodontidae indet. Cook 1912 oreodont
Leptaucheniinae indet. Schultz and Falkenbach 1940 oreodont
"LLeptauchenia sp."
 Ungulata - Protoceratidae
? Protoceras sp. Marsh 1891 protoceratid