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National Geologic Map Database

Geologic Unit: Arikaree

Usage:

Arikaree Formation (CO*,MT*,NE*,ND*,SD*,WY*)
Arikaree Sandstone (CO*,MT*,NE*,SD*,WY*)
Arikaree Group (NE*,SD,WY)


Subunits:

GROUP STATUS (alphabetical): Gering Formation (NE*,WY) or Gering Sandstone (NE*,WY), Harrison Formation (NE,SD,WY) or Harrison Sandstone (NE*), Monroe Creek Formation (NE,SD) or Monroe Creek Sandstone (NE*), Rosebud Formation (NE,SD), Turtle Butte Formation (NE).
FORMATION STATUS (alphabetical): Harrison Member (SD), Monroe Creek Member (SD).


Geologic age:

Tertiary (late Oligocene to early Miocene)*


Type section, locality, area and/or origin of name:

Name applied to formation because Arikaree Indians were at one time identified with area in which it is most largely developed (Darton, 1899).


AAPG geologic province:

Chadron arch*
Denver basin*
Powder River basin*
Sioux uplift*
Williston basin*
Wind River basin*


For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates published by U.S. Geological Survey authors.

"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).

Slash (/) indicates name does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).