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 conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).