Usage:
White River Group (CO*,MT*,NE*,ND*,SD*,WY*)
White River Formation (CO*,MT,NE*,SD*,WY*)
Subunits:
GROUP STATUS (alphabetical): Brule Clay (NE) or Brule Formation (CO*,MT*,NE*,ND*,SD*,WY*), Castle Rock Conglomerate (CO*), Chadron Formation (CO*,MT*,NE*,ND*,SD*,WY*), Chamberlain Pass Formation (SD), Little White River Formation (SD), /Sweetwater Member (WY).
FORMATION STATUS (alphabetical): Beaver Divide Conglomerate Member (WY*), Big Sand Draw Sandstone Lentil (WY*), Cedar Creek Member (CO), Horsetail Creek Member (CO), Vista Member (CO).
Geologic age:
early Tertiary (Eocene to Oligocene; Chadronian to Whitneyan NALMA)*
Type section, locality, area and/or origin of name:
Named from occurrence near mouth of White River, SD. Deposits in places crown summits of hills on east side of the Missouri [River] near mouth of White River (Meek and Hayden, 1858; 1862).
AAPG geologic province:
Chadron arch*
Denver 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 ([ ]).