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National Geologic Map Database

Geologic Unit: Lakota

Usage:

Lakota Formation (MT*,NE*,ND*,SD*,WY*)
Lakota Sandstone (ND*)
Lakota Formation of Dakota Group (NE,ND)
Lakota Formation of Inyan Kara Group (SD*,WY*)
Lakota Sandstone of Inyan Kara Group (SD*,WY*)
[?] Lakota Formation of Cloverly Group (MT)


Subunits:

(alphabetical): Chilson Member (MT*,SD*,WY*), Fuson Member (SD*), Minnewaste Limestone Member (SD*), Pryor Member (MT).


Geologic age:

Early Cretaceous*


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

Lakota Peak, a summit on hogback range, 4 mi northwest of Hermosa, Custer Co., SD (Waage, 1959).
Reference section: in Fall River Canyon, 4 to 5 mi by road from Hot Springs, in secs. 29, 32, and 33, T. 7 S., R. 6 E., Fall River Co., SD (Waage, 1959).


AAPG geologic province:

Chadron arch*
Williston basin*
Powder 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 ([ ]).