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National Geologic Map Database

Geologic Unit: Wolsey

Usage:

Wolsey Shale (MT*,WY*)
Wolsey Formation (MT*,WY*)
Wolsey Shale Member of Gros Ventre Formation (MT,WY*)


Geologic age:

Middle Cambrian*


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

Type locality at old dam on Sheep Creek near Wolsey, Meagher Co., MT [rocks now covered]. Took name Wolsey from post office of that name at a ranch on Sheep Creek, near Wolsey, Meagher Co., MT [post office no longer in existence] (Weed, 1900).
Type section (emended): on south end of South Hill in Belt Park, in sec. 15, T. 14 N., R. 7 E., Cascade Co., MT (Deiss, 1936).


AAPG geologic province:

Bighorn basin
Central Montana uplift
Montana folded belt*
Sweetgrass arch*
Williston basin
Wind River basin
Yellowstone province


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 ([ ]).