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 [Belt Park Butte] in Belt Park, in sec. 15, T. 14 N., R. 7 E., [approx. Lat. 46 deg. 58 min. N., Long. 110 deg. 49 min. 24 sec. W., Belt Park Butte 7.5-min quadrangle, Lewis and Clark National Forest], 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 conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).