Usage:
Park Shale (ID*,MT*,WY*)
Park Shale Member of Gros Ventre Formation (ID,WY*)
Geologic age:
Cambrian, Middle*
Cambrian, Late
Type section, locality, area and/or origin of name:
Type section: Dry Wolf Creek, in sec. 14, T. 14 N., R. 9 E., Judith Basin Co., MT (Deiss, 1936).
AAPG geologic province:
Bighorn basin
Central Montana uplift
Green River basin
Montana folded belt*
Snake River basin*
Sweetgrass arch*
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 ([ ]).