Usage:
Ervay Limestone Member of Goose Egg Formation (WY*)
Ervay Limestone Member of Park City Formation (WY*)
Geologic age:
middle Permian (Guadalupian; Wordian)*
Type section, locality, area and/or origin of name:
Type section: on Casper Creek in the Rattlesnake Hills, Natrona Co., WY. Named from Ervay Post Office, north end Rattlesnake Hills, Natrona Co., WY (Thomas, 1934).
AAPG geologic province:
Bighorn basin*
Green River 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 ([ ]).