Usage:
Ophir Formation (AZ*,CO*,NV*,NM*,UT*)
Ophir Shale (UT*)
Geologic age:
Middle Cambrian*
Type section, locality, area and/or origin of name:
Named from town of Ophir, Tooele Co., central northern UT (Loughlin, IN Lindgren and Loughlin, 1919; name credited to B.S. Butler).
AAPG geologic province:
Wasatch uplift*
Great Basin province*
San Juan basin*
Paradox basin*
Black Mesa basin*
Uinta uplift*
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 ([ ]).