Usage:
Pioche Formation (NV*,UT*)
Pioche Shale (CA*,NV*,UT*)
Subunits:
(alphabetical): Busby Quartzite Member (UT*), Cabin Shale Member (UT*), Combined Metals Member (NV*), Susan Duster Limestone Member (NV*), Tatow Member (UT*).
Geologic age:
late Early to early Middle Cambrian*
Type section, locality, area and/or origin of name:
Type locality: southeast of Pioche, on road to Panaca, [Pioche quadrangle, Lincoln Co., western NV] (Walcott, 1908).
AAPG geologic province:
Great Basin 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 ([ ]).