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National Geologic Map Database

Geologic Unit: Pioche

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 does not conform with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005). This may be explained within brackets ([ ]).