Colorado River Basin Stratigraphy

Pioche Shale

Usage of Geologic Unit Name:
Pioche Formation (NV*,UT*)
Pioche Shale (CA*,NV*,UT*)

Cambrian, Early*
Cambrian, Middle*

Great Basin province*

CA*
NV(ec)*
UT(wc)*

Type Locality:
Named for exposures southeast of the town of Pioche, NV on road to Panaca, UT, Pioche district, NV (Walcott, 1908).

Subunits:
(alphabetical): Combined Metals Member (NV*), Susan Duster Limestone Member (NV*), Tatow Member (UT*).

Unit Name History:
Named (Walcott, 1908). Divided into unnamed lower member and Tatow Member; Redescribed (Hintze and Robison, 1975).

Walcott, C.D., 1908, Cambrian geology and paleontology, I; No. 1, Nomenclature of some Cambrian Cordilleran formations: Smithsonian Miscellaneous Collections, v. 53, p. 1-12.

Hintze, L.H. and Robison, R.A., 1975, Middle Cambrian stratigraphy of the House, Wah Wah, and adjacent ranges in western Utah: Geological Society of America Bulletin, v. 86, no. 7, p. 881-891.

* show accepted USGS usage. Note that data on this page is modified from information available via the National Geologic Map Database GEOLEX: http://ngmdb.usgs.gov/Geolex/geolex_qs.html.