Usage:
Brock Canyon Formation (NV*)
Geologic age:
Late Pennsylvanian or early Permian*
Type section, locality, area and/or origin of name:
Type section: in upper part of Cottonwood Canyon, Frenchie Creek and Horse Creek Valley 15-min quadrangles, Eureka Co., NV (Muffler, 1964).
Supplementary section 1: east side of Brock Canyon near the mouth from E. 245,700, N. 2,015,200 to E. 247,450, N. 2,014,450, Frenchie Creek 15-min quadrangle, Eureka Co., NV (Muffler, 1964).
Supplementary section 2: west side of Brock Canyon near the mouth from E. 245,450, N. 2,012,800 to E. 244,500, N. 2,012,250, [border Crescent Valley and Frenchie Creek 15-min quadrangles], Eureka Co., NV (Muffler, 1964).
Named from exposures in Brock Canyon on northwest face of Cortez Mountains in and east of southeast corner of Crescent Valley 15-min quadrangle, Eureka Co., NV (Gilluly and Gates, 1965).
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 ([ ]).