Usage:
Fourmile Canyon Formation (NV*)
Geologic age:
early Silurian*
Type section, locality, area and/or origin of name:
[Not stated.] Exposed on both sides of Fourmile Canyon, near northeast corner of Cortez 15-min quadrangle, Eureka Co., north-central NV. Crops out over area of nearly 10 sq mi in drainage areas of Fourmile and Mill Canyons, and in unnamed stream northeast of Fourmile Canyon (Gilluly and Masursky, 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 ([ ]).