Usage:
Rough Mountain rhyolite [informal] (ID*)
Considered informal. The rank or lithologic term should not be capitalized.
Geologic age:
Tertiary*
Miocene*
Type section, locality, area and/or origin of name:
Not designated. Named (informally?) for hill (6821 ft elevation) just west of Sheep Creek canyon, [Indian Hay Meadows 7.5-min quadrangle] Owyhee Co., ID (Bernt and Bonnichsen, 1982).
AAPG geologic province:
Snake River basin*
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 ([ ]).