Usage:
Grouse Mountain Basalt (CO*)
Geologic age:
Miocene*
Type section, locality, area and/or origin of name:
At Grouse Mountain, in NE/4 sec. 18, T. 2 N., R. 78 W., Hot Sulphur Springs quadrangle, Grand Co., northwestern CO. Named from Grouse Mountain (Izett, 1966).
AAPG geologic province:
North Park 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 ([ ]).