Usage:
Island Park Rhyolite (ID*)
Subunits:
Includes the following small rhyolite domes (Christiansen, 1982): Moonshine Mountain, Silver Lake, Osborne Butte, Elk Butte, Lookout Butte, and Warm River Butte. These domes crop out within or adjacent to Henrys Fork caldera.
Geologic age:
Quaternary*
Pleistocene*
Type section, locality, area and/or origin of name:
Type area: "Arbitrarily designated" as Lookout Butte, in the Island Park area, Fremont Co., ID (Christiansen, 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 ([ ]).