Usage:
Sunnyside tuff (informal) in Challis Volcanics (ID)
Sunnyside rhyolite (informal) in Challis Volcanics (ID)
Sunnyside tuff (informal) of Challis Volcanic Group (ID)
Informal. The rank or lithologic term should not be capitalized. [Challis Volcanic Group adopted by the ID and MT Geol. Surveys, and the USGS (rules suspended).]
Geologic age:
Tertiary
Eocene
Type section, locality, area and/or origin of name:
Not synopsized to date.
AAPG geologic province:
Idaho Mountains 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 ([ ]).