USGS Visual Identifier
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Geologic Unit: Sunnyside

Sunnyside tuff (informal) of Challis Volcanics (ID)
Sunnyside tuff (informal) of /Challis Volcanic Group (ID)
Sunnyside rhyolite (informal) of Challis Volcanics (ID)
Informal. The rank or lithologic term should not be capitalized.
[A group [or supergroup] name combines a geographic name with the term "group," [or “supergroup,”] and no lithic designation is included (ACSN, 1961, 1970; NACSN, 1983).]

Geologic Province:
Idaho Mountains province

Areal Extent:

Type Locality:
Not synopsized to date.

Unit Name History:
Name proposed for an informal unit in Challis Volcanics (Shannon and Reynolds, 1975) [From GNU records (USGS DDS-6; Denver GNULEX); complete bibliographic citation and synopsis not given].
Areal limits; Applied as an informal unit in /Challis Volcanic Group to rocks in Thunder Mountain cauldron complex (Fisher and others, 1992).

Note: If you need more information, please contact Nancy Stamm (
Asterisks (*) indicate usage by the U.S. Geological Survey. Other usages by state geological surveys.

"No current usage" implies that a name has been abandoned or that it has fallen into disuse. Former usage and, if known, replacement name given in parentheses ().

Slashes (/) indicate unit name usage violates the 1983 North American Stratigraphic Code. This violation may be explained within brackets ([ ]).

U.S. Department of the Interior, U.S. Geological Survey, Reston, VA, USA
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Last modified: 15-Jan-2013