USGS Visual Identifier
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Geologic Unit: Idavada

Idavada Volcanics (ID*,NV*)
Idavada Group (ID)

Geologic Province:
Snake River basin*
Great Basin province*
Areal Extent:

Type Locality:
Escarpment along Salmon Falls Creek, 10 mi northwest of Idavada, Twin Falls Co., ID. Named from Idavada (Malde and Powers, 1962).

GROUP STATUS (alphabetical) --all in ID: Cottonwood Creek Rhyolite, Quarry View Park Rhyodacite, Table Rock Road Rhyolite.
FORMATION STATUS (alphabetical): Beaverdam Formation (ID), Cougar Point Formation (ID,NV), Jenny Creek Formation (ID,NV).

Unit Name History:
Named (Malde and Powers, 1962).
Revised (Axelrod, 1964; Bushnell, 1967).
Isotopic dating (Armstrong and others, 1975).
Not used (Bonnichsen and Jenks, 1990).

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
Database project personnel
Last modified: 15-Jan-2013