USGS Visual Identifier
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Geologic Unit: Roberts Mountains

Roberts Mountains Formation*

Silurian, Early*
Silurian, middle*
Devonian, Early*
Geologic Province:
Snake River basin*
Great Basin province*
Idaho Mountains province

Areal Extent:

Type Locality:
Type section is located on the west side of Roberts Creek Mountain [Roberts Creek Mountain 7.5-min quadrangle, Eureka Co], NV (Merriam, 1940).

Unit Name History:
Named (Merriam, 1940). Adopted (Nolan and others, 1956). Redescribed (Nolan and others, 1956). Biostratigraphic dating (Merriam, 1940; Radtke, 1985). Overview (Skipp and Sandberg, 1975). Age modified (Skipp and Sandberg, 1975). Areal limits; Extended into ID (Skipp, Sandberg, 1975). Overview (Skipp, Sandberg, 1975; Dover, 1983). Age modified (Dover, 1983).

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