USGS Visual Identifier
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Geologic Unit: Nevada

No current usage.
(†Nevada Formation (NV*) or †Nevada Group (NV) abandoned.)

Devonian, Early
Devonian, Middle
Geologic Province:
Great Basin province

Areal Extent:

Type Locality:
Type section: sequence exposed at Modoc Peak, [Lat. 39 deg. 30 min. 04 sec. N., Long. 116 deg. 02 min. 29 sec. W.] Roberts Mountain quadrangle [now Whistler Mountain 15-min quadrangle], Eureka Co., NV (Merriam, 1940).

Unit Name History:
First used (King, 1876).
Named (Hague, 1883).
Described in detail (Hague, 1892).
Areal limits (Spencer, 1917).
Age modified (Kirk, 1927).
Not used (Westgate and Knopf, 1927; Hewett, 1931).
Revised; Redescribed (Merriam, 1940).
Overview (Sharp, 1942; Osmond, 1954).
Revised in Eureka area and in Sulphur Spring area (Nolan and others, 1956; Carlisle and others, 1957).
Areal limits (Johnson and Hibbard, 1957; Humphrey, 1960; Winterer and Murphy, 1960).
Overview (Osmond, 1962).
Revised (Johnson, 1962).
Age modified (Larson and Riva, 1963).
Areal limits (Merriam, 1963; Burchfiel, 1964).
Not used (Kay and Crawford, 1964).
Revised (Johnson, 1965, 1966).
Biostratigraphic dating (Johnson and others, 1968).
Revised (Murphy and Gronberg, 1970; Johnson, 1971).
Areal limits (Cornwall, 1972; Oversby, 1972).
Revised (Merriam, 1973, 1974; Nolan and others, 1974).
Areal limits (Burchfiel and others, 1974; Quinlivan and Rogers, 1974; Smith and Ketner, 1975).
Abandoned (Hose and others, 1982; Kendall and others, 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