GEOLEX database Geologic Unit: Nevada Usage: No current usage. (†Nevada Formation (NV*) or †Nevada Group (NV) abandoned.) Age: Devonian, Early Devonian, Middle Geologic Province: Great Basin province Areal Extent: NV(ec) 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 (nstamm@usgs.gov). 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 URL http://ngmdb.usgs.gov/ngmdb/ngm_catalog.ora.html Database project personnel Last modified: 15-Jan-2013