USGS Visual Identifier
National Geologic Map Database logo GEOLEX database

Geologic Unit: Comus

Comus Formation (NV*)

Cambrian, Late*
Ordovician, Early*
Ordovician, Middle*
Geologic Province:
Great Basin province*

Areal Extent:

Type Locality:
Near Comus Station at eastern end of Emigrant Canyon, Edna Mountains, Golconda 30- by 60-min quadrangle, Humboldt Co., NV (Ferguson and others, 1952; Roberts and others, 1958).

Unit Name History:
Named (Ferguson and others, 1952).
Areal limits (Roberts, 1951; Roberts and others, 1958; Hotz and Willden, 1964).
Age modified (Hotz and Willden, 1964; Turner and others, 1989).
Biostratigraphic dating (Ethington and Repetski, 1984).

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