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Geologic Unit: Aztec

Usage:
Aztec Sandstone (AZ?,CA,NV*)
Aztec Quartzite (CA*)
[Discrepancy concerning areal extent. See remarks under "Publication History".]

Age:
Triassic(?)*
Jurassic, Early*

Geologic Province:
Great Basin province*


Areal Extent:
AZ?
CA(se)*
NV(se)*

Type Locality:
Named from Aztec Tank, a natural depression in the sandstone several hundred ft east of Contact mine, Goodsprings quadrangle, NV (Hewett, 1931).

Unit Name History:
Named (Hewett, 1931).
Areal limits (Baker and others, 1936; Longwell, 1949; 1952; Hewett, 1956; Jennings, 1961; Barca, 1966).
Age modified (Wilson and Stewart, 1967).
Areal limits (Evans, 1971; Davis, 1973; Dunne, 1977).
Age modified; Areal limits (Stewart and Carlson, 1978).
Areal limits (Marzolf, 1980).
Age modified (Stewart, 1980; Marzolf, 1982).
Redescribed as Aztec Quartzite (Hamilton, 1982).
Age modified; Biostratigraphic dating (Reynolds, 1983).
Overview (Marzolf, 1983).
[Discrepancy in GNU records (USGS DDS-6) concerning the areal extent of Aztec Sandstone. The GNU comprehensive file GEONAMES indicates this unit extends into AZ (explanation and reference not given). Menlo GNULEX does not. Uncertain if the Aztec Sandstone is used by the Arizona Geol. Survey. --unresolved.]

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