USGS Visual Identifier
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Geologic Unit: Grandfather Mountain

Grandfather Mountain Formation of Crossnore Complex (NC*)
Grandfather Mountain Formation (NC)

Proterozoic, Late*
Geologic Province:
Piedmont-Blue Ridge province*

Areal Extent:

Type Locality:
Grandfather Mountain, Avery Co., north-central NC (Bryant, 1962).

Montezuma Member (NC*); numerous informal conglomerate units (see Neton and Raymond, 1995).

Unit Name History:
Named (Bryant, 1962).
Age modified; Isotopic dating (Rankin and others, 1969).
Areal limits; Overview (Rankin and others, 1972).
Revised; Overview (Rankin and others, 1973).
Age modified (Hack, 1982).
Age modified; Overview (Brown and others, 1985).
Revised; Overview (Goldsmith and others, 1988).
Revised (Neton and Raymond, 1995).

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