USGS Visual Identifier
National Geologic Map Database logo GEOLEX database

Geologic Unit: Mount Holly

Mount Holly Complex (MA*,VT*)

Proterozoic, Middle*
Geologic Province:
New England province*

Areal Extent:

Type Locality:
Mount Holly Twp., Rutland Co., VT (Whittle, 1894).

College Hill Granite Gneiss (VT*), Wilcox Formation (VT*), Cavendish Formation (VT*).

Unit Name History:
Named Mount Holly series (Whittle, 1894).
Renamed Mount Holly gneiss (Prindle and Knopf, 1932).
Renamed Mount Holly Complex (Osberg, 1952).
Isotopic dating (Karabinos and Aleinikoff, 1990).
Revised, member named; Areal limits (Ratcliffe, 1991).
Revised to include Wilcox Formation (Ratcliffe, 1994).
Isotopic dating; Overview (Ratcliffe, in press).
Revised to include Cavendish Formation (Ratcliffe, in press).
[When referring to the Mount Holly series of Whittle (1894), please use informally. The practice of employing "series" for lithostratigraphic or lithodemic nomenclature is now regarded as improper (see ACSN, 1961, 1970; NACSN, 1983). The term "Series" is applied formally only to chronostratigraphic units.]

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