USGS Visual Identifier
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Geologic Unit: Northfield

Usage:
Northfield Member of Gile Mountain Formation (VT*)
Northfield Formation (VT*)
Northfield Slate (VT)

Age:
Silurian(?)*
Devonian, Early*
Geologic Province:
New England province*

Areal Extent:
VT*


Type Locality:
Village of Northfield, Barre quadrangle, Washington Co., VT, near which slate was quarried (Richardson, 1906).

Unit Name History:
Named (Richardson, 1906) [From GNU records (USGS DDS-6; Reston GNULEX); complete bibliographic citation and synopsis not given].
Revised (Currier and Jahns, 1941) [From GNU records (USGS DDS-6; Reston GNULEX); complete bibliographic citation and synopsis not given].
VT State Geol. Map usage (Doll and others, 1961) [From GNU records (USGS DDS-6; Reston GNULEX); complete bibliographic citation and synopsis not given].
Revised, restricted from east-central and northeast VT (Hatch, 1989).
Areal limits (Thompson, 1990).
Revised to member of Gile Mountain Formation; Age modified (Hueber and others, 1990; Hatch, 1991).
Overview (Ratcliffe and Armstrong, in press).

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