USGS Visual Identifier

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Geologic Unit: Northfield

Publication:
Hatch, N.L., Jr., 1989, The Connecticut Valley Trough; Day 3, 
   IN Lyons, J.B., and others, leaders, Metamorphism and tectonics 
   of eastern and central North America; Volume 2, A transect 
   through the New England Appalachians; Burlington, Vermont to 
   Durham, New Hampshire; guidebook to field trip T162: 
   International Geological Congress, 28th, Field Trip Guidebook, 
   Washington, DC, 1989, T162, p. 39-43.
Usage in Publication:
Northfield Formation*

Modifications: Geologic Province: Dominant Lithology:
 Revised
 Areal limits
 New England province
 

Summary:
A unit of dark-gray, carbonaceous phyllite interbedded with minor thin (up to 15 cm) beds of punky-brown-weathering granulite and local thin, graded quartzite beds, which forms a narrow (0.5 to 1 km) unit along the west margin of the Connecticut Valley trough in E-C and NE Vermont, mapped as the Northfield Formation, has long been considered the basal unit of a synclinorium, underlying the Waits River Formation and equivalent to the Meetinghouse Slate on the east margin of the trough. It is here reinterpreted as a distal facies of the Gile Mountain Formation which is at the top of the Connecticut Valley trough sequence, here interpreted as a fault-bounded anticlinorium. The Meetinghouse Slate (Member of the Gile Mountain Formation of Doll and others (1961)) is also here interpreted as lying at the top of the sequence. Age is Early Devonian.
Source: GNU records (USGS DDS-6; Reston GNULEX).


Publication:
Thompson, J.B., Jr., 1990, An introduction to the geology and 
   Paleozoic history of the Glens Falls 1 degrees x 2 degrees 
   quadrangle, New York, Vermont, and New Hampshire, IN Slack, 
   J.F., ed., Summary results of the Glens Falls CUSMAP project, 
   New York, Vermont, and New Hampshire: U.S. Geological Survey 
   Bulletin, 1887-A, p. A1-A13.
Usage in Publication:
Northfield Formation*

Modifications: Geologic Province: Dominant Lithology:
 Areal limits
 New England province
 

Summary:
Rocks of Connecticut Valley-Gaspe terrane occupy a broad area in eastern half of Glens Falls quad include Northfield, Waits River, and Gile Mountain Formations.
Source: GNU records (USGS DDS-6; Reston GNULEX).


Publication:
Hueber, F.M., Bothner, W.A., Hatch, N.L., Jr., Finney, S.C., 
   and Aleinikoff, J.N., 1990, Devonian plants from southern 
   Quebec and northern New Hampshire and the age of the Connecticut 
   Valley Trough: American Journal of Science, v. 290, no. 4, 
   p. 360-395.
Usage in Publication:
Northfield Member*

Modifications: Geologic Province: Dominant Lithology:
 Biostratigraphic dating
 New England province
 

Summary:
Presence of plant fossils in northern NH and southern Quebec supports a late Early Devonian (Emsian) age for the Gile Mountain Formation and its equivalent, the Compton Formation. Gile Mountain includes the Meetinghouse Slate Member and the newly assigned Northfield Member, here considered a distal western facies of the Gile Mountain equivalent to the Meetinghouse. Authors conclude that the rocks of the Connecticut Valley trough accumulated continuously beginning as early as the Silurian and extending into the latest Early Devonian.
Source: GNU records (USGS DDS-6; Reston GNULEX).


Publication:
Hatch, N.L., Jr., 1991, Revisions to the stratigraphy of the 
   Connecticut Valley Trough in eastern Vermont, IN Stratigraphic 
   Notes, 1989-90: U.S. Geological Survey Bulletin, 1935, p. 
   5-7.
Usage in Publication:
Northfield Member*

Modifications: Geologic Province: Dominant Lithology:
 Revised
 Age modified
 New England province
 

Summary:
Structural studies in northeastern and east-central VT show that the belt long known as the Connecticut Valley synclinorium is a faulted anticline, and it is here renamed the Connecticut Valley trough. The Waits River Formation underlies the Gile Mountain Formation. The Northfield Formation and Meetinghouse Slate Member of the Gile Mountain Formation were interpreted as resting depositionally on older rocks to the west and east. The Northfield is revised as the Northfield Member of the Gile Mountain Formation, at the top of the Gile Mountain, rather than a separate formation below the Gile Mountain-Waits River package. The Meetinghouse Slate (Member of the Gile Mountain Formation of Doll and others (1961)) is revised as the Meetinghouse Slate Member of the Gile Mountain Formation, but at the top rather than at the bottom of the formation. The Standing Pond Volcanics (Standing Pond Volcanic Member of the Waits River Formation of Doll and others (1961)) is retained as the Standing Pond Volcanic Member of the Waits River. The age of all trough rocks is modified to Early Devonian.
Source: GNU records (USGS DDS-6; Reston GNULEX).


Publication:
Ratcliffe, N.M., and Armstrong, T.R., 1999, Bedrock geologic 
   map of the West Dover and Jacksonville quadrangles, Windham 
   County, Vermont: U.S. Geological Survey Miscellaneous 
   Investigations Series Map, I-2552, 30 p., 2 sheets, scale 
   1:24,000 [Available online from the USGS PubsWarehouse:  
   http://pubs.er.usgs.gov/pubs/i/i2552]
Usage in Publication:
Northfield Formation*

Modifications: Geologic Province: Dominant Lithology:
 Overview
 New England province
 

Summary:
The Northfield Formation in the West Dover and Jacksonville quadrangles, VT consists of gray to dark-gray, graphitic, garnet-chlorite-quartz-muscovite-pyrite schist and phyllite. Locally, unit includes 10 cm to 1 m thick vitreous, white-weathering, light-gray quartzite with abundant blue quartz grains. Lower part of unit is locally intruded by the Whitneyville facies of the North River Igneous Suite. The Northfield is of Silurian(?) and Devonian age.
Source: GNU records (USGS DDS-6; Reston GNULEX).