U.S. Geological Survey Home AASG Logo USGS HOME CONTACT USGS SEARCH USGS
National Geologic Map Database
Map showing publication footprint
  • Usage in publication:
    • Harlow Bridge quartzite member
  • Modifications:
    • Named
  • Dominant lithology:
    • Quartzite
    • Schist
  • AAPG geologic province:
    • New England province
Publication:

Currier, L.W., and Jahns, R.H., 1941, Ordovician stratigraphy of central Vermont: Geological Society of America Bulletin, v. 52, no. 9, p. 1487-1512.


Summary:

Named the Harlow Bridge quartzite member of the Cram Hill formation for Harlow Bridge railroad bridge, near Northfield, Washington Co., central VT. Consists of buff to pale-green platy to massive quartzite beds with intercalated siliceous schists. Unit is basal member of formation. Thickness is approximately 300 to 800 feet. Overlies unnamed Ordovician(?) schists. The Harlow Bridge is of Middle Ordovician age.

Source: GNU records (USGS DDS-6; Reston GNULEX).


Map showing publication footprint
  • Usage in publication:
    • Harlow Bridge quartzite member
  • Modifications:
    • Revised
  • AAPG geologic province:
    • New England province
Publication:

Doll, C.G., Cady, W.M., Thompson, J.B., Jr., and Billings, M.P., 1961, Centennial geologic map of Vermont: Vermont Geological Survey, scale 1:250,000


Summary:

Revised the Harlow Bridge quartzite member as part of the Missisquoi formation since the Cram Hill was reduced in rank as part of the Missisquoi. The Harlow Bridge consists of buff to pale-green quartzite interbedded with quartz-sericite-chlorite phyllite. Overlies the Moretown member and underlies the Cram Hill member.

Source: GNU records (USGS DDS-6; Reston GNULEX).


Map showing publication footprint
  • Usage in publication:
    • Harlow Bridge Quartzite
  • Modifications:
    • Revised
  • AAPG geologic province:
    • New England province
Publication:

Westerman, D.S., 1987, Structures in the Dog River fault zone between Northfield and Montpelier, Vermont; Trip A-6, IN Westerman, D.S., ed., Guidebook for field trips in Vermont; Volume 2: New England Intercollegiate Geological Conference Guidebook, 79th annual meeting, Montpelier, VT, October 16-18, 1987, p. 109-132.


Summary:

Raised the rank of the Harlow Bridge to the Harlow Bridge Quartzite through remapping of members of the Missisquoi Formation of Doll and others (1961). Consists of massive, buff-weathering beds of pale green quartzite that contains interbeds of green-gray phyllite. Unit is in fault contact with the Dog River and Moretown Formations.

Source: GNU records (USGS DDS-6; Reston GNULEX).


Search archives

For more information, please contact Nancy Stamm, Geologic Names Committee Secretary.

Asterisk (*) indicates published by U.S. Geological Survey authors.

"No current usage" (†) implies that a name has been abandoned or has fallen into disuse. Former usage and, if known, replacement name given in parentheses ( ).

Slash (/) indicates name conflicts with nomenclatural guidelines (CSN, 1933; ACSN, 1961, 1970; NACSN, 1983, 2005, 2021). May be explained within brackets ([ ]).

Accessibility FOIA Privacy Policies and Notices

USA Gov U.S. Department of the Interior | U.S. Geological Survey
Supported by the National Cooperative Geologic Mapping Program
Page Contact Information: Personnel
Page Last Modified: Thu 04 Apr 2024 03:21:46 PM MDT