Bedrock Geologic Map of the Bellows Falls 7.5- x 15-Minute Quadrangle, Windham and Windsor Counties, Vermont, and Sullivan and Cheshire Counties, New Hampshire
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- Sheets:
- Data Release: USGS data release - Database for the bedrock geologic map of the Bellows Falls 7.5- x 15-Minute Quadrangle, Windham and Windsor Counties, Vermont, and Sullivan and Cheshire Counties, New Hampshire
- NGMDB Index Page: National Geologic Map Database Index Page (html)
- Download citation as: RIS | Dublin Core
Introduction
The bedrock geology of the Bellows Falls 7.5- x 15-minute quadrangle, Vermont and New Hampshire, consists of polydeformed Ordovician to Devonian metasedimentary, metavolcanic, and metaplutonic rocks of the Connecticut Valley trough, Bronson Hill anticlinorium (or Bronson Hill terrane), and the Central Maine terrane. Previous work in this area includes a 1:62,500-scale published map and text (1946), State geologic maps of New Hampshire (1997) and Vermont (2011), and various maps and reports presented largely as parts of field trip guidebooks. A provisional open-file map of the geology of the Vermont part of the Bellows Falls 7.5- x 15-minute quadrangle, completed in 1997, is incorporated and revised on this map based on additional fieldwork.
This study recognizes three major structural levels from west to east and from lowest to highest: (1) autochthonous rocks of the Connecticut Valley trough; (2) allochthonous rocks of the New Hampshire sequence and Bronson Hill arc in the Monroe thrust sheet (or nappe), including the Skitchewaug nappe; and (3) allochthonous rocks of the Fall Mountain thrust sheet or nappe.
Suggested Citation
Merschat, A.J., Walsh, G.J., Valley, P.M., McAleer, R.J., and Armstrong, T.R., 2025, Bedrock geologic map of the Bellows Falls 7.5- x 15-minute quadrangle, Windham and Windsor Counties, Vermont, and Sullivan and Cheshire Counties, New Hampshire: U.S. Geological Survey Scientific Investigations Map 3535, 2 sheets, scale 1:24,000, https://doi.org/10.3133/sim3535.
ISSN: 2329-132X (online)
Study Area
Table of Contents
- Description of Map Units
- Explanation of Map Symbols
- Discussion
- References Cited
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Bedrock geologic map of the Bellows Falls 7.5- x 15-minute quadrangle, Windham and Windsor Counties, Vermont, and Sullivan and Cheshire Counties, New Hampshire |
| Series title | Scientific Investigations Map |
| Series number | 3535 |
| DOI | 10.3133/sim3535 |
| Publication Date | May 21, 2025 |
| Year Published | 2025 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Publisher location | Reston, VA |
| Contributing office(s) | Florence Bascom Geoscience Center |
| Description | 2 Sheets: 57.26 x 41.62 inches and 61.56 x 35.74 inches; Data Release |
| Country | United States |
| State | New Hampshire, Vermont |
| County | Cheshire County, Sullivan County, Windham County, Windsor County |
| Other Geospatial | Bellows Falls 7.5- x 15-minute quadrangle |
| Online Only (Y/N) | Y |
| Additional Online Files (Y/N) | N |