Bedrock geologic map of the Nashua South quadrangle, Hillsborough County, New Hampshire, and Middlesex County, Massachusetts
Scientific Investigations Map
3200
Prepared in cooperation with the Commonwealth of Massachusetts, Massachusetts Geological Survey and the State of New Hampshire, New Hampshire Geological Survey
Links
- More information: USGS Index Page
- Document: Report
- Plate: Sim 3200 Map Sheet (pdf)
- Companion File: Companion Files
- NGMDB Index Page: National Geologic Map Database Index Page
- Download citation as: RIS | Dublin Core
Abstract
The bedrock geology of the 7.5-minute Nashua South quadrangle consists primarily of deformed Silurian metasedimentary rocks of the Berwick Formation. The metasedimentary rocks are intruded by a Late Silurian to Early Devonian diorite-gabbro suite, Devonian rocks of the Ayer Granodiorite, Devonian granitic rocks of the New Hampshire Plutonic Suite including pegmatite and the Chelmsford Granite, and Jurassic diabase dikes. The bedrock geology was mapped to study the tectonic history of the area and to provide a framework for ongoing hydrogeologic characterization of the fractured bedrock of Massachusetts and New Hampshire. This report presents mapping by G.J. Walsh and R.H. Jahns and zircon U-Pb geochronology by J.N. Aleinikoff. The complete report consists of a map, text pamphlet, and GIS database. The map and text pamphlet are only available as downloadable files (see frame at right). The GIS database is available for download in ESRITM shapefile and Google EarthTM formats, and includes contacts of bedrock geologic units, faults, outcrops, structural geologic information, photographs, and a three-dimensional model.
Suggested Citation
Walsh, G.J., Jahns, R., and Aleinikoff, J.N., 2013, Bedrock geologic map of the Nashua South quadrangle, Hillsborough County, New Hampshire, and Middlesex County, Massachusetts: U.S. Geological Survey Scientific Investigations Map 3200, Pamphlet: iv, 31 p.; 1 Plate: 29.72 x 37.38 inches; Downloads Directory, https://doi.org/10.3133/sim3200.
ISSN: 2329-132X (online)
Study Area
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Bedrock geologic map of the Nashua South quadrangle, Hillsborough County, New Hampshire, and Middlesex County, Massachusetts |
| Series title | Scientific Investigations Map |
| Series number | 3200 |
| DOI | 10.3133/sim3200 |
| Year Published | 2013 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Publisher location | Reston, VA |
| Contributing office(s) | Eastern Geology and Paleoclimate Science Center |
| Description | Pamphlet: iv, 31 p.; 1 Plate: 29.72 x 37.38 inches; Downloads Directory |
| Country | United States |
| State | Massachusetts, New Hampshire |
| County | Hillsborough County, Middlesex County |
| Other Geospatial | Nashua South quadrangle |
| Datum | 1927 North American Datum |
| Projection | Polyconic projection |
| Scale | 24000 |
| Online Only (Y/N) | Y |
| Additional Online Files (Y/N) | Y |