| Abstract: | The bedrock geology of the 7.5-minute Grafton, Massachusetts, quadrangle consists of deformed Neoproterozoic to early Paleozoic crystalline metamorphic and intrusive igneous rocks. Neoproterozoic intrusive, metasedimentary, and metavolcanic rocks crop out in the Avalon zone, and Cambrian to Silurian intrusive, metasedimentary, and metavolcanic rocks crop out in the Nashoba zone. Rocks of the Avalon and Nashoba zones, or terranes, are separated by the Bloody Bluff fault. 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.
This report presents mapping by G.J. Walsh, geochronology by J.N. Aleinikoff, geochemistry by M.J. Dorais, and consists of a map, text pamphlet, and GIS database. The map and text pamphlet are available in paper format or as downloadable files (see frame at right). The GIS database is available for download. The database includes contacts of bedrock geologic units, faults, outcrops, structural geologic information, and photographs. |
| Genre: | USGS Numbered Series |
| ProdID: | 70037732 |
| Citation Author: | Walsh, Gregory J.; Aleinikoff, John N.; Dorais, Michael J. |
| Citation Contributing Office: | U.S. Geological Survey |
| Citation Datum: | North American Datum 1927 |
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| Citation Language: | English |
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| Citation LatN: | 0421500 |
| Citation LatS: | 0420730 |
| Citation LonE: | -0713730 |
| Citation LonW: | -0714500 |
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| Citation Phsyical Description: | Map: 46.08 x 32.24 inches; Pamphlet: iv, 39 p.; Downloads Directory |
| Citation Projection: | Polyconic projection |
| Citation Public Comments: | Prepared in cooperation with the Commonwealth of Massachusetts, Massachusetts Geological Survey, Brigham Young University |
| Citation Publisher: | U.S. Geological Survey |
| Citation Series: | Scientific Investigations Map |
| Citation Series Code: | SIM |
| Citation Series Number: | 3171 |
| Citation Search Results Text: | Bedrock geologic map of the Grafton quadrangle, Worcester County, Massachusetts; 2011; SIM; 3171; Walsh, Gregory J.; Aleinikoff, John N.; Dorais, Michael J. |
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| Citation Year: | 2011 |
| Type: | citation/reference |
| Text: | Bedrock geologic map of the Grafton quadrangle, Worcester County, Massachusetts; 2011; SIM; 3171; Walsh, Gregory J.; Aleinikoff, John N.; Dorais, Michael J. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/sim_3171.jpg |
| URL (INDEX PAGE): | http://pubs.usgs.gov/sim/3171/ |
| Date Other: | Mon, 12 Mar 2012 00:00 -0500 |
| Publisher: | U.S. Geological Survey |
