Bedrock geologic map of the Old Lyme quadrangle, New London and Middlesex Counties, Connecticut
Scientific Investigations Map
3052
Prepared in cooperation with the State of Connecticut, Department of Environmental Protection, Geological and Natural History Survey
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Abstract
The bedrock geology of the Old Lyme quadrangle consists of Neoproterozoic and Permian gneisses and granites of the Gander and Avalon terranes, Silurian metasedimentary rocks of the Merrimack terrane, and Silurian to Devonian metasedimentary rocks of uncertain origin. The Avalon terrane rocks crop out within the Selden Neck block, and the Gander terrane rocks crop out within the Lyme dome. The Silurian to Devonian rocks crop out between these two massifs.
Previous mapping in the Old Lyme quadrangle includes the work by Lawrence Lundgren, Jr. Lundgren's work provides an excellent resource for rock descriptions and detailed modal analyses of rock units that will not be duplicated in this current report. New research that was not covered in detail by Lundgren is the focus of this report and includes (1) evaluation of the rocks in the core of the Lyme dome in an effort to subdivide units in this area; (2) structural analysis of foliations and folds in and around the Lyme dome; (3) geochronology of selected units within the Lyme dome; and (4) analysis of joints and the fracture properties of the rocks.
Suggested Citation
Walsh, G.J., Scott, R.B., Aleinikoff, J.N., and Armstrong, T.R., 2009, Bedrock geologic map of the Old Lyme quadrangle, New London and Middlesex Counties, Connecticut (Version 1.0, Supersedes OFR 2006-1296): U.S. Geological Survey Scientific Investigations Map 3052, Report: iv, 25 p.; 2 Plates: 46 x 28 inches and 38 x 29.5 inches; Download Directory, https://doi.org/10.3133/sim3052.
ISSN: 2329-132X (online)
Study Area
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Bedrock geologic map of the Old Lyme quadrangle, New London and Middlesex Counties, Connecticut |
| Series title | Scientific Investigations Map |
| Series number | 3052 |
| DOI | 10.3133/sim3052 |
| Edition | Version 1.0, Supersedes OFR 2006-1296 |
| Year Published | 2009 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Contributing office(s) | U.S. Geological Survey |
| Description | Report: iv, 25 p.; 2 Plates: 46 x 28 inches and 38 x 29.5 inches; Download Directory |
| Country | United States |
| State | Connecticut |
| County | Middlesex County, New London County |
| Other Geospatial | Old Lyme quadrangle |
| Projection | Polyconic |
| Scale | 24000 |
| Online Only (Y/N) | Y |
| Additional Online Files (Y/N) | Y |