Bedrock Geologic Map of the Old Lyme Quadrangle, New London and Middlesex Counties, Connecticut

Walsh, Gregory J.; Scott, Robert B.; Aleinikoff, John N.; Armstrong, Thomas R.

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.

Genre:

USGS Numbered Series

ProdID:

97973

Citation Author:

Walsh, Gregory J.; Scott, Robert B.; Aleinikoff, John N.; Armstrong, Thomas R.

Citation Contributing Office:

U.S. Geological Survey

Citation Datum:

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Citation Edition:

Version 1.0, Supersedes OFR 2006-1296

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Citation Language:

ENGLISH

Citation Larger Work Title:

Citation LatN:

0412230

Citation LatS:

0411500

Citation LonE:

-0721500

Citation LonW:

-0722230

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Citation Phsyical Description:

Report: iv, 25 p.; 2 Map Sheets - Sheet 1: 46 x 28 inches, Sheet 2: 38 x 29.5 inches; Download Directory

Citation Projection:

Polyconic

Citation Public Comments:

Prepared in cooperation with the State of Connecticut, Department of Environmental Protection, Geological and Natural History Survey

Citation Publisher:

U.S. Geological Survey

Citation Series:

Scientific Investigations Map

Citation Series Code:

SIM

Citation Series Number:

3052

Citation Search Results Text:

Bedrock Geologic Map of the Old Lyme Quadrangle, New London and Middlesex Counties, Connecticut; 2009; SIM; 3052; Walsh, Gregory J.; Scott, Robert B.; Aleinikoff, John N.; Armstrong, Thomas R.

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Citation Volume:

Citation Year:

2009

Type:

citation/reference

Text:

Bedrock Geologic Map of the Old Lyme Quadrangle, New London and Middlesex Counties, Connecticut; 2009; SIM; 3052; Walsh, Gregory J.; Scott, Robert B.; Aleinikoff, John N.; Armstrong, Thomas R.