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The Peach Bottom area in the Pennsylvania-Maryland Piedmont

By
Rodger T. Faill
Rodger T. Faill
3407 Rutherford Street, Harrisburg, Pennsylvania 17111-1850, USA
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Robert C. Smith, II
Robert C. Smith, II
22 Longview Drive, Mechanicsburg, Pennsylvania 17050, USA
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Published:
January 01, 2010

Abstract

The Appalachian Piedmont in south-central Pennsylvania and north-central Maryland contains metasedimentary siliciclastic rocks (phyllites to quartzites) that were deposited largely offshore of Laurentia, prior to and during the early history of the Iapetan Ocean. The Peach Bottom area is centered on the belt of Peach Bottom Slate and overlying Cardiff Quartzite, which is surrounded by the late Neoproterozoic and early Paleozoic rocks of the Peters Creek and Scott Creek (new name) Formations. Their provenance was the Brandywine and Baltimore microcontinents that lay farther offshore of the Laurentian coast. This area also includes an ophiolitic mélange that formed in front of an advancing island arc in Iapetus. All these rocks lay largely undisturbed throughout much of the Paleozoic, experiencing only chlorite-grade greenschist facies metamorphism through deep burial. Alleghanian thrusting associated with the growth of the Tucquan anticline imparted their present widespread, monocline, steep southeast dip of the bed-parallel foliation.

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GSA Field Guide

The Mid-Atlantic Shore to the Appalachian Highlands

Gary M. Fleeger
Gary M. Fleeger
Pennsylvania Geological Survey 3240 Schoolhouse Road Middletown, Pennsylvania 17057-3534 USA
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Steven J. Whitmeyer
Steven J. Whitmeyer
Department of Geology and Environmental Science James Madison University 800 S. Main Street, MSC 6903 Harrisonburg, Virginia 22807 USA
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Geological Society of America
Volume
16
ISBN electronic:
9780813756165
Publication date:
January 01, 2010

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