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The early through late Pleistocene record in the Susquehanna River Basin

By
Duane D. Braun
Duane D. Braun
Emeritus, Department of Geography and Geosciences, Bloomsburg University, Bloomsburg, Pennsylvania, 17815, USA
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Published:
January 01, 2010

Abstract

A transect of the Coastal Plain, Piedmont, Ridge and Valley, and Appalachian Plateau physiographic provinces valley will be made by going up the Susquehanna Valley. Early to late Pleistocene features will be examined at eleven sites. The pre-Pleistocene evolution of the Appalachian landscape will also be discussed at two sites. The journey will start on the Coastal Plain and travel to the lower Susquehanna bedrock gorge across the High Piedmont, where strath terraces will be examined. From there the Susquehanna River will be followed upstream to the Low Piedmont where broad outwash terraces, of early to late Pleistocene-age, flank the River. Continuing up-river into Ridge and Valley Province, the water gaps at Harrisburg, Pennsylvania, will be viewed and their origin discussed. The Susquehanna River will be followed across the remainder of the Ridge and Valley with stops to view early and mid-Pleistocene-aged features. Emphasis will be placed on the amount of erosion that has occurred since the early Pleistocene and the development of a pseudo-moraine landscape. At the wind gap through Bald Eagle Mountain, the mid-Miocene to present evolution of the overall Appalachian landscape will be discussed. The evidence for the early Pleistocene-age for Glacial Lake Lesley will be examined in the West Branch Susquehanna valley. In the deep valleys section of the Appalachian Plateau, the mid- and late Pleistocene glacial termini will be examined. Turning south into the Ridge and Valley, the trip will conclude with examination of glaciofluvial deposits of probable mid-Pleistocene-age.

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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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