The Mid-Atlantic Shore to the Appalachian Highlands: Field Trip Guidebook for the 2010 Joint Meeting of the Northeastern and Southeastern GSA Sections

This guidebook features field trips offered during the joint meeting of GSA’s Northeastern and Southeastern Sections held in Baltimore, Maryland, in March 2010. Chapters in this guide reflect the meeting’s theme (“Linking North and South: Exploring the Connections between Continent and Sea”) in that they span the lowlands of eastern Pennsylvania to the highlands of northeastern West Virginia. Four physiographic provinces are covered: Piedmont (Piedmont Upland and Gettysburg-Newark Lowland Sections), Blue Ridge, Valley and Ridge, and Appalachian Plateau. The geologic foci are likewise variable, ranging from Precambrian basement rocks to Pleistocene sediments.
Soils, geomorphology, landscape evolution, and land use in the Virginia Piedmont and Blue Ridge
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Published:January 01, 2010
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CiteCitation
W. Cullen Sherwood, Anthony S. Hartshorn, L. Scott Eaton, 2010. "Soils, geomorphology, landscape evolution, and land use in the Virginia Piedmont and Blue Ridge", The Mid-Atlantic Shore to the Appalachian Highlands: Field Trip Guidebook for the 2010 Joint Meeting of the Northeastern and Southeastern GSA Sections, Gary M. Fleeger, Steven J. Whitmeyer
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Abstract
The object of this field trip is to examine the geology, landforms, soils, and land use in the eastern Blue Ridge and western Piedmont geologic provinces in Orange County in central Virginia. A complex mix of igneous, sedimentary, and metamorphic bedrocks, ranging in age from Mesoproterozoic to Triassic (possibly some Jurassic) underlie the area. Soils are equally varied with a total of 62 series mapped in Orange County alone. The area being relatively stable tectonically, landforms generally reflect the resistance to weathering of the bedrock. Area landforms range from a low ridge over Catoctin greenstone to a gently rolling Triassic basin. Soils examined on the trip represent three orders: Ultisols, Alfisols, and Inceptisols. Residual soils clearly reflect the compositions of the parent rocks and saprolites are common. Map patterns of forested versus nonforested lands bear a striking resemblance to the distribution patterns of the different soil and bedrock types. Our work has shown that the vast majority of the land in central Virginia, even that forested today, shows evidence of past clearing and cultivation. However, the harsh demands of growing tobacco wore out the less fertile and more erodible soils by the mid-nineteenth century resulting in their abandonment and the subsequent regeneration of the vast tracts of hardwood forests we see today. Only the most productive soils remain in agriculture.
- Appalachians
- areal geology
- bedrock
- Blue Ridge Province
- field trips
- forests
- geomorphology
- guidebook
- human activity
- igneous rocks
- land use
- landform evolution
- landscapes
- metamorphic rocks
- North America
- Orange County Virginia
- Piedmont
- road log
- saprolite
- sedimentary rocks
- soils
- United States
- Virginia
- weathering