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By Gary Mark Fleeger, Steven J. Whitmeyer

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Extra info for The Mid-Atlantic shore to the Appalachian highlands: field trip guidebook for the 2010 joint meeting of the Northeastern and Southeastern GSA Sections (GSA Field Guide 16)

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The flow was probably short-lived because no quartz-muscovite-chlorite schists were observed within the metabasalt sequence. The top of the metabasalt is overlain by a medium gray, very fissile muscovite-chlorite-quartz phyllite. Dissolved vugs indicate that the metabasalt did have considerable calcite and/ or dolomite, produced by deuteric alteration from fluids (meteoric fluids (mostly) and magmatic fluids), which entered the flow early (while still hot). The Fishing Creek Metabasalt is pervaded by a welldeveloped foliation, S1, which parallels the layering and laminations.

Farther north across the Rapidan River, the Culpeper Basin contains numerous mafic igneous intrusions and several basaltic lava flows. ” These intrusions serve as the major sources of crushed stone in northern Virginia. In some cases, contact metamorphism caused by the intrusions result in zones of hornfels extending as much as hundreds of meters into the surrounding sedimentary rocks. REGIONAL SOILS The “diversity and complexity of the geology in central Virginia are accompanied by an equally diverse and complex mantle of residual soils” (Plaster and Sherwood, 1971, p.

2, p. 86–87. , 1941, Geology of the “Martic overthrust” and the Glenarm Series in Pennsylvania and Maryland: Geological Society of America Special Paper 35, 207 p. , 1990, U/Pb zircon and baddeleyite ages for the Palisades and Gettysburg sills of the northeastern United States: Implications for the age of the Triassic/Jurassic boundary: Geology, v. 18, p. CO;2. , 1986, Geologic map of the Union Bridge quadrangle, Carroll and Frederick Counties, Maryland: Maryland Geological Survey Atlas. , 1988, Geologic map of the Woodsboro Quadrangle, Carroll and Frederick Counties, Maryland: Maryland Geological Survey Atlas.

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