Trellis drainage pattern in the Valley & Ridge at the headwaters of the James, Potomac, and Ohio river systems in northwestern Virginia and eastern West Virginia.
Trellis Drainage Pattern
August 3, 2016 by ·
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Hylas Zone Mylonite
This micrograph illustrates a mylonite from the Hylas Zone in the eastern Piedmont ~5 km west of Doswell, Virginia. The rock is characterized by a well-developed foliation with elongate quartz ribbons (transparent grains) and feldspar porphyroclasts. The rock originally was a granodiorite that was strongly deformed and sheared, under ductile conditions, into a mylonite. Checkout […]
What’s New in Virginia Geology
Virginia’s State Rock: Nelsonite
On July 1, 2016, Governor Terry McCauliffe signed a bill into law that made nelsonite the first official state rock of Virginia. The initiative for this project was led by students from Piedmont Virginia Community College. Michelle Stanislaus and her classmates from their Historical Geology class and Government class ran the petition for this law starting […]