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Excerpt from The Chopawamsic Formation, a New Stratigraphic Unit in the Piedmont of Northeastern Virginia The contact of the Chopawamsic Formation with the overlying Quantico Slate is gradational. Contact relations are well exposed along the north shore of the reservoir on Aquia Creek (reference section There the black graphitic Quantico Slate contains scattered 1 to 6-inch-thick graded sandy and silty (tuffaceous?) layers that indicate top of beds is to the southeast. About 100 feet above the base of the slate is a 100-foot-thick unit of medium to fine-grained schistose felsic tuff. This rock is strongly cleaved and recrystallized, but contains flattened angular fragments, prob ably lapilli. The schistose tuff occurs in beds as much as 20 feet thick interlayered with very finely interlaminated gray metasiltstone and black slate. The tuffaceous unit probably was deposited from submarine pyro clastic ash flows. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.

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