By Avery A. Drake(auth.)
About The Product
Published by means of the yankee Geophysical Union as a part of the Field journey Guidebooks Series.
The metamorphic rocks of the Potomac Valley, uncovered among the Culpeper Mesozoic basin and Laurentian rocks at the west and the Atlantic Coastal undeniable overlap at the east, represent the internides of this a part of the crucial Appalachian orogen. those rocks take place in a stack of thrust sheets (Drake, 1980, 1983, 1985a, 1985b, 1985c, 1986a, 1986b, 1986c, 1987; Drake and Froelich, 1986; Drake and Lee, in press; Drake and Lyttle, 1981; Drake and Morgan, 1981, 1983; Drake and others, in press; and Drake and others, 1979), that's suggestion consequence from an amalgamation of terrane fragments right into a Potomac composite terrane (Drake, 1983, 1985b, 1987; Horton and Drake, 1986; Horton and others, 1987, in press). The age of those rocks is doubtful simply because they're unfossiliferous, yet they're in all likelihood pre-Arenig (Drake, 1986b; Drake and others, in press; Rankin and others, in press). these in northern Virginia, and without delay alongside strike in Maryland, are older than the Occoquan Granite which has been dated at 560 Ma by way of U-Pb strategies on zircons (Seiders and others, 1975) and at 494 ± 14 Ma by way of Rb-Sr wholerock recommendations (Mose and Nagel, 1982). I think about those rocks to variety in age from past due Proterozoic to Cambrian.
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