Abstract

Paleomagnetic studies of folded Ordovician and Silurian red beds from the Valley and Ridge province of Virginia to Pennsylvania reveal secondary magnetizations that postdate the folding. The pole position for these secondary magnetizations is statistically different from all North American poles younger than Early Permian. Further comparison with the apparent polar wander path of cratonic North America implies that the Alleghenian folding in the Central Appalachians is at least as old as Early Permian and is probably of Late Carboniferous age.

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