Abstract

New data from the Culpeper basin (Virginia) and data assembled from existing maps of other basins show that the Triassic-Jurassic border faults of eastern North America dip essentially parallel to the underlying foliation. This suggests that the faults were controlled by pre-existing planes of weakness during regional extension as Pangea broke apart. Such a mechanism does not require large-scale arching as has been advocated by others.

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