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Postimpact deformation associated with the late Eocene Chesapeake Bay impact structure in southeastern Virginia

¹ Department of Geology, College of William and Mary, Williamsburg, Virginia 23187
² Department of Geology, University of South Florida, Tampa, Florida 33620
³ Virginia Institute of Marine Science, Gloucester Point, Virginia 23062
⁴ Water Resources Division, U.S. Geological Survey, Baltimore, Maryland 21237

Upper Cenozoic strata covering the Chesapeake Bay impact structure in southeastern Virginia record intermittent differential movement around its buried rim. Miocene strata in a graben detected by seismic surveys on the York River exhibit variable thickness and are deformed above the crater rim. Fan-like interformational and intraformational angular unconformities within Pliocene–Pleistocene strata, which strike parallel to the crater rim and dip 2°–3° away from the crater center, indicate that deformation and deposition were synchronous. Concentric, large-scale crossbedded, bioclastic sand bodies of Pliocene age within 20 km of the buried crater rim formed on offshore shoals, presumably as subsiding listric slump blocks rotated near the crater rim.

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