Virginia Institute of Marine Science
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 dip2°–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.
Atlantic Coastal Plain; bedding; Cenozoic; Chesapeake Bay; deformation; earthquakes; Eocene
Johnson, Gerald H.; Kruse, Sarah E.; Vaughn, Allison W.; Lucey, John K.; Hobbs, C.; and Powars, David S., Postimpact deformation associated with the late Eocene Chesapeake Bay impact structure in southeastern Virginia (1998). Geology (Boulder), 26(6), 507-510.