Gerald H. Johnson, Sarah E. Kruse, Allison W. Vaughn, John K. Lucey, Carl H. Hobbs, III, David S. Powars; Postimpact deformation associated with the late Eocene Chesapeake Bay impact structure in southeastern Virginia. Geology ; 26 (6): 507–510. doi: https://doi.org/10.1130/0091-7613(1998)026<0507:PDAWTL>2.3.CO;2
Download citation file:
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.