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Postimpact deformation associated with the late Eocene Chesapeake Bay impact structure in southeastern Virginia
Johnson, Gerald H. Kruse, Sarah E. Vaughn, Allison W. Lucey, John K. Hobbs, C. Powars, David S
Johnson, Gerald H.
Kruse, Sarah E.
Vaughn, Allison W.
Lucey, John K.
Hobbs, C.
Powars, David S
Abstract
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.
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1998-06-01
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i0091_7613_26_6_507.pdf
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Physical Sciences Peer-Reviewed Articles, Atlantic Coastal Plain; bedding; Cenozoic; Chesapeake Bay; deformation; earthquakes; Eocene
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Virginia Institute of Marine Science
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https://doi.org/10.1130/0091-7613(1998)026 2.3.CO;2