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Geologic columns for the ICDP-USGS Eyreville A and C cores, Chesapeake Bay impact structure: Postimpact sediments, 444 to 0 m depth

By
L.E. Edwards
L.E. Edwards
U.S. Geological Survey, 926A National Center, Reston, Virginia 20192, USA
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D.S. Powars
D.S. Powars
U.S. Geological Survey, 926A National Center, Reston, Virginia 20192, USA
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J.V. Browning
J.V. Browning
Department of Earth and Planetary Sciences, Rutgers University, Piscataway, New Jersey 08854, USA
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P.P. McLaughlin, Jr.
P.P. McLaughlin, Jr.
Delaware Geological Survey, University of Delaware, DGS Building, 257 Academy Street, Newark, Delaware 19716, USA
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K.G. Miller
K.G. Miller
Department of Earth and Planetary Sciences, Rutgers University, Piscataway, New Jersey 08854, USA
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J.M. Self-Trail
J.M. Self-Trail
U.S. Geological Survey, 926A National Center, Reston, Virginia 20192, USA
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A.A. Kulpecz
A.A. Kulpecz
Chevron Energy Technology Company, 1500 Louisiana St., Houston, Texas 77002, USA, and Department of Earth and Planetary Sciences, Rutgers University, Piscataway, New Jersey 08854, USA
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Tiiu Elbra
Tiiu Elbra
Laboratory of Solid Earth Geophysics, Department of Physics, University of Helsinki, P.O. Box 64, Helsinki, 00014, Finland
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Published:
January 01, 2009

A 443.9-m-thick, virtually undisturbed section of postimpact deposits in the Chesapeake Bay impact structure was recovered in the Eyreville A and C cores, Northampton County, Virginia, within the “moat” of the structure's central crater. Recovered sediments are mainly fine-grained marine siliciclastics, with the exception of Pleistocene sand, clay, and gravel. The lowest postimpact unit is the upper Eocene Chickahominy Formation (443.9–350.1 m). At 93.8 m, this is the maximum thickness yet recovered for deposits that represent the return to “normal marine” sedimentation. The Drummonds Corner beds (informal) and the Old Church Formation are thin Oligocene units present between 350.1 and 344.7 m. Above the Oligocene, there is a more typical Virginia coastal plain succession. The Calvert Formation (344.7–225.4 m) includes a thin lower Miocene part overlain by a much thicker middle Mio-cene part. From 225.4 to 206.0 m, sediments of the middle Miocene Choptank Formation, rarely reported in the Virginia coastal plain, are present. The thick upper Miocene St. Marys and Eastover Formations (206.0–57.8 m) appear to represent a more complete succession than in the type localities. Correlation with the nearby Kiptopeke core indicates that two Pliocene units are present: Yorktown (57.8–32.2 m) and Chowan River Formations (32.2–18.3 m). Sediments at the top of the section represent an upper Pleistocene channel-fill and are assigned to the Butlers Bluff and Occohannock Members of the Nassawadox Formation (18.3–0.6 m).

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GSA Special Papers

The ICDP-USGS Deep Drilling Project in the Chesapeake Bay impact structure: Results from the Eyreville Core Holes

Gregory S. Gohn
Gregory S. Gohn
U.S. Geological Survey, Reston, Virginia, USA
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Christian Koeberl
Christian Koeberl
Department of Earth & Planetary Sciences, Rutgers University, USA
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Kenneth G. Miller
Kenneth G. Miller
Museum für Naturkunde–Leibniz Institute at Humboldt University Berlin, Germany
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Wolf Uwe Reimold
Wolf Uwe Reimold
Museum für Naturkunde–Leibniz Institute at Humboldt University Berlin, Germany
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Geological Society of America
Volume
458
ISBN print:
9780813724584
Publication date:
January 01, 2009

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