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Presented at the 1980 Northeastern Section GSA Meeting Philadelphia, Pennsylvania, 15 March 1980 PALEOMAGNETIC INVESTIGATION OF PLEISTOCENE SEDIMENTS IN THE DELMARVA PENINSULA, CENTRAL ATLANTIC COASTAL PLAIN LIDDICOAT, Joseph C., Lamont-Doherty Geological Observatory, Columbia University, Palisades, NY 10964; MIXON, Robert B., U.S. Geological Survey, National Center, MS 925, Reston, VA 22092 Unconsolidated sand, silt, and clay of marginal marine origin, herein informally called the Accomack deposits, record a major trans- gression of the sea in the southern Delmarva area in Pleistocene time. The paleomagnetic studies were initiated to help evaluate widely varying absolute ages obtained for the Accomack deposits by different laboratory dating techniques. Outcrop samples and fully oriented, brass Shelby-tube cores (7-cm diameter) from several localities in the central upland west of Chincoteague, Virginia, have magnetization of normal paleomagnetic polarity. Two coring sites, Nash (T's) Corner and Mathew's Field, are of particular interest because the section includes shell beds studied by radiocarbon, uranium-series, and amino-acid-racemization dating methods. At the coring sites, samples of dark-gray clayey silt at 7.75-m (Nash Corner) and 8.42-m (Mathew's Field) depths have nearly identical paleomagnetic directions following demagnetization in a 200-Oe peak alternating field. The lithology, the virtual lack of change in paleomagnetic direction during demagnetization, and the demagnetization spectra (median destructive field is 150 Oe) show no evidence for a stable secondary magnetization. Samples from three nearby outcrops were demagnetized the same way and gave similar results Therefore, on the basis of the paleomagnetic data and stratigraphic relationships to adjacent rock units of late Pleistocene age, we consider the Accomack deposits to be of Brunhes age ( From the outcrop sections, we also collected samples for thermal demagnetization, soon to be completed.

Magnetostratigraphy of sediments in the Atlantic Coastal Plain and Pacific Coast of the United States as an aid for dating tectonic deformation