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Seismic-Reflection Identification of Susquehanna River Paleochannels on the Mid-Atlantic Coastal Plain

Published online by Cambridge University Press:  20 January 2017

Robert B. Genau ,
John A. Madsen ,
Susan McGeary  and
John F. Wehmiller
Robert B. Genau
Affiliation:
Department of Geology, University of Delaware, Newark, Delaware 19716
John A. Madsen
Affiliation:
Department of Geology, University of Delaware, Newark, Delaware 19716
Susan McGeary
Affiliation:
Department of Geology, University of Delaware, Newark, Delaware 19716
John F. Wehmiller
Affiliation:
Department of Geology, University of Delaware, Newark, Delaware 19716
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Abstract

Land-based, high-resolution seismic-reflection methods were used to image Quaternary paleochannels of the Susquehanna River system. Using a portable, 12-channel signal-enhancing seismograph, 12 accelerometers as receivers, and a 4.54-kg sledge hammer struck against an aluminum plate as a source, a sixfold, multichannel seismic profile 2.5 km long was acquired at Taylors Island, Maryland. On the processed seismic profile, pronounced high-amplitude seismic reflections delineate the unconformity between Quaternary and underlying Tertiary sediments and the disconformable contact separating Miocene and Eocene deposits. Subsurface-seismic stratigraphic relationships that clearly indicate the presence of two paleochannels were observed, one believed to be the Exmore paleochannel, projected to underlie northern Taylors Island based on marine seismic data. An overlapping sequence of fill sediments was observed on the eastern margin of the Exmore paleochannel. The second paleochannel may be a tributary of the Exmore or possibly the western edge of the younger Eastville paleochannel. Results from this study indicate that land-based, shallow, high-resolution seismic-reflection data can be used to delineate subsurface geomorphology successfully in coastal plain environments. This technique of defining erosional surfaces and depositional units beneath present land areas, when integrated with chronostratigraphic data, is a powerful tool for developing a better understanding of the Quaternary record.

Type
Research Article
Information
Quaternary Research , Volume 42 , Issue 2 , September 1994 , pp. 166 - 175
Copyright
University of Washington

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References

Belknap, D. F. (1979). “Application of Amino Acid Geochronology to Stratigraphy of Late Cenozoic Marine Units of the Atlantic Coastal Plain.” Unpublished Ph.D. dissertation, University of Delaware.Google Scholar
Carron, M. (1979). “The Virginia Chesapeake Bay—Recent Sedimentation and Paleodrainage.” Unpublished Ph.D. dissertation, Virginia Institute of Marine Science, College of William and Mary.Google Scholar
Colman, S. M. Halka, J. P. Hobbs, C. H. III Mixon, R. B., and Foster, D. S. (1990). Ancient channels of the Susquehanna River beneath Chesapeake Bay and the Delmarva Peninsula. Geological Society of America Bulletin 102, 1268–1279.2.3.CO;2>CrossRefGoogle Scholar
Colman, S. M., and Halka, J. P. (1989a). “Quaternary Geology of the Northern Maryland Part of the Chesapeake Bay.” U.S. Geological Survey Miscellaneous Field Studies Map MF-1948-C, scale 1: 125.000. Google Scholar
Colman, S. M., and Halka, J. P. (1989b). “Quaternary Geology of the Southern Maryland Part of the Chesapeake Bay.” U.S. Geological Survey Miscellaneous Field Studies Map MF-1948-D, scale 1: 125.000.Google Scholar
Colman, S. M., and Hobbs, C. H. III (1987). “Quaternary Geology of the Southern Virginia Part of the Chesapeake Bay.” U.S. Geological Survey Miscellaneous Field Studies Map MF-1948-A, scale 1: 125.000.Google Scholar
Colman, S. M., and Hobbs, C. H. III (1988). “Quaternary Geology of the Northern Virginia Part of the Chesapeake Bay.” U.S. Geological Survey Miscellaneous Field Studies Map MF-1948-B, scale 1: 125.000.Google Scholar
Colman, S. M., and Mixon, R. B. (1988). The record of the major Quaternary sea-level fluctuations in a large coastal plain estuary, Chesapeake Bay, eastern United States. Palaeogeography, Palaeoclimatology, and Palaeoecology 68, 99–116.Google Scholar
Foyle, A.M., and Oertel, G. F. (1992). Seismic stratigraphy and coastal drainage patterns in the Quaternary section of the southern Delmarva Peninsula, Virginia, USA. Sedimentary Geology 80, 261–277.Google Scholar
Groot, J. J. Ramsey, K. W., and Wehmiller, J. F. (1990). “Ages of the Bethany, Beaverdam, and Omar formations of Southern Delaware,” Delaware Geological Survey Report of Investigations No. 47.Google Scholar
Hack, J. T. (1957). Submerged river system of Chesapeake Bay. Geological Society of American Bulletin 68, 817–830.Google Scholar
Hansen, H. J. III, (1966). “Pleistocene Stratigraphy of the Salisbury area, Maryland, and Its Relationship to the Lower Eastern Shore—A Subsurface Approach.” Maryland Geological Survey Report of Investigations.Google Scholar
Harrison, W. Malloy, R. J. Rusnak, G. A., and Terasmae, J. (1965). Possible late Pleistocene uplift, Chesapeake Bay entrance. Journal of Geology 73, 201–229.Google Scholar
Irons, L. Lewis, B., and McGuire, M. (1991). “A Shallow HighResolution Seismic Reflection Program to Characterize Hydrogeology.” Symposium on the Application of Geophysics to Environmental and Engineering Problems, Knoxville, Tennessee, Proceedings, pp. 81–95.Google Scholar
Jacobs, J. M. (1980). “Stratigraphy and Lithology of Quaternary Landforms on the Eastern Coast of the Chesapeake Bay.” Unpublished M.S. thesis, University of Delaware.Google Scholar
Kerhin, R. T. Halka, J. P., and Conkwright, R. D. (1980). Identification of a paleochannel system under the eastern flank of the Chesapeake Bay. Geological Society of America Abstracts with Programs 12, 461.Google Scholar
Knapp, R. W., and Steeples, D. W. (1986a). High-resolution commondepth-point reflection profiling: Field acquisition parameter design. Geophysics 51, 283–294.CrossRefGoogle Scholar
Knapp, R. W., and Steeples, D. W. (19486b). High-resolution common-depth-point reflection profiling: Instrumentation. Geophysics 51, 276–282.Google Scholar
Mixon, R. B. (1985). “Stratigraphic and Geomorphic Framework of Uppermost Cenozoic Deposits in the Southern Delmarva Peninsula, Virginia and Maryland,” U.S. Geological Survey Professional Paper 1067-G.CrossRefGoogle Scholar
Mixon, R. B. Szabo, B. J., and Owens, J. P. (1982). “Uranium-Series Dating of Mollusks and Corals, and Age of Pleistocene Deposits, Chesapeake Bay Area, Virginia and Maryland,” U.S. Geological Survey Professional Paper 1067-E.CrossRefGoogle Scholar
Rasmussen, W. C., and Slaughter, T. H. (1957). Ground-water resources. In “The Water Resources of Caroline, Dorchester, and Talbot Counties,” Maryland Department of Geology, Mines and Water Resources Bulletin 18, pp. 1–371, 447–465.Google Scholar
Ryan, J. D. (1953). “The Sediments of Chesapeake Bay,” Maryland Department of Geology, Mines, and Water Resources Bulletin 12.Google Scholar
Schubel, J. R., and Zabawa, C. F. (1973). Susquehanna River paleochannel connects lower reaches of Chester, Miles, and Choptank River estuaries: Chesapeake. Science 14, 58–62.Google Scholar
Shideler, G. L. Ludwick, J. C. Oertel, G. F., and Finkelstein, K. (1984). Quaternary stratigraphic evolution of the southern Delmarva Peninsula coastal zone, Cape Charles, Virginia. Geological Society of America Bulletin 95, 489–502.2.0.CO;2>CrossRefGoogle Scholar
Szabo, B. J. (1985). Uranium-series dating of fossil corals from marine sediments of southeastern United States Atlantic Coastal Plain. Geo-logical Society of America Bulletin 96, 398–406.Google Scholar
Vail, P. R. Mitchum, R. M. Jr., and Thompson, S. III, (1977). Seismic stratigraphy and global changes of sea level. Part 3. Relative changes of sea level from coastal onlap. In “Seismic Stratigraphy—Applications to Hydrocarbon Exploration” (Payton, C. E., Ed.), American Association of Petroleum Geologists Memoir 26, pp. 63–82.Google Scholar
Wehmiller, J. F. Belknap, D. F. Boutin, B. S. Mirecki, J. F. Rahaim, S. D., and York, L. L. (1988). A review of the aminostratigraphy of Quaternary mollusks from United States Atlantic Coastal Plain sites. In “Dating Quaternary Sediments” (Easterbrook, D. L., Ed.), Geological Society of America Special Paper 227, pp. 69–110.Google Scholar
Weigle, J. M. (1972). “Exploration and Mapping of the Salisbury Paleochannel, Wicomico County, Maryland,” Maryland Geological Society Bulletin 31, Part 2.Google Scholar
Widess, M. B. (1973). How thin is a thin bed? Geophysics 38, 1176–1180.Google Scholar
York, L. L. Wehmiller, J. F. Cronin, T. M., and Ager, T. A. (1989). Stetson Pit, Dare County, North Carolina: An integrated chronologic, fauna, and floral record of subsurface coastal Quaternary sediments. Palaeogeography, Palaeoelimatology, and Palaeoecology 72, 115–132.Google Scholar