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1 edition of Stratigraphy, correlation, and depositional environments of the middle to late Pleistocene interglacial deposits of southern Delaware found in the catalog.

Stratigraphy, correlation, and depositional environments of the middle to late Pleistocene interglacial deposits of southern Delaware

Kelvin W. Ramsey

Stratigraphy, correlation, and depositional environments of the middle to late Pleistocene interglacial deposits of southern Delaware

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Published by University of Delaware, Delaware Geological Survey in Newark .
Written in English

    Subjects:
  • Stratigraphic Geology,
  • Geology

  • About the Edition

    Rising and highstands of sea level during the middle to late Pleistocene deposited swamp to nearshore sediments along the margins of an ancestral Delaware Bay, Atlantic coastline, and tributaries to an ancestral Chesapeake Bay. These deposits are divided into three lithostratigraphic groups: the Delaware Bay Group, the Assawoman Bay Group (named herein), and the Nanticoke River Group (named herein). The Delaware Bay Group, mapped along the margins of Delaware Bay, is subdivided into the Lynch Heights Formation and the Scotts Corners Formation. The Assawoman Bay Group, recognized inland of Delaware"s Atlantic Coast, is subdivided into the Omar Formation, the Ironshire Formation, and the Sinepuxent Formation. The Nanticoke River Group, found along the margins of the Nanticoke River and its tributaries, is subdivided into the Turtle Branch Formation (named herein) and the Kent Island Formation. Delaware Bay Group deposits consist of bay-margin coarse sand and gravel that fine upward to silt and silty sand. Beds of organic-rich mud were deposited in tidal marshes. Near the present Atlantic Coast, the Delaware Bay Group includes organic-rich muds and shelly muds deposited in lagoonal environments. Assawoman Bay Group deposits range from very fine, silty sands to silty clays with shells deposited in back-barrier lagoons, to fine to coarse, well-sorted sands deposited in barriers and spits. Nanticoke River Group deposits consist of coarse sand and gravel that fine upward to silty clays. Oyster shells are found associated with the clays in the Turtle Branch Formation. Organic-rich clayey silts were deposited in swamps and estuaries. Well-sorted fine sands to gravelly sands were deposited on beaches and tidal flats on the flanks of the ancestral Nanticoke River and its tributaries. The Lynch Heights, Omar, and Turtle Branch Formations are age-equivalent units associated with highstands of sea level,which occurred at approximately 400,000 and 325,000 yrs B.P. (MIS 11 and 9, respectively). The Scotts Corners, Ironshire, Sinepuxent, and Kent Island Formations are age-equivalent units associated with highstands of sea level, which occurred between 120,000 and 80,000 yrs B.P. (MIS 5e and 5a, respectively).

    Edition Notes

    Also available on the World Wide Web.

    Statementby Kelvin W. Ramsey
    SeriesReport of investigations -- no. 76, Report of investigations (Delaware Geological Survey) -- no. 76.
    Classifications
    LC ClassificationsQE697 .R175 2010
    The Physical Object
    Pagination43 p. :
    Number of Pages43
    ID Numbers
    Open LibraryOL24864835M
    LC Control Number2011388330
    OCLC/WorldCa632338735


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Stratigraphy, correlation, and depositional environments of the middle to late Pleistocene interglacial deposits of southern Delaware by Kelvin W. Ramsey Download PDF EPUB FB2