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  • 1
    Publication Date: 2017-01-04
    Description: This paper is not subject to U.S. copyright. The definitive version was published in Geo-Marine Letters 32 (2012): 279-288, doi:10.1007/s00367-012-0296-9.
    Description: High-resolution seismic-reflection profiles collected across pro-glacial outwash deposits adjacent to the circa 18 ka b.p. Orient Point–Fishers Island end moraine segment in westernmost Block Island Sound reveal extensive deformation. A rhythmic seismic facies indicates the host outwash deposits are composed of fine-grained glaciolacustrine sediments. The deformation is variably brittle and ductile, but predominantly compressive in nature. Brittle deformation includes reverse faults and thrust faults that strike parallel to the moraine, and thrust sheets that extend from beneath the moraine. Ductile deformation includes folded sediments that overlie undisturbed deposits, showing that they are not drape features. Other seismic evidence for compression along the ice front consists of undisturbed glaciolacustrine strata that dip back toward and underneath the moraine, and angular unconformities on the sea floor where deformed sediments extend above the surrounding undisturbed correlative strata. Together, these ice-marginal glaciotectonic features indicate that the Orient Point–Fishers Island moraine marks a significant readvance of the Laurentide ice sheet, consistent with existing knowledge for neighboring coeval moraines, and not simply a stillstand as previously reported.
    Description: This work was supported by the Connecticut Department of Environmental Protection, and the Atlantic Hydrographic Branch of the National Oceanic and Atmospheric Administration.
    Description: 2013-06-29
    Repository Name: Woods Hole Open Access Server
    Type: Article
    Format: application/pdf
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  • 2
    Map available for loan
    Map available for loan
    Washington, DC : U. S. Geological Survey
    Associated volumes
    Call number: MAP GQ-1114 K 1975.7726 / R16
    In: Geologic quadrangle map
    Type of Medium: Map available for loan
    Pages: 1 Kt. : mehrfarb. ; 42 x 65 cm, 21 x 28 xm gefaltet im Umschlag , mehrfarb
    Series Statement: Geologic quadrangle maps of the United States GQ-1114
    Location: Upper compact magazine
    Branch Library: GFZ Library
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