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Stratigraphic framework maps of the nearshore area of southern Long Island from Fire Island to Montauk Point, New York

Open-File Report 99-559

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Abstract

The maps presented in this report (depth to Coastal Plain unconformity, Quaternary sediment thickness, paleochannel thickness, and modern sand thickness) are helpful for determining sand-resource availability for beach nourishment programs and understanding the influence that the inner-shelf framework of southern Long Island has on coastal processes and evolution. The maps showing structure of the Coastal Plain unconformity and thickness of overlying Quaternary sediment delineate the framework of the coastal region. The map showing the distribution and thickness of paleochannel fill indicates areas not suitable as sources for beach nourishment, assuming the channels contain muddy estuarine deposits. The areas between channels are Pleistocene glacial deposits and probably consist of coarse sediment that may be suitable for beach nourishment. These coarser-grained glacial deposits are the source for modern sand deposits. The modern sands have been reworked primarily from glacial deposits and a Cretaceous outcrop off Watch Hill. These reworked deposits provide well-sorted clean sand that have and will provide nourishment for southern Long Island beaches.

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Stratigraphic framework maps of the nearshore area of southern Long Island from Fire Island to Montauk Point, New York
Series title:
Open-File Report
Series number:
99-559
Edition:
-
Year Published:
1999
Language:
ENGLISH
Description:
6 maps on 2 sheets :col. ;35 x 64 cm. or smaller, sheets 102 x 139 cm., folded to 26 x 22 cm.