Sea-Floor Character and Sedimentary Processes of Great Round Shoal Channel, Offshore Massachusetts

Poppe, Lawrence J.; Ackerman, Seth D.; Foster, David S.; Blackwood, Dann S.; Williams, S. Jeffress; Moser, M. S.; Stewart, H. F.; Glomb, K. A.

Abstract:

INTRODUCTION The imagery, interpretive data layers, and data presented herein were derived from multibeam echo-sounder and sidescan-sonar data collected in the vicinity of Great Round Shoal Channel, the main passage through shoals located at the eastern entrance to Nantucket Sound, Massachusetts, and from the stations occupied to verify these acoustic data (fig. 1). Basic data layers show sea-floor topography, sun-illuminated shaded relief, and backscatter intensity; interpretive layers show the distributions of surficial sediment, sedimentary environments, and sea-floor features. Presented verification data include sediment grain-size analyses and a gallery of still photographs of the seabed. The multibeam and sidescan data, which together cover an approximately 39.9-km? area of sea floor, were collected during National Oceanic and Atmospheric Administration (NOAA) hydrographic survey H11079 (fig. 1). Although originally collected for charting purposes, these data provide a fundamental framework for research and management activities along this part of the Massachusetts coastline (Noji and others, 2004), show the composition and terrain of the seabed, and provide information on sediment transport and benthic habitat. This publication is the third in a series of U.S. Geological Survey (USGS) digital reports describing the sea-floor geology around Cape Cod. The first focused on the area off the eastern shore of the outer Cape (Poppe and others, 2006); the second on a passage through the Elizabeth Islands (Poppe and others, 2007).

Genre:

USGS Numbered Series

ProdID:

80520

Citation Author:

Poppe, Lawrence J.; Ackerman, Seth D.; Foster, David S.; Blackwood, Dann S.; Williams, S. Jeffress; Moser, M. S.; Stewart, H. F.; Glomb, K. A.

Citation Contributing Office:

USGS Woods Hole Science Center

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Citation Language:

ENGLISH

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Citation LatN:

0424500

Citation LatS:

0410000

Citation LonE:

-0693000

Citation LonW:

-0713000

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Citation Phsyical Description:

Available online and on DVD-ROM

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Citation Publisher:

Geological Survey (U.S.)

Citation Series:

Open-File Report

Citation Series Code:

OFR

Citation Series Number:

2007-1138

Citation Search Results Text:

Sea-Floor Character and Sedimentary Processes of Great Round Shoal Channel, Offshore Massachusetts; 2007; OFR; 2007-1138; Poppe, Lawrence J.; Ackerman, Seth D.; Foster, David S.; Blackwood, Dann S.; Williams, S. Jeffress; Moser, M. S.; Stewart, H. F.; Glomb, K. A.