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Summary Information for Field Activity 1982-032-FA

Area of Operations: Block Island Sound

Dates: September 08, 1982 to September 19, 1982

Chief scientist: Sally Needell

   Ralph Lewis - Geologist, Connecticut Department of Environmental Protection

Objectives: (1) Define the geology and shallow structure of eastern Long Island Sound; (2) determine the geologic framework and Quaternary development of the study area; (3) identify and map potential geologic hazards; and (4) test the 300 J pressurized minisparker across Block Island Sound and compare records with Uniboom records from ASTERIAS 81-2, Block Island Sound cruise, September 1982.

Type of Activity: Sea floor mapping; Equipment testing;Sea floor mapping
Equipment testing

Information to be derived: Sea floor map; Morphology;

Summary: Despite numerous equipment failures during the first 4 days of the survey, the Uniboom data were very good (excellent resolution and good penetration) except in areas underlain by gas which attenuated the signal. Sidescan sonar records were satisfactory. Records collected in Block Island Sound using the minisparker system were compared to former Uniboom records. The sparker records were found to be inferior in resolution and penetration. Minisparker: 43 km; Uniboom: 677 km; Sidescan sonar: 511 km.

Contact: Sally Needell ()

InfoBank: uses the identifier A-3-82-LI. Visit this site for more information.

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Publications resulting from these data

Poppe, L.J., Paskevich, V.F., Lewis, R.S., and DiGiacomo-Cohen, M.L.,2002, Geological framework data from Long Island Sound, 1981-1990; a digital data release: U.S. Geological Survey Open-File Report 02-002, DVD-ROM. (Also available at

Poppe, L. J., Williams, S. J., Moser, M. S., Forfinski, N. A., Stewart, H. F., and Doran, E. F.,2008, Quaternary geology and sedimentary processes in the vicinity of Six Mile Reef, eastern Long Island Sound: Journal of Coastal Research, v. 24, no. 1: p. 255-266. (Also available at

Poppe, L.J., Denny, J.F., Williams, S.J., Moser, M.S., Forfinski, N.A., Stewart, H.F., and Doran, E.F.,2007, The geology of Six Mile Reef, Eastern Long Island Sound: U.S. Geological Survey Open-File Report 2007-1191, DVD-ROM. (Also available at

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