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Summary Information for Field Activity 1984-009-FA

Area of Operations: Middle Grounds area, Block Canyon, Atlantis Canyon, Veatch Canyon, mid-Atlantic Bight, North America, North Atlantic

Dates: July 28, 1984 to August 04, 1984

Chief scientist: Dave Twichell

   Dr. Robert S. Jones (HBF); Dr. Churchill B. Grimes (Rutgers)

Objectives: 1) Test our hypothesis that rough bottom topography in the Mid-Atlantic Bight resulted from bioerosion by the tilefish community, and 2) further develop the use of sidescan sonar and sub-bottom profiling as a tool for assessing critical habitat for fishery resources.

Type of Activity:

Information to be derived:

Summary: Optimal weather conditions allowed us to conduct a variety of submersible, sidescan sonar and sub-bottom profiling operations in the Middle Ground area between Block and Atlantis submarine canyons. Overall, we successfully completed 13 submersible dives and made numerous transects for sidescan sonar. Sidescan Sonar: 129.64 km; Sub-bottom profiling: 290.39; Sediment samples: 26; video and photos.

Contact: Dave Twichell (

InfoBank: uses the identifier J-4-84-NE. Visit this site for more information.

Related Links:

Platform Info:

Publications resulting from these data

Able, K.W., Grimes, C.B., Jones, R.S., and Twichell, D.C.,1993, Temporal and spatial variation in habitat characteristics of tilefish (Lopholatilus hamaeleonticeps) off the east coast of Florida: Bulletin of Marine Sciences, v. 53: p. 1013-1026

Twichell, D. C., Jones, R. S., Grimes, C. B., Able, K. W., Anonymous,,1984, Bioerosion; its importance in shaping the outer continental shelf around Hudson Canyon off the eastern United States [abs.]: Symposia Series for Undersea Research, NOAA National Undersea Research Conference; Undersea research and technology, scientific applications and future needs, Abstracts, v. 2, no. 1, unpaginated

Twichell, D. C., Grimes, C. B., Jones, R. S., and Able, K. W.,1984, The role of bioerosion in shaping the outer continental shelf around Hudson Canyon, offshore Eastern United States [abs.]: Geological Society of America, Northeastern Section, 19th Annual Meeting, Abstracts with Programs, v. 16, no. 1: p. 68

Able, K.W., Twichell, D.C., Grimes, C.B., and Jones, R.S.,1987, Sidescan sonar as a tool for detection of Demersal fish habitats: Fishery Bulletin, v. 85, no. 4: p. 725-736

Data Types and Locations:


Data is in the Data Library - contact Data Manager (

Data is in the Data Library - contact Data Manager (bbuczkowski#&64;usgs#&46;gov)

Data is in the Data Library - contact Data Manager (


Chief Scientist's report of personnel, objective, results, and trackmaps.

Oceanographic MeasurementsPhotosSamplesSeismics

Data is in the Data Library - contact Data Manager (


Data is in the Data Library - contact Data Manager (



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