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Summary for Field Activity Number 1984-009-FA

Alternate Leg ID: J-163 (Leg IV)

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

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 Grounds 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.

USGS Project Number:

Contact: Dave Twichell (

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

Map for Area of Operations :

Map of field activity boundary.

Platform Info:

The following materials for this field activity are available in the Information Archives:

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