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 (email@example.com)
InfoBank: uses the identifier J-4-84-NE. Visit this site for more information.