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Summary for Field Activity Number 1975-016-FA

Alternate Leg ID: 75-5

Area of Operations: Baltimore Trough, Middle Atlantic continental shelf, United States, North America, North Atlantic

Dates: August 22, 1975 to August 26, 1975

Objectives: The cruise was conducted to make direct observations of geologic, biologic, and hyrologic conditions at three sites where vibracore pipes and railroad wheels had been placed on the bottom as permanent reference markers. All are located in areas where leasing for oil exploration will probably occur. Though the pipes and wheels had been set in June, the specific objective of the dives was to establish geologic and biologic baseline conditions around them. Of primary concern was the magnitude, distribution and character of ripples on the bottom because they indicate, in part, the extent of bottom sediment mobility.

Type of Activity: Sampling

Information to be derived: Geologic, biologic, and hydrologic conditions

Summary: Observers on the submarine included USGS personnel and biologists from the Virginia Institute of Marine Science, the Environmental Protection Agency, and the Westinghouse Corporation. Aboard the submarine these observers collected both color and black and white 35 mm photography and video tapes at each site. They also collected sediment samples from specific localities on the bottom. When the submarine was not in the water, other data collected from the ADVANCE II included bathythermograph lowerings, nephelometer lowerings, a series of Niskin bottle casts which resulted in the collection of suspended matter samples, bottom photos, Shipek and Smith-McIntyre grab samples, and sidescan sonar traverses. Dives: 16 (#463-465, 467-479); Sediment samples: 9; BTs: 39; Nephelometer lowerings: 2; Suspended matter samples: 9; Bottom photos: 100; Shipek and Smith-McIntyre grab samples: 13; Sidescan sonar traverses: 3; Color and B/W 35 mm photos; Videos.

USGS Project Number: EA

Contact: Dave Folger ()

Map for Area of Operations :

Map of field activity boundary.

Platform Info:
photo of ADVANCE II
photo of NEKTON BETA
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