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Metadata
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ID
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A-7-68-NP
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Abstract
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United States Geological Survey,Scripps Institution of
Oceanography. Chief Scientists: Harry Ladd, W.A. Newman.
Geological and Geophysical data (bathymetry, echosounder,
dredge) of field activity A-7-68-NP in Wake Island area,
North Pacific from 09/06/1968 to 09/14/1968
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Organization
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United States Geological Survey
Scripps Institution of Oceanography
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Chief Scientist
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Harry Ladd
W.A. Newman
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Activity Type
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Geological and Geophysical
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Platform
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Alex. Agassiz
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Area of Operation
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Wake Island area, North Pacific
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Location map
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Bounding Coordinates
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19.99280
166.54070 179.98540
17.76870
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Dates
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09/06/1968 (JD 250) to 09/14/1968 (JD 258)
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Analog Materials
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No analog holdings.
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Index map
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Crew
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Harry Ladd
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Chief Scientist, USGS
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W.A. Newman
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Chief Scientist, SIO
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Equipment Used
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bathymetry
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echosounder
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dredge
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Purpose
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Geological and faunal investigation.
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Information to be Derived
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Bathymetry, geologic age.
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Summary
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The area in which rocks of Cretaceous age are known to occur was
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extended toward Wake Island during this cruise. Seismic and echo-sounder
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surveying proved that one of the guyots was actually an ancient atoll with
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its elevated rim now submerged more than 600 fathoms. Dredging on the atoll
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showed that its rim was built primarily by rudistids of Cretaceous age.
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Cretaceous corals were also obtained from the drowned atoll: some chert was
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present, and most of the dredged material was heavily encrusted with
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manganese oxide.
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Publications
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U.S. Geological Survey, 1969, Geological survey research 1969: U.S.
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Geological Survey Professional Paper 650-A, p. A96.
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Got Help?
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For A-7-68-NP, we would appreciate any information on -- analog materials, contract, days at sea, dive count, funding, information specialist, kms of navigation, national plan, NGDC Info, notes, owner, ports, project, project number, scanned materials, seismic description, station count, station description, submersible, tabulated info.
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