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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.
Geophysical and geological 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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Geophysical and geological
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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 -- information to be derived, equipment used, information specialist, ports, project, publications, purpose, summary.
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