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USGS Coastal and Marine Geology Program

Field Activity Details for field activity A768NP

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AKA: none

Other ID: A-7-68-NP

Status: Completed

Organization(s): Scripps Institution Of Oceanography, La Jolla, Ca, USGS, National Center

Funding Program(s):

Principal Investigator(s):

Affiliate Investigator(s): Harry Ladd (USGS),W.A. Newman (SIO)

Information Specialist(s):

Data Type(s): Sonar: Single Beam, Sampling: Geology

Scientific Purpose/Goals: Geological and faunal investigation.

Vehicle(s):

Start Port/Location:

End Port/Location:

Start Date: 1968-09-06

End Date: 1968-09-14

Equipment Used: bathymetry, echosounder, dredge

Information to be Derived: Bathymetry, geologic age.

Summary of Activity and Data Gathered: The area in which rocks of Cretaceous age are known to occur was extended toward Wake Island during this cruise. Seismic and echo-sounder surveying proved that one of the guyots was actually an ancient atoll with its elevated rim now submerged more than 600 fathoms. Dredging on the atoll showed that its rim was built primarily by rudistids of Cretaceous age. Cretaceous corals were also obtained from the drowned atoll: some chert was present, and most of the dredged material was heavily encrusted with manganese oxide.

Staff:

Affiliate Staff:

Notes:

Staff information imported from InfoBank
Harry Ladd (USGS) - Chief Scientist
W.A. Newman (SIO) - Chief Scientist

Location:

North Pacific

Boundaries
North: 19.9928 South: 17.7687 West: 166.5407 East: 179.9854

Platform(s):


Alex. Agassiz

Publications

U. S. Geological Survey, 1969, GEOLOGICAL SURVEY RESEARCH 1969: U. S. Geological Survey Professional Paper 650-A, A96 p., http://pubs.usgs.gov/pp/0650a/report.pdf.

Portals/Viewers

Data Acquired

Survey EquipmentSurvey InfoData Type(s)Data Collected
bathymetry --- Single Beam
Edited bathymetry data with corrected depths a-7-68-np.325_050 (Provisional best file)
Edited bathymetry data with corrected depths a-7-68-np.325
echosounder --- Single Beam
dredge --- Geology

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