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1920-1985
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Coast Geodetic Survey
Nautical Charting
Bathymetry Mapping the Features
1920 - 1985
Bathymetry Mapping the Features
Early continuous sounding record from acoustic system.Off of OCEANOGRAPHER.C&GS; didn't use recording instruments until late 1930's
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Submarine valley discovered in Georges Bank area.Work done by OCEANOGRAPHER
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Submarine valleys of Georges Bank.Contoured by Dr. Francis P. Shepard, the father of marine geology.Work done by OCEANOGRAPHER
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The Mendocino Escarpment.The initial indication of the great seafloor fracture zones.Surveyed by GUIDE between 1935-1938
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First discoveries of PIONEER and GUIDE Seamounts.Seamounts discovered by PIONEER and GUIDE.
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Davidson Seamount named for George Davidson of the C&GS.;This feature was the first called a seamount.Officially named by the U.S. Board on Geographic Names.Discovered by GUIDE in 1933.Error - latitude should range from 35 to 36
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Identified as submerged atolls on Palawan Bank.Note similarity in shape to salt structures in Gulf of Mexico.See images theb.3833.htm and theb.3834.htm
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Shallow water bathymetry.Sand waves off Padre Island.Delineation possible because of widespread use of recording fathometers
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The first guyot -discovered by Harry Hess of Princeton University.Flat-topped seamounts which are common in the Pacific.Discovered by Hess as naval officer in WWII. Contrary to popular belief, flat-topped seamounts were first discovered by the C&GS
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Precision depth recorder record of small seamount on side of Easter Island.Acquired by Scripps Institution of Oceanography.Record from ship THOMAS G. WASHINGTON
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Profile of Bowers Bank.Surveyed by PATHFINDER
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Constructing three dimensional model of Bowers Bank.C&GS; marine geologist at work.Photo #1 of sequence
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Constructing three dimensional model of Bowers Bank.C&GS; marine geologist at work.Photo #2 of sequence
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Constructing three dimensional model of Bowers Bank.C&GS; marine geologist at work.Photo #3 of sequence
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Trincomalee Canyon, Sri Lanka.Surveyed by PIONEER.Survey made during International Indian Ocean Expedition
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