--> --> Abstract: Shallow Sedimentary Framework of Georges Bank, by R. S. Lewis, R. E. Sylwester; #90968 (1977).

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Abstract: Shallow Sedimentary Framework of Georges Bank

R. S. Lewis, R. E. Sylwester

Minisparker data were collected during ship traverses totaling 2,900 km on Georges Bank by the U.S. Geological Survey during October 1975. Several sedimentary features have been observed in the data. The bank is recognized as a compound feature resulting from erosion of Tertiary coastal-plain strata followed by deposition of an extensive sediment wedge on the western flank of the cuesta. Marine planation (probably during the late Pleistocene) truncated the bank, producing an erosion surface roughly paralleling the present seafloor. The truncated bank surface is blanketed by a veneer of complex upper Pleistocene drift, which masks underlying features and which is being reworked by modern processes. Present bank morphology is inferred to be a rather recent development. A pr per understanding of the significance of complex bank sediments with respect to the potential geologic hazards of drilling or placement of bottom-supported structures necessitates a more detailed seismic-reflection program in conjunction with geotechnical analysis of core samples.

AAPG Search and Discovery Article #90968©1977 AAPG-SEPM Annual Convention and Exhibition, Washington, DC