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From analysis of a high-resolution arcer survey of the young sediments in the western clastic region of the Gulf of Mexi cocontinental slope, and study of 29 300-m core holes, six facies type shave been defined from their appearance on seismicsections. The sedimentary facies that correspond to these seismic-facies type shave been interpreted and some progress has been made in identifying the transportation deposition processes responsible for each facies. The six seismic facies and their sedimentary equivalents are: (1)divergent and parallel layered, avaried, deposited in uniform layers; (2)sheet drape—hemipelagic deposits; (3)on lapping fill—probably both high-energy and low-energy turbidites; (4)sigmoid progradational— varied, mainly low-energy submarine deposits formed by out building from relatively shallow to relatively deep water; (5)oblique progradational— shelf-margin delta sand related marine facies; (6)mounded chaotic—submarine creep-and-slump deposits, mass-transport facies.

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