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A high-resolution single-channel seismic survey of the Mississippi-Alabama continental shelf and upper slope revealed relatively thin upper Pleistocene and Holocene deposits. The stratigraphy was defined by identifying depositional and erosional episodes recognized on seismic profiles by geomorphic patterns, high-angle clinoform progradational deposits, buried stream entrenchments, planar conformities, and erosional unconformities.

The regional bathymetry shows a gently sloping shelf with a relatively steeper continental slope. Local tectonics have had minimal effect on the shelf, with surface and subsurface faults exhibiting a random pattern. Diapirs on the shelf break and upper slope, in contrast, have created several topographic highs with associated...

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