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Middle Miocene and middle Pliocene deep-water sandstone reservoirs of the western Gulf Coast Basin are associated with failed shelf margins and subregional unconformities referred to as submarine pediments. The submarine pediments formed broad, convex-landward arcs along nondeltaic slopes and on the southwestern flanks of subjacent delta systems. They were created by retrogressive failure and were later enlarged by erosion during periods of lowered sea level. At times of lowered sea level, the deep embayments that carved into the continental platform funneled nearshore sands downslope to basin-floor fans.

The pediments were first backfilled by deep-water mudstones deposited by mass-transport processes....

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