A broad doming of the Gulf coastal 250 m in thickness [Fisk and MacFarlan, 1955]. It plain between Jackson, Mississippi, and New is not clear how movement on the east-west Orleans, Louisiana is indicated by leveling trending slump faults, which cut the coastal surveys carried out in 1934, 1959, 1964, and plain, contributes to regional subsidence. These 1969. The progressive arching over a distance of faults, initially formed during deltaic 275 km attains a maximum average rate of 3.4_+0.5 deposition, result from differential compaction mm/yr relative to Jackson. Additional leveling in [Cloos, 1968] and gravitational instability

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