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Acti vity of Subsidence Mechanism By Zone Underlain by buried firm Pleistocene surface Primarily Shallow Surface Compaction Fault Driven Subsidence is more related to deep rooted tectonic faults than listric sedimentary faults Marshes at the surface in Zone 1 are the oldest in the area, indicating long term relative stability . The Atchafalaya is the first new delta to build land in Zone 1 in a long time, and is benefitting from the stability modified from BLUM & ROBERTS, 2011
