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Conceptual model of the delta cycle by Penland et al (1988)

Four figures showing the conceptual model of the delta cycle which focuses on the transgressive phase of the delta cycle. Stage 1 is followed by submergence, Stage 2, then submergence again, Stage 3, reoccupation, active delta, and lastly abandonment. The figures show regressive environments including distributary; fresh marsh; and beach ridges, transgressive environments including subaerial barrier; subaqueous barrier; sand sheet; saltwater marsh; recurved spits; tidal inlet; and shell reefs.

The model by Penland et al. (1988) focuses on the transgressive (marine dominated) phase of the delta cycle, subdividing the cycle into three stages: stage 1—erosional headland with flanking barriers, stage 2— transgressive barrier arc, and stage 3—inner-shelf shoal. At present, the Lafourche delta lobe exemplifies stage 1; associated spits and barrier islands include the Caminada-Moreau headland and Grand Isle (see figs. 1 and 3). A present-day example of stage 2 is the St. Bernard delta lobe and Chandeleur Islands. The Maringouin delta lobe and Ship Shoal illustrate stage 3 (see figs. 1 and 3). The “active delta” represents the regressive (fluvial dominated) phase.

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Graphic by Trista Thornberry-Ehrlich (Colorado State University) after Penland et al. (1988, figure 14).

Public domain:Full Granting Rights

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Jean Lafitte National Historical Park and Preserve, Code: JELA

Jean Lafitte National Historical Park and Preserve, Louisiana
Latitude: 29.8020095825195, Longitude: -90.1701812744141

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