Figure 9.

 

 

 

 Schematic representation during the formation of Lake Pontchartrain as sea-level rose.
(A) The Louisiana area was emergent during the late Wisconsinan lowstand, ~18k yrs BP;
(B) as sea-level rise neared present levels the Pine Island Barrier developed, ~6k yrs BP;
(C) sea-level rise slows and a relatively short stillstand initiates development of the Pine Island Spit and forming the Pontchartrain Embayment, ~5k yrs BP; and
(D) a subdelta of the Mississippi River the St. Bernard progrades across the area
(E) forming Lake Pontchartrain and associated lakes.

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U.S. Department of the Interior, U.S. Geological Survey
URL: http://pubs.usgs.gov/of/1998/of98-805/html/jk_9.htm
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