448 THE MISSISSIPPI BELOW NEW ORLEANS. [Ch. XIX. 



while, in the other, we have on each side the salt water of 



Mexico 



Fig. 32. 



a. 



Map of part of the delta of the Mississippi below New Orleans* 

 a. Post-Pliocene formation, partly marine and partly of cypress-swamp 



origin, called by Prof. Hilgard ' Coast-Pliocene. 



In this region, where so rapid a conversion is going on from 

 sea into land, a phenomenon occurs which is without para e , 



* Humphreys and Abbot, Report on the Mississippi River, Plate II. 



C* 



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jo 



far 



as 



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H* 



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5!.:. 









