All the names of Jackson formations, members, and other subdivisions described in the area from the Rio Grande River of Texas through Louisiana and Mississippi to eastern Alabama with part of Arkansas are given with a history of the nomenclature. A correlation

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chart is also given. Paleo-stratigraphic units relating the surface and subsurface are established. These units from youngest to oldest are: upper shallow-water facies, Discorbis texana, upper deeper-water facies, Marginulina cocoaensis; middle shallow-water facies, Textularia hockleyensis, middle deeper-water facies, Lenticulina fragaria var. texasensis; lower, Textularia dibollensis; basal, Camerina and Operculina units. A diagrammatic section illustrating the foraminiferal ecology is presented. Electric logs giving the subsurface section are included.

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