Paleontologic control in south Louisiana and the adjacent Gulf of Mexico is among the best in the world. With this control it is possible to construct relatively detailed paleogeographic maps and interval-isopach maps based on biostratigraphic markers. Careful study of these maps clearly defines areas having maximum potential for hydrocarbon accumulation. Currently accepted biostratigraphic units as defined by Foraminifera range in age from Paleocene through Pleistocene.

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