ABSTRACT

The Lower Cretaceous of Mississippi is present only in the subsurface. It is composed of the Comanche series alone, or of the combined Comanche and Coahuila series. In Southern Mississippi, some Lower Cretaceous groups and formations can be recognized, by electric and lithologic characteristics, as being equivalent to units in Louisiana where the stratigraphic sequence is more firmly established. Key beds of the Lower Cretaceous of southern Mississippi are the Washita and Fredericksburg limestones and the Ferry Lake anhydrite. The Ferry Lake anhydrite was not deposited northeast of a line from central Issaquena County to northeast Greene County. Washita and Fredericksburg limestones are not present north of a line between Claiborne County and Greene County. North of this line Washita and Fredericksburg rocks are clastic, and are difficult to recognize because of the absence of limestones and the lithologic similiarity between them and the overlying and underlying strata. Ten structures in Mississippi have produced oil or gas from Lower Cretaceous sediments. Favorable reservoir rocks and good structures exist in Mississippi, hence additional Lower Cretaceous exploration is justified.

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Figure 1 (unnumbered) CORRELATION OF LOWER CRETACEOUS OF MISSISSIPPI WITH OTHER AREAS

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Figure 2. (unnumbered) UPPER CRETACEOUS CORRELATION CHART

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