The stratigraphy of the Carrizo-Wilcox is very complex and numerous facies occur within the group. This report shows the relationship between the various facies and the producing fields within the area of interest. Stratigraphic studies are becoming increasingly important in the exploration for oil and gas and a practical application of such a study is presented here.

The subsurface section can be divided into three major subdivisions, of which two are rock units composed almost entirely of non-marine sediments, and the third is further subdivided into time-rock units composed of alternating marine, transitional, and nonmarine sediments. Generalized correlations can be made between the surface outcrop and the subsurface section. The various facies that occur within the subdivisions can be defined and the limits delineated both vertically and horizontally. Many of these facies are economically important. The most significant stratigraphic feature is a large delta which occurs within the lower Carrizo-Wilcox. The effects that these different facies have on production is discussed along with the stratigraphic conditions in some of the more important f elds.

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