The Wilcox series was initiated approximately 2 years ago as a major, deep objective and the drilling campaign continues unabated. The writer endeavors to analyze these new data in the light of regional stratigraphy and further evaluation of oil potentialities.

A contour map, based on subsea depths to the top of the Wilcox, is offered as evidence on the regional structure of the series.

Eight electrical-log dip sections, including the Claiborne series in addition to the Wilcox, illustrate the electrical character and thickness of the sediments and the relation of Wilcox deposition to that of the younger series. Variations in amount and date of coastal geosynclinal subsidence are discussed. Possible relations of the basal Claiborne or Carrizo formation to the downdip Wilcox sands are considered. Attention is called to the local occurrence of a Discocyclina zone which may have a future value in regional correlations. Coregraphs and a table of porosities and permeabilities of Wilcox sands in several deep wells offer evidence of a downdip economic limit to Wilcox production. Other factors of importance in Wilcox prospecting are discussed.