Until the Humble Oil and Refining Company drilled its McFaddin State No. A-1, 5,300 feet off the coast of Jefferson County, Texas, on the McFaddin Beach prospect (Fig. 1), the only known material of Cretaceous age encountered on the Gulf Coast salt domes was reported by Morrison3 from the limestone cap rock of the South Liberty salt dome (Fig. 1), Liberty County, Texas.

During the course of drilling McFaddin State No. A-1, which was completed, April 6, 1938, 25 feet of hard, light to dull gray, argillaceous chalk was cored. Its physical characteristics are very...

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