This paper is concerned with an area of 11,000 square miles in central Louisiana. Facies changes and thickening of the section make correlation with updip equivalents difficult. The estimated combined maximum thicknesses of Gulfian and Comanchean beds in southeastern Avoyelles Parish is more than 15,000 feet.

The most prominent structural features that affected deposition were the Sabine uplift and the LaSalle arch. The dip is steep on the south flanks of both. South of them, the dip ranges from 150 to 200 feet per mile toward the Gulf. The northern edge of the central Louisiana area is believed to have acted as a hinge line between a platform area on the north and a basin on the south.

A sandstone-limestone percentage map of Hosston sediments indicates that potential Hosston sandstone reservoirs may be present in Caldwell, Richland, and Franklin Parishes. There may be a reef of Hosston age across southern Vernon, Rapides, and Avoyelles Parishes.

Potential reef and stratigraphic traps are expected to be present in the Glen Rose of central Louisiana. Although shallow-water platform limestones of Washita-Fredericksburg age may have culminated southward in a structurally higher reef complex along the outer edge of the southern platform, post-Comanchean uplift and erosion probably removed this objective section.

The zero line of porous sand in the Tuscaloosa runs diagonally across Louisiana from northeast DeSoto to northern Avoyelles Parishes. South and west of this line, little porous sand can be expected to be present in the Tuscaloosa section. The best potentials for Austin and Taylor production are in the form of faulted chalks. Sediments of Navarro age are absent in this area.

The calculated volume of ultimate recoverable Cretaceous oil in North Louisiana is 1,760 MM barrels, or approximately 117,000 barrels per cubic mile. Based on this figure, a total of 819 MM barrels of ultimate recoverable Cretaceous oil are expected to be present in central Louisiana.

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