The purpose of this paper is to outline the regional geologic features of the McAlester-Arkansas Valley basin. Much of the material for the paper has been consolidated from published papers of the U. S. Geological Survey, Oklahoma Geological Survey, and Bulletins of the A.A.P.G. This material has been brought up to date and data added by each author together with considerable information generously supplied by individuals and companies.

The pre-Pennsylvanian stratigraphy, based on available data from the comparatively few deep wells, is shown to be generally similar to that of the Seminole uplift, but minor differences that may be significant are pointed out. The stratigraphy of the Pennsylvanian of the flank of the basin and the thickening and lithologic changes toward the center of the basin are shown by sections and an isopachous map.

The generalized regional structure is shown by a structure contour map of the top of the Wapanucka-Morrow with the principal known faults and folds added. The distribution of producing oil and gas fields, both geographically and with regard to producing zones, is shown and discussed. A carbon ratio map based on all available coal analyses is shown and available porosity data on potential producing zones are presented. The relationship of these factors to present production and future productive possibilities is discussed.

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