The oil and gas development maps of the northern Mid-Continent show the vast number of producing wells and fields in north-central and northeastern Oklahoma and in southeastern Kansas. These are generally described as being old Pennsylvanian pools about which geologists in general know few of the details. This paper is a joint effort of a number of geologists to divide this production into different stratigraphic horizons.

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A series of four maps show where oil and gas are produced from sands in the Pennsylvanian below the base of the Cherokee, in the Cherokee formation itself, in the interval between the top of the Cherokee and the Checkerboard limestone, and in the interval from the Checkerboard limestone to the top of the Pennsylvanian. Cross sections show the position of these sands and units in the stratigraphic column. It is hoped that these maps will furnish additional information on the character and position of these sand bodies, and on the occurrence of oil and gas in them.

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