The Sedgwick basin is a moderate-size basinal structure, approximately 10-12,000 sq. mi. located in south-central Kansas. The basin is bounded on the east by the Nemaha anticline and on the west by the Pratt anticline. It is actually an embayment connected to a major Oklahoma structural basin. The northern boundary is poorly defined. It is separated from the Salina basin by lithologic changes within the rock section. These changes are the primary causes of a large number of producing zones.

This paper deals with past and future prospects of the area with respect to these changes in lithologic types.

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