ABSTRACT

The Mill Creek graben-syncline is an interesting geologic feature located along the northeast flank of the Tishomingo anticline in southern Oklahoma. The graben is a southeastward extension of the Anadarko basin and the anticline is a southeastern continuation of the Arbuckle mountains. The Pennsylvanian Deese formation is on the outcrop in the graben, Precambrian Tishomingo granite is at the surface at the Tishomingo anticline, and north of the graben the Ordovician Oil Creek formation crops out along the area of study.

An aeromagnetic profile was flown normal to the Mill Creek graben-syncline to determine the configuration of the greatly displaced granite fault blocks. The profile showed changes in the depth of the Precambrian basement from the southwest end of the profile in the Ardmore basin to the northeast end in the Arkoma basin.

A quantitative interpretation of the aeromagnetic profile shows severe overthrusting north of the Tishomingo anticline near the town of Mill Creek, Oklahoma. A sedimentary section in excess of 10,000 feet within and south of the surface expression of the Mill Creek graben-syncline is postulated.