Mapping the structure lying in Cheyenne County, Kansas, and Yuma County, Colorado, now being tested by the Phillips Petroleum Company, required the development and use of methods which are of special interest at this time, as they will probably be used to map other structures in the same region presenting similar problems.

The surface formations in the Rosencranz area include sandstones, sandy limestones, and clays of Tertiary age and the Pierre shale of the Upper Cretaceous system. The Tertiary formations have not been proved to be reliable indicators of the subsurface structure in this region; consequently, it was necessary to...

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