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The structural geologist is ever confronted by the problem of the origin of the geologic features with which he deals. An understanding of their fundamental causes permits a better interpretation of their significance, which iJ?studies of natural resources, such as oil and gas, has a direct economic bearing. In regions where the rock folds and faults are of large magnitude the structural mechanics are generally apparent, at least in part, but in the MidContinent field, where but few of the anticlines and faults represent elevations of more than 200 feet, the origin of these fea.tures is more obscure. These small rock folds and fractures have commonly been considered the distant effects of forces originating in the Ozark Mountains, the dominating structural feature of the region, but the difficulty of applying this explanation to the features that have come under the writer's observation has led to other considerations, which are presented in this ·paper. The need of understanding the origin and mechanics of the structural features in the MidContinent oil and gas field may be inferred from the fact that much of the oil and gas in this region occurs in localities where the structure of the containing rocks is favorable for its accumulation-that is, where there are anticlinal or domal flexures. In searching for new oil and gas pools it is therefore of paramount importance not only to know the structure of the surface rocks in the regions to be prospected but also to understand how the structural features exposed at the surface may differ from those which govern the accumulation of oil and gas in the deep-lying strata. In addition to the anticlines and domes there are, in places, many faults of the en echelon or offset type, grouped into remarkable parallel belts or series, the study of which suggested the fundamental principles on which the present discussion is based. Still another geologic feature of considerable significance in this region is a buried " granite ridge" trending northeastward from Butler County, Kans., to Pawnee County, Nebr. The alinements of these three features-the major anticlines, the fault belts, and the buried "granite ridge "-are remarkably parallel, and to the writer this parallelism indicates a genetic relationship. It is the purpose of this paper to point out this relationship and to present an interpretation of its meaning.

The origin of the faults, anticlines, and buried "granite ridge" of the northern part of the Mid-Continent oil and gas field