This study has been undertaken partly because the geology of Montana is of immediate interest to many petroleum geologists, and partly because it offers an unusually favorable opportunity to study the operation of great deformational forces and to test the extent to which subsurface conditions and general structural relationships can be predicted from a quantitative study of the geologic structure exhibited by the surface rocks of a large area. Such a study of land areas requires the construction of a structure-contour map, as the ordinary areal geologic map fails to give a definite idea of the relative magnitude and shape...

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