To determine the nature, date, and relative intensity of the earth movements that made up the Laramide orogenic revolution, it is necessary to ascertain the nature and sequence of the movements that took place within a particular, typical, Cordilleran structural unit, such as the Big Horn Basin plus its border ranges. After these factors are known for a typical structural unit, they help to make more readily ascertainable how the series of tectonic happenings in the various Cordilleran intermontane basins were related in space, time, and intensity.

Because of the importance of these objectives, a group of geologists have been collaborating in the Yellowstone-Bighorn region in an endeavor to determine the nature of the earth processes responsible for the physical evolution of that region, and the stages by which its evolutionary development was accomplished.

Specifically, the writer’s particular share in the Big Horn Basin research program . . .

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