After working on the Red Beds (Chugwater formation) of western Wyoming for four summers, the writer is convinced that some recent investigators are assigning their origin too largely to subaerial forces. He has found proof of such origin in one member about 60 feet in thickness, evidence of æolian origin in another member of about the same thickness, and abundant indications of subaqueous origin for all of the rest.

The writer’s investigations were made during the summers of 1904 and 1905, when he worked on the Red Beds from about 20 miles south to about 35 miles northwest of Lander and examined the exposures about 15 miles north of Rawlins, and in the summers of 1911 and 1913, when the studies were continued from about 25 miles south of Lander to near Dubois, a distance of about 100 miles; but the investigations on the Red Beds were incidental to . . .

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