Bureau of Reclamation made many helpful suggestions and criticisms, both as to the kinds of data to be gathered during the field investigations, and as to the organization of that data in the tables accompanying the report. The whole hearted cooperation of C. F. Withington, R. G. Young, J. T. Robison, D. L. Emerson, and Will Ryselka as assistants during the field investigations assured completion of the work in the single season allotted. Existing map information, both published and unpublished, was utilized where available, and grateful acknowledgement is due the many workers who contributed. Specific reference to the source of such data is made in the body of this report. i Sincere thanks are also due our several colleagues of the U. S. Geological Survey who have criticized the manuscript, especially E. B. Eckcl, under whose general supervision the investigation was conducted.
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