Geology of Rat Island Aleutian Islands Alaska.pdfVIP

Geology of Rat Island Aleutian Islands Alaska By RICHARD Q. LEWIS, WILLIS H. NELSON, and HOWARD A. POWERS INVESTIGATIONS OF ALASKAN VOLCANOES GEOLOGICAL SURVEY BULLETIN 1028-Q Prepared in cooperation with the Office, Chief of Engineers, U.S. Army UNITED STATES GOVERNMENT PRINTING OFFICE, WASHINGTON : 1960 UNITED STATES DEPARTMENT OF THE INTERIOR FRED A. SEATON, Secretary GEOLOGICAL SURVEY Thomas B. Nolan, Director For sale by the Superintendent of Documents, U.S. Goyernment Printing Office Washington 25, D.C. - Price 35 cents (paper cover) PREFACE In October 1945 the War Department (now Department of the Army) requested the Geological Survey to undertake a program of volcano investigations in the Aleutian Islands Alaska Peninsula area. The first field studies, under general direction of G. D. Robin- son, were begun as soon as weather permitted in the spring of 1946. The results of the first years work in the field, laboratory, and library were assembled hastily as two administrative reports. Part of the data was published in 1950 in Geological Survey Bulletin 974^-B, Volcanic Activity in the Aleutian Arc, by Robert R. Coats. The remainder of the data has been revised for publication in Bulletin 1028. The investigations of 1946 were supported almost entirely by the Military Intelligence Division of the Office, Chief of Engineers, U.S. Army. The Geological Survey is indebted to the Office, Chief of Engineers, for its early recognition of the value of geologic studies in the Aleutian region, which made this report possible, and for its con- tinuing support.