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D epartmen t of Geology and Geography, M usking um College, N ew Concord , Ohio, U S A.) MARTI N RIVER GLACIER a nd a sm a ll glacier for w hich the informa l n a m e " Sioux G lacier" will be used here (Fig . I ; !at. 600 24' to 60 0 35' N ., long. 143 0 30' to 1440 25' W .) are m antled with la rge q uantities of rock d ebris. A series of p hotographs da ti ng fro m 1938 to 1964 a nd the geom orphic m odifica tions resulting from the A laska n earthq ua ke (27 M arch 1964) suggest rock avalanching as a n origin for much of the superglacial drift.

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The Alaska earthquake of March 27, 1964, caused widespread geomorphic changes in the Martin-Bering Rivers area-900 square miles of uninhabited mountains, alluvial flatlands, and marshes north of the Gulf of Alaska, and east of the Copper River. This area is at lat 60°30' N. and long 144°22' W., 32 miles east of Cordova, and approximately 130 miles east-southeast of the epicenter of the earthquake.

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