290 R. S. TARR AND LAWRENCE MARTIN 
INTRODUCTION 
The glaciation of the interior of Alaska forms a striking con- 
trast with that of the coast, where the glacial erosion forms pre- 
dominate, the deposits being largely under water. The interior, 
between the coast ranges and the Endicott-Rocky Mountain system, 
where the National Geographic Society’s parties made some 
studies in 1910 and 1g1t, has extensive glacial deposits of the con- 
tinental type, similar to those of United States, and previously 
described in part by Dawson, McConnell, Russell, Hayes, Spurr, 
Schrader, Mendenhall, Brooks, and many others. From 1867, 
when Dall? first announced the absence of glaciation on the middle 
and lower Yukon, to 1906, when Brooks? summarized the knowl- 
edge of glaciation in Alaska, and continuing to the present time, 
there has been an increasing amount of specific information con- 
cerning the glaciation of the interior of Alaska. Most of this 
material has been gathered by the geologists of the Alaska Division 
of the U.S. Geological Survey. 
In this paper it is proposed merely to call attention to the avail- 
ability of this information and to emphasize the conditions in 
one of the large areas of glacial deposits of the continental type— 
the Upper Copper River valley—where we made our observations 
in toro and 1911. Here one type of deposit derived from the 
glacial drift, hitherto not described specifically from Alaska— 
wind-blown loess or eolian silt—occurs in considerable amount, 
and is still being deposited. 
CONTINENTAL DEPOSITS IN ALASKA 
The areas on the coast of Alaska where glacial deposits occur 
are relatively small—(a) 1,600 square miles east of Yakutat Bay, 
(b) 16,000 square miles in the Cook Inlet-Susitna valley region 
(perhaps to be considered an interior area), and (c) smaller areas. 
possible errors of interpretation. Professor J. B. Woodworth has been good enough 
to read and criticize the manuscript. 
Read before the Geological Society of America, December 28, rort. 
Published by permission of Henry Gannett, Chairman of the Research Committee 
of the National Geographic Society of Washington. 
t Amer. Journ. Sci., Second Series, Vol. XLV (1868), 99. 
2 Prof. Paper 45, U.S. Geol. Survey (1906), pp. 244-49. 
