FRONT COVER

The front cover is a reduction of part of the new geologic map of Alaska published in 1980 by the U.S. Geological Survey (Beikman, H. M., 1980, Geologic map of Alaska: U.S. Geological Survey Special Map, scale 1:2,500,000, 2 sheets). This multicolored map portrays the areal distribution of almost 200 rock units and indicates the sources of data used in the compilation.