[1]The X pumice occurs as scattered fragments and does not form a continuous layer. [2]Ages of more than 150 and less than 6,000 years cited in this report are based on radiocarbon determinations which have been corrected by the use of a C?? half life of 5,730 years and for variations in atmospheric C?? (H. E. Suess, written communication to Meyer Rubin, 1968). [3]For more information about glaciers read “Glaciers” by Robert P. Sharp, published in 1960 by the University of Oregon at Eugene. DEPARTMENT OF THE INTERIOR · MARCH 3, 1849
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