Figure 45.--Trimetrogon (oblique) aerial photograph 410-R-219 taken on 23 January 1945 showing three bands of tephra on Glaciar Chico; the uppermost one (1) is definitely below the firn line. The ice-capped mountain on the right is Cerro Gorra Blanca.
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U.S. Geological Survey, U.S.Department of the Interior