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Map Releases

Our programs produce accurate geologic maps and 3-D geologic frameworks that provide critical data for sustaining and improving the quality of life and economic vitality of the Nation. 

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Preliminary geologic map of the northeastern part of the Tanana quadrangle, Alaska

Mapping is based on both ground observations and aerial observations from a helicopter, August 11-19 and September 1-5, 1970, and supplemented by interpretation from aerial photographs. Bedrock geology chiefly by R.M. Chapman, and surficial geology chiefly by W.E. Yeend.