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  3. Geologic map of Alaska
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Bedrock of unknown type or age or areas not mapped

Unit symbol: bu
Age range unknown (1600 to 1.806 Ma)
Lithology: Unknown
Group name: Bedrock of unknown type or age or areas not mapped
Bedrock of unknown type or age or areas not mapped

Source map information

Source map Brew, D.A., and Ford, A.B., 1985, Preliminary reconnaissance geologic map of the Juneau, Taku River, Atlin, and part of the Skagway 1:250,000 quadrangles southeastern Alaska: U.S. Geological Survey Open-File Report 85-395, pamphlet, 23 p., 2 sheets, scale 1:250,000.
Symbol nm
Unit name Not mapped

Correlated geologic units

Label nm
Description Areas not to be filled that lie within coverages, typically not mapped
Geologic setting Undetermined