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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 Ellersieck, Inyo, Curtis, S.M., Mayfield, C.F., and Tailleur, I.L., 1990, Reconnaissance geologic map of the De Long Mountains A-2 and B-2 quadrangles and part of the C-2 quadrangle, Alaska: U.S. Geological Survey Miscellaneous Investigations Series Map I-1931, 2 sheets, scale 1:63,360.
Symbol ?
Unit name None
Description Shown not colored labeled with a question mark.

Correlated geologic units

Label bu
Description Bedrock of unknown type or age
Geologic age Proterozoic to Phanerozoic
Geologic setting Undetermined
Lithology Form Importance
Igneous Indeterminate, major
Metamorphic Indeterminate, major
Sedimentary Bed Indeterminate, major