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Bluff Springs Granite

Bluff Springs Granite - leucocratic quartz diorite (tonalite) to quartz monzonite or trondhjemite, locally foliated.
State Alabama
Name Bluff Springs Granite
Geologic age Precambrian to Paleozoic
Comments tentative zircon age of 366 +/- 21 Ma (ref. AL003) (Devonian-Mississippian)
Primary rock type tonalite
Secondary rock type quartz monzonite
Other rock types trondhjemite
Lithologic constituents
Map references
Szabo, M. W., Osborne, E. W., Copeland, C. W. Jr., Neathery; T. L., 1988, Geologic Map of Alabama, Geological Survey of Alabama Special Map 220, scale 1:250,000.
Unit references
Szabo, M. W., Osborne, E. W., Copeland, C. W. Jr., Neathery; T. L., 1988, Geologic Map of Alabama, Geological Survey of Alabama Special Map 220, scale 1:250,000.
USGS Geologic Names Lexicon (GEOLEX)
Russell, G.S., Odom, A.L., and Russell, C.W., 1987, Uranium-lead and rubidium-strontium isotopic evidence for the age and origin of granitic rocks in the northern Alabama Piedmont, IN Drummond, M.S., and Green, N.L., eds., Granites of Alabama: Alabama Geological Survey Special Publication, no. 2, p. 239-249.
Counties Clay - Randolph - Tallapoosa