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
Lithologic constituents
Major
Igneous > Plutonic > Syenitic > Quartz-monzonite
Igneous > Plutonic > Granitic > Tonalite > Trondhjemite
Igneous > Plutonic > Granitic > Tonaliteleucocratic quartz diorite (tonalite)
Comments tentative zircon age of 366 +/- 21 Ma (ref. AL003) (Devonian-Mississippian)
References

Szabo, M.W., Osborne, E.W., Copeland, C.W. Jr., and Neathery, T.L., 1988, Geologic Map of Alabama, Geological Survey of Alabama Special Map 220, scale 1:250,000.

USGS Geologic Names lexicon found at: http://ngmdb.usgs.gov/Geolex/

https://ngmdb.usgs.gov/Geolex/search

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.

NGMDB product
Counties Clay - Randolph - Tallapoosa