I agree with SAVANNAH RIVER (same as APPALACHIAN). Long stem variation?
-Medium to Large Broad Blade
-Quartzite is common.
-Commonly Concave/Bifurcated at Base of Stem
-Square To Tapered Shoulders
-Stems are Narrow to Broad and commonly Narrowing toward the Base
-Bases are sometimes ground
Middle to Late Archaic into the Woodland Period. (Reference:Overstreet)