Did you find this in Southeast Alabama, Southwest Georgia, or the Panhandle of Florida where the three states join?
It looks like an un-notched type 2 Boggy Branch.
I'd call that an almost-finished preform, before notching or stemming took place.
I don't. As a flintknapper, I can tell you that thinning the base like that is the first preparation for notching or stemming. Also, it's still missing the final runs of pressure flaking to straighten, center, and sharpen the edges.I think that the fact that the base is beveled indicates that the piece is finished as is.
Grinding the thin edges is standard prep before pressure flaking, notching, or stemming.The base appears to be ground, if that matters at all.
Anyway, thanks for the info guys.