Bifurcate? Come on experts, do your thing

[knapper1492]

I’ve posted this one before, but I wanted to focus on the base. It’s quite small, about an inch but to me the base looks bifurcate. The one ear is pretty evident (to me) similar to a Maccorkle. The basal thinning is only in the center. Other ear is broken. From Northern Illinois. Any ideas?

 

[newnan man]

That's pretty.beat up but probably a bifurcate.

 

[Treasure_Hunter]

Looks like damaged bifurcate...