none too thick

[ridgerunner112]

ie.: interesting throwaway atop the pile

 

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[antmike915]

I want to say natural, groove looks like erosion. I'm not seeing a bit end. Just my opinion; I've never found a hardstone axe before (not available in my areas) but I've seen a few. Others should be along soon with more experience with them to let you know for sure.

 

[newnan man]

All of us would pick that one up and take it home. I agree with Ant, I think it's natural.