Natural? Or man made?

[mn9000]

I have a new area I'm hunting & im wondering if I'm looking in the right spot yet or not. I can't quite tell if this stone ended up shaped like this naturally over time or if it's been worked by native Americans. I'm leaning towards NA but not 100% sold yet....

 

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[NCPeaches]

It's hard to tell for me too. I have a piece similar but is thick, maybe part of a core or a preform.

 

[rock]

If its anything na related it would be a core.

 

[DigIron2]

I would guess a core too, Its not natural.