Need help identifying

[Katybird18]

Found in a creek in parkville Missouri

 

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[The Grim Reaper]

I don't see any evidence of that stone being altered or utilized by man. It's just a natural creek rock.

 

[rock]

Has the rite shape for a Pestle but a creek find is really hard to say for sure. If it was found in a field where you have found points and debitage it would be easier to say.