What is it

[Lala76]

Found in the river, it's smooth all over except in one spot. I had originally posted in a different forum and though I had posted it here as well, but apparently it didn't post here.

 

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[Tdog]

That looks like battering evidence to me. It was used to crush or pulverize something--like a pestle. I'd say it's a naturally shaped piece that was found and used as a pestle.

 

[tnmudman]

I agree with Tdog, thats exactly what I thought.

 

[gilmerman]

A well used tool,I agree it was picked up and put to work.

 

[sandchip]

May be naturally formed, but I agree that it could've been used as stated above. The tapered end could've even been fitted into a socketed handle like a celt and used to beat hell out of something.