possible pestle ?

[Bbmbr]

Found in Stanislaus county. Its about 14" long.

 

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[WannaDig3687]

Not qualified to answer, but does look interesting.

 

[Indian Steve]

I don't think so but post on North American Indian Relics Forum for more informed opinions

 

[Rowdy Yates]

It's a Bar Hammerstone......

HTH,

Rick

 

[bradyboy]

yep - looks like a river rock to me
Brady