ID on a rock.

[Tom F]

The bottom of the rock is smooth like it has been in running water for a long time. The side with the depression is rough. The depression is about 1/4 inch deep. Don't know where it came from. It was found in a box of arrowheads



Thanks for any information.

 

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[huntsman53]

I have no idea but it looks like a petrified shell of a Buckeye


Frank

 

[curious kat]

...maybe a nodule concretion of some sort that's been worn/polished on the outside?