GeologyRocks

It's not a fossilised walnut.  It could be a fossil sponge or something similar.  It would help to know where it came from so we can tell what rocks and age it could be.

I've seen one before - and been told what it is, but unfortunately my forgetory has kicked in. Sorry.

John

“Civilisation exists by geological consent, subject to change without notice.” -  Will Durant

It was found in an area just north of Dayton Ohio. I just wondered since it has the same striations of a walnut, same size and the small hole where it would have been attatched to the limb.

I think you have a fossil which is marine in origin since the area I believe is composed of limestone.  Therefore you may have a fossil sponge or crinoid "cup" and the hole you can see would be where it was attached to the sea bed via a stem.  Not a walnut.

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