this grindstone came up -rotto tiller

[mojjax]

We had big JD come up & rotto till a spot - this came out of the ground - looks beveled

 

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[Tony in SC]

I think that type stone came from a roller mill instead of a grist mill. It could have worn down like that?

 

[mojjax]

once round ?

 

[Plug N Play]

 

[Noah_D]

View attachment 1841857

I didn't think of that! Good one Plug N Play! One thing, the OP's stone looks a lot smoother as if it is either a different material or it's very worn down. If it was concrete I would think the wearing down of it would have exposed some of the larger pebbles n stuff. IMO.

 

[Indian Steve]

I'm thinking Plug N Play has it. The smooth part is from being poured in a car tire.

 

[mojjax]

It's not cement - it's rock

 

[Anduril]

Part of an enormous knife sharpener?
Or maybe a wheel bearing off the Fred Flinstonemobile?

That's an odd one there, mojjax!
Will be curious to see if this one is ever solved.