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Unusual erosion

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Can I take a crack at it?

It looks like that rock was against another rock and had some chemistry. They kind of bonded over the years and cemented together. Then mechanical erosion broke them apart. That cement they created between them was a bit tougher than the host rock and burnished up. You are seeing the broken joint between this and another rock.

That is what I would say caused that spot on your rock.

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