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It looks like a Stromatolite IMO.

It is better to keep your mouth closed and let people think you are a fool than to open it and remove all doubt

 

-Mark Twain

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2 minutes ago, Righteous said:

Don’t see any of the bark on the outside of the rings so I don’t think it’s wood

Many pieces of Petrified wood weren't preserved with bark. However, I agree that it isn't wood.

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It is better to keep your mouth closed and let people think you are a fool than to open it and remove all doubt

 

-Mark Twain

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If the texture is fine, almost glassy, banded chert would my thought as well. If it's softer and more porous layered concretion would be more in line.

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