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Layered rock?


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Once again found this in our creek in Michigan . It's  Very different from the others I have found. It has different layers on one side, and the other side looks bumpy but isn't.  What could this be? Thanks once again. 



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Chert nodule. :) 

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I agree chert, lol depending on the size you could make some decent arrowheads out of it...

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