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Fossilized Nut, Concretion Or ?

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Hello, found this little guy in the Mojave Desert. It is likely a concretion but wanted to get some other opinions on this one. The odd circular center is what is puzzling me.

Couple of photos, let me know your thoughts. Thanks, Eric



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...yes looks like a type of concretion. I find a lot where I am, seems that they start "growing" from a core center. By "growing" I mean building up layer upon layer. Here's some of mine from both sidespost-13912-0-47245500-1388609330_thumb.jpgpost-13912-0-94357700-1388609375_thumb.jpg....

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Yup. Concretion.


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