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That is a sea urchin (echinoid) or at least part of one. the pattern of plates is fairly distinctive. 2 rows of small plates alternating with 2 rows of large plates. I am not familiar enough with urchin phylogeny to give you species but you might be able ot get it from the biology stack.


Its not a fossil, it is just a septarian concretion. They come in a wide array of shapes and sizes but the crack pattern and crack fill is a dead giveaway.

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