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Dylan LP
20190730_164258.jpg Found in a bag of ballast!
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Dirty Pete
Hi Dylan,
That looks like what I think is called a primary tubercle of an echinoid (sea urchin) preserved in flint /chert (Cretaceous?). A spine would have been attached to that central socket.

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I agree with Pete, a cidarid plate impression in Cretaceous flint and always a nice find. Search "flint Temnocidaris" for example.
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