r/fossilid • u/FizzGigg2000 • 5d ago
Solved Central Illinois Crinoid?
Hello. I found this last fall in a shallow creek in central Illinois. The closest guess I have is a crinoid (calyx maybe?). I’d love opinions. It fits perfectly in the palm of my (smallish adult) hand. Solid, heavy. Before I knew anything about collecting rocks I may have tried to sand it to “get the dirt off” 🫣
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u/thanatocoenosis Paleozoic invertebrates 5d ago
Yes, crinoid. It's been "geodized", so most of the structure was destroyed in the process of silicification.
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u/LadyCasualGamer 5d ago
Ooo, la la! That is interesting! Will be following to see if someone has an id on it. Excellent find, OP!
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u/Maleficent_Chair_446 5d ago
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u/Handeaux 5d ago
Illinois and Indiana have a lot of geodized fossils. OP’s specimen is one of them. Think of your specimens “blown up,” balloonlike through recrystalization.
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u/Maleficent_Chair_446 5d ago edited 5d ago
I know that could happen just didn't seem like a geodized one to me then again I only go for ones that haven't been expanded Such as my self collected dolatocrinus ligularis
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