Crinoid or rock?

[PennyG]

Found this on the shore of Lake Michigan yesterday, Illinois. At first I thought it was a crinoid fossil, however, I've never found one like this. It could possibly be a rock that became worn like this and just so happens to have a perfect hole in the middle.
Any ideas? It's a little larger than a quarter and about an inch tall .

 

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[PennyG]

Closer pic of some sort of etching?