Please help identify.. Fossil?

[Giangiul]

I found this in the creek behind my parent's home in SE Michigan. Can you please help me identify it?

Thank you!

 

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[Kray Gelder]

Interesting rock, G. I'm not seeing any plant or animal parts. It looks like weathered limestone. The weird line pattern looks like a calcite drip line pattern deposited onto it. Or not.

 

[Mine Shaft]

I don't see any fossil's, gotta keep looking.