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Please help identifying this fossil.


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I found this in the sangamon river by Decatur Illinois in Macon county. It was found in what looked like a glacial depost in the river. I don't think it is a brachiopod as the shape doesn't quite look right. I think it might be the tail of trilobite.





Edited by Godrel
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Hello. Nice find.

This is the pygidium of a Dalmantid trilobite. 

Not sure of genus or species, but @piranha  should be able to figure this out.  :)


Cropped, brightened, and rotated: 






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