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Trying to ID this cephalopod found in Silurian limestone in northern Illinois. My guess is it's a Spyroceras? In situ pic: Part of the cast glued together: Wavy lines in aquamarine colors and some pyritization/marcasite. I am clearly missing some pieces, but when fit together in the sarcophagus, it measures over 14". The entire cephalopod probably measured at least two feet or more, I'm guessing...