aek 302 Posted December 13, 2016 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... Share this post Link to post Share on other sites
Fossildude19 14,817 Posted December 13, 2016 Spyroceras was a Devonian genus of nautiloid - yours looks like Dawsonoceras, I think. IMAGES HERE. Neat find. Regards, Share this post Link to post Share on other sites
FossilDAWG 5,840 Posted December 13, 2016 I agree with Dawsonoceras. What do you mean by "sarcophagous"? Don Share this post Link to post Share on other sites
aek 302 Posted December 13, 2016 1 hour ago, FossilDAWG said: I agree with Dawsonoceras. What do you mean by "sarcophagous"? Don It's just a description of mold and cast pieces that fit together like a stone "sarcophagus"... Share this post Link to post Share on other sites
aek 302 Posted December 13, 2016 Thanks for the help, I really appreciate it! Share this post Link to post Share on other sites
Max-fossils 2,075 Posted December 13, 2016 When I look up Dawsonoceras and Spyroceras, the first one proposed by Tim does indeed seem like a better option. I don't really know what else it could be, but one thing that I do know is that it is beautiful! Best regards, Max Share this post Link to post Share on other sites
