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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:

 

IMAG8019.jpg

 

Part of the cast glued together:

 

IMAG8356.jpg

 

IMAG8354.jpg

 

IMAG8353.jpg

 

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... 

 

IMAG8361.jpg

 

IMAG8355.jpg

 

 

 

 

 

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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"...

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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

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