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Is This a Nautiloid Cephalopod?


Sinosauropteryx prima

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Hi everyone. The other day I found this interesting impression in a rock. When I first saw it, I noticed that it looked similar to the sutures inside a cephalopod shell, but I thought it may have been wishful thinking and was probably something else. I took it home and asked on Reddit, and another user also said that they believed it was probably a nautiloid shell. So, I'm coming here for final verification. Is this a nautiloid shell?

 

The fossil was found in northwest Michigan, along Lake Michigan.

 

Thanks in advance!

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ditto for me also

"Absence of evidence is not evidence of absence"_ Carl Sagen

No trees were killed in this posting......however, many innocent electrons were diverted from where they originally intended to go.

" I think, therefore I collect fossils." _ Me

"When you have eliminated the impossible, whatever remains, however improbable, must be the truth."__S. Holmes

"can't we all just get along?" Jack Nicholson from Mars Attacks

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20 hours ago, jpc said:

I think so

 

20 hours ago, ClearLake said:

Probably so

 

19 hours ago, Tidgy's Dad said:

Orthoconic nautiloid for me, too.

 

18 hours ago, Herb said:

ditto for me also

Thank you guys!

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