Cephalopod Identification Needed !

[minnbuckeye]

This cephalopod was found in a quarry located in Coralville Iowa, so Devonian in origin. I find many straight cephalopods local to my area (SE Minnesota), but am not knowledgeable with Devonian curved cephs. It would be nice to narrow down the species in that I would like to find images of what it would have looked like if whole so that I can attempt to reproduce the missing end. It has worked well with a few straight cephalopods that I included in some displays donated locally. This ceph has bumps on top. That must be important because a few members of our fossil club, though not able to ID, did say it would help a professional in the know make the identification. Thanks for the assistance!

[minnbuckeye]

Another view:

[minnbuckeye]

Here is an example of what I did with a straight cephalopod:

[Al Dente]

It looks like part of Gyroceras.

[minnbuckeye]

Thanks Al , You helped tremendously.

[Diceros]

Loosely-coiled Devonian nautiloid. See: https://www.google.com/search?hl=en&q=Gyroceras&gbv=2&sa=X&oi=image_result_group&ei=vFR0VezdH8LHogSU0oD4Ag&ved=0CBoQsAQ&tbm=isch , and note that the first two images are from the Fossil Forum.

[minnbuckeye]

Once I had a genus to go by, I actually found and copied those exact pictures. Being from Iowa, do you find this type of cephalopod often? It was the first time I saw someone find one in the quarry we explored. Thanks for the assistance.

[howard_l]

The problem with Gryroceras is it was used in the past for a large amount of coiled or semi-coiled nautiloids like orthoceras was used for straight nautiloids. It is still used but most nautiloids that previously used that name now have new genus names.

[howard_l]

The fossil looks like it has nodes on the side of the shell. Hercoceras has similar nodes and is also from the Devonian of Iowa.