ID help on cephalopod from Kansas City Winterset

[KCMOfossil]

I found this in the Winterset Limestone of the Pennsylvanian system, Kansas City group near Raytown, MO.  The matrix was quite oolithic.  You may notice from the pictures that I had some trouble reassembling and gluing it after it fell apart, and it may be missing a bit of the small end.  It looks to me like an internal mold of an evolutely coiled cephalopod.  It is about 2 cm x 1.5 cm.  Any ID help will be appreciated.

 

[Bullsnake]

This may help:

http://www.thefossilforum.com/index.php?/topic/33279-some-pennsylvanian-nautiloids/

@Missourian

[KCMOfossil]

Thanks, Bullsnake, for the link.  Comparing the photos in the link, my specimen looks similar to Solenochilus.  

 

Russ

1 minute ago, KCMOfossil said:

Solenochilus

Oops, I mean Domatoceras.

[izak_]

No idea on its ID, but very nice specimen!

[Missourian]

Nice specimen.

 

It probably is Metaoceras. It is the most common type in the Winterset, and its first whorl is loosely coiled.

[KCMOfossil]

Thanks, Missourian.  I have been fascinated by the materials I have found near Gregory and I-435.  The oolithic matrix makes for some interesting preservations.  Do you agree that this is an internal mold?  By the way, I think you skipped a keystroke; you meant to type Metacoceras.  Thanks for the ID help.

 

Russ

[Missourian]

2 hours ago, KCMOfossil said:

Thanks, Missourian.  I have been fascinated by the materials I have found near Gregory and I-435.  The oolithic matrix makes for some interesting preservations.  Do you agree that this is an internal mold?  By the way, I think you skipped a keystroke; you meant to type Metacoceras.  Thanks for the ID help.

 

Yes, Metacoceras mispeled.

 

And yes, the cephalopods are often preserved as internal molds.