Peroniceras

Architeuthoceras

Architeuthis
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Peroniceras haasi? from the Mancos Shale in Utah. Late Cretaceous (Coniacian) Scaphites preventricosus Zone. The inner whorls are broken and shifted so I dont think any more prep would help. Just something to post until some of this snow melts and I can get out and look for more. :boohoo:
 

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Nice find Kevin, as ever!

That ammonite has a strongly defined keel. I wonder if that feature helped maintain directional stability in the water and acted as streamlining to a limited extent?
 

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