Triassic Coleoids

[Hajar]

Some details of another one of these.

 

[Architeuthoceras]

These look alot like the endosiphocone of Ordovician Intejocerids, perhaps they are formed in a similar fashion. ???

 

[Hajar]

Interesting; I've never seen one of those. Do you have a photo?

Here attached is a photo revealing part of the "inner orthocone" of a broken Aulacoceras.

 

[Pr0teusUnbound]

thats Aulacoceras? it looks a lot like the nautiloid Kionoceras. #Kionoceras - Wikipedia