Ibexian Series, Blackhillsian Stage
Zone I Cephalopods


Pictured below are a few I have seen in the informal Calathium member of the Fillmore Formation, in the southern House Range.

Endosiphocone with Calathium
Endocerid? (Endosiphocone) with Calathium

Living Chamber
External mold with filled-in siphuncle and body chamber.  Alot of trilobite parts, but no nautiloid shell...?


Coiled Cephalopod

The body chamber of an unidentified coiled nautiloid


Endocerid 
An Endocerid?


Orthocones

A couple of small Orthocones surrounded with trilobite parts



Plectolites

a small coiled nautiloid found by Marcus Donivan


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