The
Lists
The following
lists are of all fossil cephalopods I know of in Utah's rocks.
This is probably not an all inclusive list, but the most
common and those described in the literature are listed. I
believe there are a lot more fossil cephalopods from the Lower
Ordovician, but most are fragmentary or poorly preserved so good
specimens will be needed. There may be more in the Silurian
rocks but they will be extremely rare, likewise for the
Devonian. There maybe some from the Pennsylvanian, more from the
Permian and Cretaceous, but I have yet to find either references or
fossils from these periods. The first list is biostratigraphic,
with taxa arranged by system, series, stage, biozone and formation. The list of references is a
mixture of Utah cephalopod references and some used for identification
purposes.