Paleocadmus is a genus of radula known only from the

Mazon Creek The Mazon Creek fossil beds are a conservation ' found near Morris, in Grundy County, Illinois. The fossils are preserved in ironstone concretions, formed approximately in the mid- Pennsylvanian epoch of the Carboniferous period. These concr ...

biota. It is only known from isolated fossils around a centimetre in length, and a few mm wide (in one instance associated with a possible beak), but its morphology aligns it with the

nautiloid Nautiloids are a group of cephalopods (Mollusca) which originated in the Late Cambrian and are represented today by the living ''Nautilus'' and ''Allonautilus''. Fossil nautiloids are diverse and species rich, with over 2,500 recorded species. Th ...

s, or perhaps the bactritoids or belemnoids.

References

{{Taxonbar, from=Q7127137 Nautiloids