Editing Belemnoidea (section)

==Occurrence==
Belemnoids were numerous during the [[Jurassic]] and [[Cretaceous]] periods, and their [[fossil]]s are abundant in [[Mesozoic]] marine rocks, often accompanying their cousins the [[ammonite]]s. The belemnoids become extinct at the end of the Cretaceous period along with the ammonites. The belemnoids' origin lies within the [[Bactritida|bactritoid]] nautiloids, which date from the [[Devonian]] period; well-formed belemnoid guards can be found in rocks dating from the [[Mississippian age|Mississippian]] (or Early [[Carboniferous]]) onward through the Cretaceous. Other fossil [[cephalopod]]s include [[baculite]]s, [[nautiloid]]s and [[goniatite]]s.