Baculite n. : A cephalopod of the extinct genus Baculites, found fossil in the Cretaceous rocks. It is like an uncoiled ammonite.

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Taxonomy
Baculites, shell, chambers, fossils, genus, free encyclopedia, the shells, cephalopods, suture, Late Cretaceous, ammonites, rock, Late Cretaceous period, outer shell, suture line, Fossil range, grandis, western South Dakota.

Defination from the web:
Baculite) Jump to: navigation, search. Baculites. Fossil range: Late Cretaceous ... Baculites ("walking stick rock") is a genus of extinct marine animals in the Phylum Mollusca and Class Cephalopoda. ...