There are a large variety of pelecypod molluscs on display in the museum. They are a fairly common fossil in the Pennsylvanian to Cretaceous rocks of the central plains. Some of the fossils on display include large Inoceramus fossils, Gryphaea, Exogyra and a variety of others from the Pennsylvanian Age and younger. In many cases, modern cousins of these molluscs are displayed beside their ancient predecessors. The image below is of a giant Inoceramus shell found in western Kansas.