Campbelloceras

genus

Sensitive Classification

Fossils are sensitive in nature and should not be collected unless it is done legally and responsibly. Vertebrate fossils are illegal to collect on public lands.

On the Web

On Wikipedia

Campbelloceras is a tarphyceratid nautiloid known from the Lower Ordovician, Upper Canadian Epoch of North America, where it is widespread. Campbelloceras was named by Ulrich and Foerste in 1936. The shell of Campbelloceras has a circular whorl section, only slightly impressed, and a siphuncle that is close to the venter in all growth stages. Campbelloceras differs from Tarphyceras in that the rate of expansion is greater, the siphuncle is proportionally largers, and an impression is shallower. Campbelloceras may have given rise to the barrandeocerid Plectoceras (Plectoceratidae) through simplification of the connecting rings, and to Tarphyceras through tighter coiling, development of a deeper impression, and reduction in the size of the siphuncle. Campbelloceras may be conceivably…