Orthoceras Sculpture Fossil from Paleozoic Period 400million years + (18-20cm)
A small Orthoceras Sculpture, approximately 18-20cms tall. Orthoceras (straight horn) is a genus of extinct nautiloid cephalopod. This genus is sometimes called Orthoceratites. These fossils are common and have a global distribution, occurring in any marine rock, especially limestones. These are slender, elongated shells with the middle of the body chamber transversely constricted, and a sub central orthochoanitic siphuncle. The surface is ornamented by a network of fine lirae. Many other very similar species are included under the genus Michelinoceras. Although it has an external, chambered shell like the Nautilus, Orthoceras is probably more closely related to coleoids.