Orthoceras or "straight horn" is a genus of extinct nautiloid, which lived from the Ordivician to Triassic (251.4 to 390 Ma) it, is a cephalopod and is also called Orthoceratites. Orthoceras fossils are common and have a global distribution, occurring in any marine rock, especially limestones. These are slender, elongate shells with the middle of the body chamber transversely constricted, and a subcentral siphuncle. The surface is ornamented by a network of fine lirae. Although it has an external chambered shell like the Nautilus, Orthoceras is probably more closely related to coleoids. 
I really like using the orthoceras fossil because it goes very well with designs in black to red to white. With the pendants one side is polished and shows the squid fossils, the other usually left a little raw to show sort of a before and after of the pendants.
In this design I’ve used a nice large orthoceras fossil and mixed it with smooth onyx stones, pewter silver textured square beads, Swarvoski Black Cosmo Crystals, and red coral disks.
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