Genuine Orthoceras Plate, Two Species Spheres This specimen has sharp
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Genuine Orthoceras Plate, Two Species Spheres This specimen has sharpTwo Orthoceras fossils found in a sea bed matrix. Orthoceras ("straight horn") had a slender, elongated shell, with the middle of the body chamber transversely constricted, and a subcentral orthochoanitic siphuncle. The surface is ornamented by a network of fine lirae. 250 to 750 million years ago, the orthoceras mollusk lived in abundance during the Paleozoic Era. Orthoceras is a member of the class Cephalopoda and is closely related to the extinct
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