A-C. Orthoceras scabridum Angelin, 1880. A. Median section of a

Orthoceras: Amazing Nautiloid hunter of The Paleozoic Era

A-C. Orthoceras scabridum Angelin, 1880. A. Median section of a septal

Orthoceras Fossil Specimen - 500 million years old

PDF) Connecting ring structure and its significance for classification of the Orthoceratid Cephalopods

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Orthoclase - Wikipedia

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WatanGems 237.4g, 7.1x2x0.8, Fossils Orthoceras (Straight Horn) Squid Polished Mineral, Specimen, Nautiloid Cephalopod Paleozoic, Decor

PDF) Soft−tissue attachments in orthocerid and bactritid cephalopods from the Early and Middle Devonian of Germany and Morocco