Orthoceras Fossil Blade Pendant

Orthoceras ("straight horn") is a genus of extinct nautiloid cephalopod. This genus is sometimes called Orthoceratites. Orthoceras can be found in sizes ranging from less than a centimetre to more than 14 feet long. Orthoceras is the ancestor of Ammonites and squids.

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Orthoceras, otherwise known as "straight horn" is a genus of extinct nautiloid cephalopod. Orthoceras fossils occur in any marine rock, especially in limestone.

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