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Ctenochasma is distinguished mainly by its numerous (over 400 in adults) long
Scientific Name: Archaeotherium (megachoerus) zygomaticus Location: South Dakota
74x24x21 inches 137 pounds
4---pliosaur tooth---jurassic
Aerial Photography and Aerial Infrared Photography
Homotelus bromidensis, trilobite (Replica) Tyrannosaurus Rex Ctenochasma is distinguished mainly byThis trilobite mortality plate is from the Ordovician of Oklahoma. Trilobites are very well known, and possibly the second most famous fossil group after the dinosaurs with some 15,000 known species. Trilobites are extinct arthropods that form the class Trilobita. They appeared at the start of the Cambrian period and flourished throughout the lower Paleozoic era before beginning a drawn out decline to extinction when the last of the trilobites
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