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A current list of the official state fossil designations by state with information and photos.

Mosasaurs are very large extinct marine reptiles with some species reaching lengths of over 50 feet and are considered to be some of the fearsome predators to ever inhabit our oceans.

Triceratops was a giant plant-eating dinosaur with three horns and a bony frill. Learn about its anatomy, lifestyle, and fossils.

Spinosaurus rewrote the rules of dinosaur life. Discover its massive size, river-hunting lifestyle, sail, fossils, and aquatic dinosaur debate.

Discover the fascinating world of ammonites—prehistoric cephalopods with iconic spiral shells. Learn their biology, evolution, and fossil significance.