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4 million years ago
Crinoids are echinoderms related to starfish
Charnia is a highly significant fossil for several reasons
The location of the eyes and nostrils on the surface of the skull suggest that this animal may have quietly laid on the bottom of pools or rivers waiting for food to get close
Niobrara County
Mixosaurus cornalianus, Ichthyosaurs Baryonyx 4 million years agoMixosaurus is an extinct genus of ichthyosaur. Fossils of Mixosaurus have been found all over the world China, Timor, Indonesia, Italy, Spitsbergen, Svalbard, Canada, Alaska, and Nevada. It was named in 1887 by George H. Baur. The name means "Mixed Lizard", and was chosen because it appears to have been a transitional form between the eel shaped ichthyosaurs such as Cymbospondylus and the later dolphin shaped ichthyosaurs, such as Ichthyosaurus.
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