Diplomystus dentatus, Green River Fish Iguanodon The tooth comes on a

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The fine grained sediments in these lagoons produced nearly flawless remains of plant and animals which fell into or were washed into them as well as some of their natural residents

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Diplomystus dentatus, Green River Fish Iguanodon The tooth comes on aDiplomystus is a representative of a primitive group of herring like fishes known only from the fossil record. Some Diplomystus fossils have been found that date back to the Late Cretaceous Period, 80 million years ago. This species, Diplomystus dentatus is from the Eocene Epoch and is about 55 million years old. It is found in southwestern Wyoming in the world famous Green River Formation fossil beds. In these beds, layers of fine grained limestone