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Procaimanoidea, Green River, Alligator Skeleton

This is one of the best preserved fossil alligators found in the Green River Formation (GRF). The GRF is one of the most important fossil sites in the world for understanding the Eocene. The GRF is located in western Colorado, eastern Utah and southwestern Wyoming. Radiometric dating puts the GRF at 49.7 to 50.7 million years and lasting less than 1/2 million years. Approximately 60 vertebrate taxa have been found at in the GRF, including fish, reptiles, birds and mammals. Eleven species of reptiles have been found, including one species of snake. Invertebrate fossils are abundant, with remnants of snails and insects being common. The plant fossils, including many reeds, leaves and wood specimens, are also very prevalent at Green River.