Procaimanoidea, Green River, Alligator Skeleton Compsognathus Starfish have remained relatively unchanged

Starfish have remained relatively unchanged throughout their 500 million year history

Despite its great size

Duckbill ungual

Footprint specimens from the Front Range area include Theropods ranging from the size of a turkey to Tyrannosaurus

Procaimanoidea, Green River, Alligator Skeleton Compsognathus Starfish have remained relatively unchangedThis 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,