Theropod Track

A theropod track, first noted by Matt Mossbrucker and later described by Dr. Martin Lockley, came from the top layer of sandstone at the Bone Site, 50 yards north. During road construction in 1937, the boulder bearing the track was removed from the hillside and later moved to this location in 2013. Its sharp toe impressions identify it as a theropod, and because Allosaurus teeth and bones were found here in 1877, the footprint may have been made by a young Allosaurus, though Torvosaurus or Ceratosaurus are also possibilities. The footprint’s 9-inch length gives an estimated leg length of 45 inches, and for a Jurassic theropod that indicates a head-to-tail length of 135 inches, or 11.5 feet.

Colorado · United States