Colorado Fossil

Adopted on April 28, 1982.

The Stegosaurus lived in the area we now know as Colorado one hundred and fifty million years ago during the Mesozoic era in the Jurassic period. It is believed that a typical Stegosaurus weighed ten tons though its brain weighed only two and one-half ounces. There are only 6 skeletons of the Stegosaurus on public display in the United States, one of which may be viewed at the Museum of Natural History in Denver. This skeleton was discovered by a teacher and students from Canon City High School

The first Stegosaurus fossil was discovered in Colorado by M. P. Felch in 1877. Stegosaur fossils are widely distributed from the United States to China showing how successful this dinosaur group was.

There are many different types of stegosaur, of which Stegosaurus is the largest. Fossils from three different species of Stegosaurus have now been identified from the Morrison Formation in the western USA. These finds have included complete skeletons and juveniles.
 

Stegosaurus had 17 bony plates that were embedded in its back - the plates ran along the Stegosaurus' back and tail in two rows, and the plates alternated in alignment. The largest of these triangular plates was about 2.5 ft (76 cm) tall and just as long. Stegosaurus also had spikes at the end of its flexible tail (these are called thagomizers).

Although Stegosaurus was about the size of a bus, it had a small head (the size of a horse's head) and a brain that was only the size of a walnut!

Characteristics

Stegosaurus was a herbivorous "bird-hipped" dinosaur, which cropped vegetation with its powerful beaked mouth.

Teeth: a toothless beak, small cheek teeth

Length: 9 meters (30 feet)

Food: plants and leaves

Height: 2.75 meters ( 9 feet)

How it walked: walked on four legs

Weight: 1,400 kilograms (3,000 pounds)

Period: Jurassic

Type of feeder: plant eater (herbivore)