Apply Online for the 2014 High Use Season Multi-Day River Permit Lottery
Starting December 1, 2013 through January 31, 2014 , boaters can apply for the lottery for the 2014 high use season multi-day river permits through Recreation.gov. More »
Ely Creek Backcountry Campsites Closed
The Ely Creek backcountry campsites located along the Jones Hole Trail have been closed until further notice due to bear activity in the area. More »
About Allosaurus fragilis:
Allosaurus, meaning "different delicate reptile," is a theropod (meat-eating dinosaur) that probably ate other smaller dinosaurs. Its teeth were up to 3 in (7.6 cm) long and serrated like steak knives for cutting flesh. Adults hunted by overpowering their prey, possibly in small groups. Juvenile Allosaurus relied on their longer limb bones that were better adapted to running in order to hunt smaller vertebrates. Even though Allosaurus grew up to 30 ft (8.5 m) in length, it was not the largest predator of the time. Its sharp teeth and hook-shaped claws did, however, make Allosaurus a nightmare for many creatures of the Jurassic.
Why is Allosaurus fragilis a superstar?
The Allosaurus fragilis skeleton found at Dinosaur National Monument has one of the best skulls of any Late Jurassic predatory dinosaur in the world! Dinosaur skulls are rarely preserved because they are made of very thin bone that is easily crushed. Skulls are mostly hollow to hold soft tissues that cannot be preserved. Fine sediments compress the skull to flatten it the way you might step on an empty tin can. These skulls may be preserved, but some of the three-dimensional structure is lost. The sand-sized sediments in the Carnegie Quarry are fine enough to preserve bone in great detail but coarse enough to resist compression of the skulls.
This specimen of Allosaurus fragilis has attracted the attention of paleontologists around the world and has been referenced in many scientific studies. You don't, however, have to be a scientist to marvel at this beautiful specimen. The real skull is on display at the Quarry Exhibit Hall.
Jurassic Fact: Almost 75% of all theropods (meat-eating dinosaurs) found in the Morrison Formation are Allosaurus!
For more information: Visit the Carnegie Museum of Natural History in Pittsburgh, Pennsylvania where another Allosaurus fragilis from Dinosaur National Monument is on display.
Did You Know?
Whitewater rafting is a popular way to experience the remote canyon areas at Dinosaur National Monument. You can take a licensed commercial rafting trip or you can tackle the river on your own, provided you have a permit, the correct equipment and the necessary experience.