human
What is the name of the dinosaur that is the most famous fossil found at the Dinosaur National Monument?
assistant
The most famous fossil found there is the Apatosaurus. It was discovered in 1877 by a man named Othniel Charles Marsh. It is the most complete dinosaur skeleton ever found. It was the first dinosaur to be discovered and described by a paleontologist. It was named after the Greek god Apatosaurus.