Dinosaur Fossils. Dinosaur Fossils. In the past century, one of the most amazing findings by scientists has been dinosaur bones. Dinosaur bones-also called fossils are the remains of old dinosaur skeletons. Sometimes scientists who discover dinosaur fossils just find footprints in the dirt. Other times, they find enough fossils to make a complete dinosaur. But how do dinosaur bones that are millions of years old get turned into fossils? How can something buried beneath dirt and sand last for so long? Fossil Formation.