A young dinosaur "mummy" with fossil restorer Tyler Keeler. A "mummy" of a young specimen of the broad-beaked dinosaur Edmontosaurus anctens, with fossil restorer Tyler Keeler of the University of Chicago. The young dinosaur "mummy," nicknamed "Ed Jr.," was buried in floods about 66 million years ago, preserving a fossilized skeleton and, in a thin layer of clay, areas of scaly, wrinkled skin and a high, fleshy ridge along its back. Credit: Courtesy Fossil Lab, University of Chicago