Fossilized Skin on Dinosaur ‘Mummies’ Isn’t Skin at All Wyoming’s “dinosaur mummies,” once thought to preserve fossilized flesh, are actually detailed clay molds formed by microbes as the creatures decayed By Andrea Tamayo edited by Sarah Lewin Frasier Mummy of the juvenile duck-billed dinosaur Edmontosaurus annectens preserved as a dried carcass resting on its ribcage…