Secrets in stone--fossils! What child isn't fascinated by these clues to what life was like on Earth before people became the dominant creatures on the planet? From the earliest fossils of 570 million years ago to the coal forests that followed 200 million years later; from the early reptiles and amphibians to the pterosaurs who dominated the skies--drawings and artifacts tell the story of this early history. But it is the dinosaurs--Tyrannosaurus, Oviraptor, Brachiosaurus, or the horned Triceratops--that most young readers will find the most appealing. They are all here, with information about what they ate, how they traveled, and what happened when they disappeared. A glossary and index make this the perfect first reference for budding historians.