Time for a fossil hunt! Digging through a layer of sedimentary rock, scientists uncover many relics of prehistoric Earth. Tiny trilobites prove that a vast desert was once an ocean. Huge dinosaur fossils show where dinosaurs once roamed! With this title, readers will learn about the types of fossils, how they form, and why scientists study them today. This title includes engaging special features such as a fossil profile, a fossil comparison chart,...