The Arctic was not always cold and inhospitable. Millions of years ago dinosaurs roamed under tree ferns in a warmer world. This book is a survey of the dinosaurs found in the rocks of this now frigid landscape. The author has spent decades exploring fossil bearing sediments of the Mesozoic and has written a lively and readable account of this ancient world. But the book is more than dinosaurs. It is also a geological overview of Alaska; a report on the fossils that have been found; descriptions of footprints of long dead animals; and a review of the fossil plants and the paleoclimate and paleoecology of the Arctic.