Some 250 million years ago, the earth suffered the greatest biological crisis in its history. Around 95 percent of all living species died out--a global catastrophe far greater than the dinosaurs' demise 185 million years later. How this happened remains a mystery. But there are many competing theories Some blame huge volcanic eruptions that cover


Format Häftad Omfång 320 sidor Språk Engelska Förlag Princeton University Press Utgivningsdatum 2015-03-22 ISBN 9780691165653