The leading textbook in its field, this work applies paleobiological principles to the fossil record while detailing the evolutionary history of major plant and animal phyla. It incorporates current research from biology, ecology, and population genetics. Written for biology and geology undergrads, the text bridges the gap between purely theoretical paleobiology and solely descriptive invertebrate paleobiology books, emphasizing the cataloguing of live organisms over dead objects. This third edition revises art and research throughout, expands the coverage of invertebrates, includes a discussion of new methodologies, and adds a chapter on the origin and early evolution of life.