It's a colorful survey of life before the mass extinction event, based on extensive studies and the use of ever-improving technology. Halliday is careful to note that the contents of his book are “grounded in fact, either directly observable from the fossil record, strongly inferred, or, where our knowledge is incomplete, plausible based on what we can say for sure.” Otherlands is comprised of 16 chapters, each centered on a specific locale (Africa, Alaska, Chile, Antarctica, and elsewhere) and geologic era (Pleistocene, Cenozoic, Mesozoic, etc.).

Something I learned on that journey, and which will become clear through the book, is that one’s personal search for meaning cannot be isolated from all that is going on in the world around us. In the pages that follow, as we trace the intimate connections that link our lives to those in our community, to all of humanity, and to the entire living Earth, we’ll discover how inextricably we are all interrelated—and explore some of the profound implications arising from that relatedness.