The Cambrian Explosion: The Construction of Animal Biodiversity by Douglas Erwin and James Valentine. Roberts and Company Publishers. (2013).
 ISBN-13: ‎978-1936221035. 7 1/4" x 10 1/4" x, 406 pages Hardcover with no dustjacket. Other than the bumping on the top of front and back covers, I am hard-pressed to find fault with the condition of this book. Covers are clean with no scratches. No previous owner markings. No tears, folds or creases to pages. Binding is tight with no looseness to pages. Not ex-library, not remaindered and not a facsimile reprint. For sale by Jon Wobber, bookseller since 1978. LC08a

"The Cambrian Period records one of the most extraordinary transitions in the history of life. Beginning as simple sponges more than 635 million years ago, the earliest animals evolved into a diverse marine fauna over the course of 100 million years. In The Cambrian Explosion, Erwin and Valentine synthesize research from many fields to explain why there was such remarkable novelty of animal forms. This is an integrative work of the highest quality, covering one of the most fascinating and transformative periods in life’s history." - Amazon review