This collective volume presents the current knowledge about the Mesozoic reptiles of Patagonia. This is the first book to ever to examine the Mesozoic era in the English language, and the first in any language to treat it in an entire decade. The contributors cover a great amount of material, describing the phylogenetic relationships among the reptiles, their diversity, evolution, and paleobiology. The Patagonian region had a distinctive fauna, which has become much better known over the last 40 years, sometimes due to amazing discoveries. With copious illustrations, this book provides more than a glimpse of a fascinating, ancient past.