Ancient Sea Reptiles is a thorough, albeit difficult, book for readers with novice paleontology interest. Nash provides direct explanations, diagrams, photographs and artist renderings to introduce and inform readers on a variety of marine reptiles from prehistory. As stated above, I had a difficult time reading this book. It is straightforward to a fault, and assumes that the reader has basic understanding of biology and fossils, which I do not. However, I do not consider this a flaw of the author. The book managed to hold my interest even through passages I struggled to understand, and I look forward to returning to it once I have a firmer understanding of its subject.