The North Yorkshire coastline is home to some of the world's best Jurassic geology and is most famous for its marine origin fossils, especially the ammonites of the Upper Lias (Toarcian). An abundance of these fossils, together with a spectacular rugged landscape, attracts many visitors hoping to find a piece of prehistoric history, and who undoubtedly will leave with a love of this coast. Indeed, its popularity has only increased in recent years and with around 100 species of Upper Lias ammonite to be found on this stretch of coast, this book provides a source of reference for their identification. It also gives further context around them, from their anatomy and evolution, to their stratigraphic relationship. This book therefore provides something for everyone who has an interest in this subject - from the occasional visitor and the seasoned collector, to those studying this field in greater detail.