The Wealden Group of the Wessex Basin exposed in the coastal cliffs of the Isle of Wight, southern England, is famous for the abundance, diversity and high quality of preservation of its dinosaur fauna. This comprehensive guide reviews all of the major groups of dinosaurs recorded from the island and describes all of the known species. Notes are provided on the status of each species and guides to identifiation are given. Some data are published here for the first time. Each species is illustrated with examples from internationally famous museum collections.