Since the 1960s, the general theory of plate tectonics has provided a clear link between the geological processes of seafloor spreading, subduction and mountain building. But details are still unclear and the nature of the theory may depend upon the recent interpretation of "suspect terranes", areas of apparently unrelated geology comprising single orogenic belts. This books introduces the reader to the concept of suspect terranes, how they relate to classic plate tectonics theory and what they represent in terms of tectonic processes. The book is amed at research and academic structural geologist, and student in the earth sciences.