Cleaven Dyke was for some centuries identified as a Roman construction. However, the authors' surveys and excavations strongly suggest that it was built as part of the Neolithic cursus monument tradition. The volume presents the comprehensive results of their study, showing in detail the segmented nature of the Dyke's construction, its alignment and the palaeoenvironmental evidence for the surrounding landscape. In addition the nearby recitlinear timber enclosure of Littleour is also described.