PrefaceIntroductory section with history of research and philosophy of the guideThe basement and Neoproterozoic rocks of North Mayo and the Ox MountainsThe metamorphic fold nappes and syn-orogenic intrusions of ConnemaraThe subduction-accretion complex and dismembered ophiolite of Clew BayThe Ordovician fore-arc and arc complex and the Silurian back-arc basin of South MayoThe post-orogenic Devonian and Carboniferous depositsThe Devonian Granite batholiths, their emplacement and mineralisationFinal section summarising admissible tectonic interpretations and areas of debateBibliography