EUROPE/Caledonides of Britain and Ireland 57 Figure Simplified Caledonian tectonic map of the British Isles with their Appalachian continuation shown in the inset Bl, Ballantrae Ophiolite; BO, Borrowdale Volcanics; CB, Central Belts; CBC, Clew Bay Complex; GGF, Great Glen Fault; GR, Grangegeeth Terrane; HBC, Highland Border Complex; HBF, Highland Boundary Fault; LL, Leadhills Line; M, Moine; Ma, Manx Group; MSF, Menai Straits Fault; MSG, Monian Supergroup; MT, Moine Thrust; MVT, Midland Valley Terrane; OBF, Orlock Bridge Fault; RIL, Red Indian Line; SC, South Connemara Terrane; SCG, South Connemara Group; Sk, Skiddaw Group; SL, Slane Fault; SMT, South Mayo Trough; SUF, Southern Uplands Fault; TL, Tornquist Line; Ty, Tyrone Ophiolite; WFZ, Wicklow Fault Zone