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Welsh Borderland Fault System : ウィキペディア英語版 | Welsh Borderland Fault System The Welsh Borderland Fault System is a zone of faulting and associated folding which runs northeastwards through Wales from Pembrokeshire through Carmarthenshire and Powys into Shropshire in England. It comprises the Tywi Lineament, Pontesford Lineament and Church Stretton Fault Zone.〔Brenchley, P.J. & Rawson, P.F. (eds) 2006 ''The Geology of England and Wales.'' The Geological Society, London (p80)〕 The southern margin of the fault system is defined by the Church Stretton Fault and Dulas Valley Fault, amongst others whilst its northern margin is defined by the Garth-Llanwrtyd Fault Belt in Carmarthenshire. The Church Stretton Fault component of the system is deemed to form the terrane boundary between the Cymru Terrane to its northwest and the Wrekin Terrane to its southeast.〔Brenchley, P.J. & Rawson, P.F. (eds) 2006 ''The Geology of England and Wales.'' The Geological Society, London (pp14-15)〕 The system was active during the Caledonian Orogeny and was reactivated during the later Variscan Orogeny. 〔Geology of the Llandovery District - a brief explanation of the geological maps sheet 212 ‘Llandovery’〕 ==References==
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