The Isle of Wedmore relay ramp: how fault evolution created King Alfred's historic landmark |
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| Institution: | 1. British Geological Survey, Maclean Building, Wallingford OX10 8BB, UK;2. University of Göttingen, Goldschmidtstraße 3, 37077 Göttingen, Germany;1. School of the Environment, Geography and Geosciences, Burnaby Building, University of Portsmouth, PO1 3QL, United Kingdom;2. CGG, Llandudno, North Wales LL30 1SA, United Kingdom;1. University of Coimbra, MARE – Marine and Environmental Sciences Centre/ARNET - Aquatic Research Network, Department of Earth Sciences, Rua Sílvio Lima, University of Coimbra - Pólo II, 3030-790 Coimbra, Portugal;2. Department of Geography, Durham University, Durham DH1 3LE, UK;3. Polytechnic Institute of Tomar, Quinta do Contador, Estrada da Serra, 2300-313 Tomar, Portugal;4. Portuguese Center for Geohistory and Prehistory, Geosciences Center, University of Coimbra, Portugal;5. ICT – Institute of Earth Sciences, Department of Geosciences, University of Évora, Rua Romão Ramalho, 59, 7000-671 Évora, Portugal;6. 13 Churchgate, Cheshunt, Waltham Cross, Hertfordshire EN8 9NB, UK;7. Department of Archaeology, Durham University, Durham DH1 3LE, UK;1. Museo de Paleontología, CIGEA, Facultad de Ciencias Exactas, Físicas y Naturales, Universidad Nacional de Córdoba, Av. Vélez Sarsfield 299, X5000JJC Córdoba, Argentina;2. Facultad de Ciencias Naturales, Universidad Nacional de Salta, Salta, Argentina;3. School of Earth and Ocean Sciences, University of Victoria, BC, Canada;1. Nant-y-felin, Pentraeth, Anglesey LL75 8YA, United Kingdom of Great Britain and Northern Ireland;2. Department of Natural Sciences, Amgueddfa Cymru-National Museum Wales, Cathays Park, Cardiff CF10 3NP, United Kingdom of Great Britain and Northern Ireland |
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| Abstract: | The Isle of Wedmore covers an area of ~ 19 km2, rises up to ~ 65 m above the surrounding lowlands of the Somerset Levels, and was an island until the Middle Ages. The topography is interpreted as having been formed by a relay ramp between two right-stepping faults (the Weare Fault to the west and the Mudgley Fault to the east) which have tens of metres of downthrow to the south, and which are probably normal faults. The relay ramp has a dip of about 3° to the SW and is breached by the NW-striking Wedmore Fault, which has up to ~ 23 m downthrow to the NE. Several NE-trending faults occur in the relay ramp, which are interpreted as having formed when the relay ramp became a contractional step when the Weare and Mudgley faults underwent sinistral reactivation, or as N–S contraction occurred during the Cenozoic. Analogues for this behaviour are presented from the Liassic rocks on the coast between Lilstock and East Quantoxhead. |
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