The stratigraphy of the Permo-Triassic rocks of the Dorset and East Devon Coast World Heritage Site,U.K. |
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| Authors: | Ramues Gallois |
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| Institution: | 92 Stoke Valley Rd., Exeter EX4 5ER, UK |
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| Abstract: | An almost complete late Permian and Triassic succession c. 1300 m thick is exposed in the cliffs between Exmouth and Lyme Regis in the Dorset and East Devon Coast World Heritage Site, U.K. All except the youngest part of the succession was deposited in terrestrial environments that include alluvial fans, aeolian sand dunes, braided rivers and playa-lakes. The succession of environments with time not only reflects the denudation of the Variscan mountains that lay to the west and south in the Cornubian and Armorican massifs, but also responses to periods of tectonic uplift and subsidence, and to long- and short-term climatic and associated biotic changes. Notwithstanding the almost continuous, readily accessible exposures in the cliffs and intertidal areas, few of the formations have yielded any age-diagnostic fossils with the result that much of the succession cannot be dated with certainty. The Permo-Triassic boundary has been placed in the lower part of the succession on the basis of magnetostratigraphy and the same method has been used to quantify some of the stage boundaries and the principal tectonic breaks in the succession. |
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| Keywords: | Permian Triassic Devon Dorset World Heritage Site Stratigraphy Sedimentology |
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