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The Nod Glas décollement of the Welsh Basin

  • W. T. Pratt (a1)

Abstract

Structural, petrographic and metamorphic evidence is presented for localized end-Caledonian (Acadian) décollement within a ‘black shale’ formation in the central Welsh Basin, close to the Caradoc–Ashgill boundary. Similar detachments are probably widespread in other parts of the, paratectonic Caledonides with upright folds and cleavage, particularly in sequences with strong viscosity contrasts.

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Allen, P. M. & Jackson, A. A. 1985. Geology of the country around Harlech. Memoir of the British Geological Survey, Sheet 135 with part of Sheet 149 (England and Wales).
Cave, R. 1965. The Nod Glas sediments of Caradoc age in North Wales. Geological Journal 4, 279–98.
Cave, R. & Haines, B. A. 1986. Geology of the country between Aberystwyth and Machynlleth. Memoir of the British Geological Survey, Sheet 163 (England and Wales).
Cave, R. & Price, D. 1978. The Ashgill Series near Welshpool, North Wales. Geological Magazine 115, 183–94.
Hossack, J. R. 1979. Use of balanced cross-sections in calculation of orogenic contractions. Journal of the Geological Society of London 136, 705–11.
Jones, O. T. & Pugh, W. J. 1935. The geology of the district around Machynlleth and Aberystwyth. Proceedings of the Geologists' Association 46, 247300.
Martin, B. A., Howells, M. F. & Reedman, A. J. 1981. A geological reconnaissance study of the Dyfi Valley region, Gwynedd/Powys, Wales. Environmental Protection Unit (Report ENPU 81–1), Institute of Geological Sciences.
Merriman, R. J. & Roberts, B. 1989. Caledonian strain-related low temperature metatnorphism in the Corris Slate Belt, Central Wales, U.K. Terra Abstracts 1, 310.
Price, D. & Magor, P. 1984. The ecological significance of variation in the genetic composition of Rawtheyan (late Ordovician) trilobite faunas from North Wales, U.K. Geological Journal 19, 187201.
Pugh, W. J. 1923. The geology of the district around Corris and Aberllefenni (Merionethshire). Quarterly Journal of the Geological Society of London 79, 508–45.
Wilson, G. 1967. The geometry of cylindrical and conical folds. Proceedings of the Geologists' Association 78, 179210.
Woodcock, N. H. 1984. Early Palaeozoic sedimentation and tectonics in Wales. Proceedings of the Geologists' Association 95, 323–35.

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