N. H. Woodcock, 2000. "Terranes in the British and Irish Ordovician", A revised correlation of Ordovician Rocks in the British Isles, R. A. Fortey, D. A. T. Harpe, J. K. Ingham, A. W Owen, M. A. Parkes, A. W. A. Rushton, N. H. Woodcock
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The tectonic controls on Ordovician geology have become much better known since publication of the first edition of this correlation chart (Williams et al. 1972).Of particular relevance to this new edition is the recognition that some fault-bounded regions of Britain and Ireland have geological histories that contrast with adjacent areas. Such regions have come to be known as terranes (e.g. Dewey 1982; Williams & Hatcher 1982). A contrast in the history of adjacent terranes may indicate some degree of former geographical separation, later reduced by terrane amalgamation along the bounding faults.
The terranes of interest here are those with an internal continuity of their Ordovician facies, faunas and structures, but which are separated by large faults or shear zones from adjacent terranes having different Ordovician geology. Both the number of Ordovician terranes represented in the British Isles and the magnitude of their relative displacements are subjects of continuing debate. In this changeable research climate, it has been one aim of this new correlation chart to provide at least one stratigraphical column from each terrane or important sub-terrane. This section outlines the terrane analyses that have guided this choice of columns. Detailed intra-and inter-terrane relationships are discussed in appropriate sections of this report.
Figures & Tables
This Report is revised and expanded from the 1972 publication providing an up-to-the-minute account of the British Ordovician formations and their correlation nationally and internationally. It also includes the most comprehensive treatment of Ireland ever attempted. The reference list of a comprehensive bibliography of papers on the subject published since 1970.
The British sections are the type for the Ordovician System and classical in stratigraphical, tectonic and volcanic studies. The Charts bring together 30 years of research over the period in which plate tectonics has revolutionized our understanding of the Lower Palaeozoic rocks of the British Isles.
This Special Report will be a valuable reference for research and applied geoscientists working with rocks of Ordovician age. It will be of particular interest to those working in, or visiting, the Welsh mountains and the English Lake District.