R. A. Fortey, A. W. A. Rushton, 2000. "Welsh Borderland", 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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Successions to either side of the Linley–Pontesford fault display important differences. East of this structure (Columns 35–37) the Caradoc strata rest unconformable on Precambrian to Tremadoc formations, while westerly successions (Columns 33–34) display early to mid-Ordovician strata. Taken together, the Ordovician rocks on the margins of Wales are not only classical, but afford the best-preserved faunas, and thick pre-Ashgill strata. The Geological Survey has published Memoirs covering much of the area (Pocock et al. 1938; Greig et al. 1968; Cave & Hains in press). Following Whittard’s (1955–67) monograph on the trilobites, the Shelve area graptolite succession has been described by Strachan (1986) and Hughes (1989), and the brachiopods by Williams (1974). Whittard’s map was published by W. T. Dean (Whittard 1979) and the stratigraphical terminology used in the column follows subsequent revision by Lynas et al. (1991).
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.