A. W. A. Rushton, 2000. "NW Scotland: Hebridean Terrane", 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 Hebridean Terrane is a fragment of the Laurentian craton made up mainly of Lewisian Gneiss and Torridonian sedimentary rocks of later Proterozoic age. These rocks were peneplaned and formed a broad but shallow marine shelf upon which a succession of Cambrian-Ordovician rocks was deposited. Durness Group carbonates of Cambrian to Ordovician age overlie conformably Lower Cambrian arenaceous rocks; the outcrop extends for nearly 200 km, from Eriboll in the north to Skye in the south. The Durness Group is most completely preserved in a half-graben at Durness.
Peach et al. (1907) described the Geological Survey’s detailed mapping of the north-west highlands (see Oldroyd 1990), the basis for all subsequent work. Correlation of the upper parts of the group is dependent on faunal evidence. The stratigraphical succession adopted here is shown in Columns 86-89, the principal divisions of the Durness Group being treated as formations, following Cowie et al. (1972). The faunas are exclusively of Laurentian type and, having nothing in common with coeval faunas in England and Wales, gave some of the first-described and best evidence for the former existence of the Iapetus ocean.
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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.