A. W. A. Rushton, J. K. Ingham, 2000. "Scotland: the Highland Border Complex and Grampian 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 Highland Border Complex refers to a variety of rock-types exposed in a scattering of much-faulted outcrops lying along the Highland Boundary Fault that extends northeastwards from the Island of Arran to Stonehaven (Fig. 3). No unified stratigraphical scheme can be applied across the outcrops, and many units have not been formally named. Curry et al. (1984) reviewed the evidence for the ages of the various outcrops, and gave references to earlier work. The present chart is based on their compilation, and summarizes some of the sections, especially those at which some stratigraphical control is available. In several instances, elements of the Complex are seen to be unconformably overlain by the Lower Old Red Sandstone, which forms the steep northern limb of the Strathmore Syncline of the northern part of the Midland Valley of Scotland. The problem of the age of the Dalradian Supergroup has been much discussed. Although the lower divisions are of Proterozoic age and recent work affirms the continuity of the Ben Ledi and Keltie Water Grit formations with the Leny Limestone of late Early Cambrian age (Harris et al. 1998; Tanner 1998), Molyneux (1998) has re-opened the possibility that a part of the uppermost Dalradian succession, including the Macduf Slates is, at the oldest, of early Ordovician age.
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.