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Geological Society, London, Special Publications; 1979; v. 8; p. 221-228;
DOI: 10.1144/GSL.SP.1979.008.01.22
© 1979 Geological Society of London

3. Tectonics

The Tarfside succession and the structure and stratigraphy of the eastern Scottish Dalradian rocks

Ben Harte

Grant Institute of Geology, University of Edinburgh, West Mains Road, Edinburgh

Limestones and quartzites within the Tarfside culmination of Glen Esk (Angus) are correlated with the upper part of the Dalradian Argyll Group, and form part of a right way up succession extending upwards into the Southern Highland Group. This correlation makes the Tarfside limestones stratigraphically equivalent to the Loch Tay and Deeside limestones in the inverted flat belt of the Tay nappe. The zone of inversion between the Tarfside succession and that of Deeside and Loch Tay lies in the headwaters of Glen Esk and further south; the Tarfside succession occupies the structural position of the right way up limb of the Pitlochry-Kirkmichael recumbent syncline beneath the Tay nappe. The actual inversion is thought to take place across a slide which also causes the sudden disappearance of the Green Beds. Evidence for sedimentary facies variation in the Tarfside rocks and their stratigraphical equivalents supports the interpretation of some of Read’s Boyne Line phenomena (in Aberdeenshire and Banffshire) as being sedimentary facies variations.