Abstract
THE greatest riddle in Scottish geology at the present day is that of the true stratigraphical position of the series of metamorphic rocks in the central, southern, and eastern Highlands which Sir Archibald Geikie has included under the term “Dalradian”. These rocks have been mapped and to a large extent described by officers of the Geological Survey, and have been much discussed by others, but no agreement has been reached as to the structure of the area or the relations of various members of the series to each other. Even the question as to which is the top and which the bottom of the succession of deposits is still unsettled. One great difficulty met with is the lack of organic remains in the altered sediments. But fossils have recently been discovered in the group of rocks which Prof. J. W. Gregory conveniently terms the “Boundary Fault Series”. This series has been traced as an interrupted belt along the southern border of the Highlands from Stone-haven on the east to the island of Arran on the west, and it is prolonged into Ireland. The best exposures in Scotland occur in Arran, in the district between Loch Lomond and Callander, and in Forfarshire and Kincardineshire. They consist of cherts or jaspers and shales, sometimes associated with limestones and with some peculiar igneous rocks.
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JEHU, T. Discovery of Fossils in the Chert and Black Shale Series at Aberfoyle. Nature 89, 347 (1912). https://doi.org/10.1038/089347a0
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DOI: https://doi.org/10.1038/089347a0
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