Memoirs of the Geological Survey, Scotland

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Excerpt from Memoirs of the Geological Survey, Scotland: The Geology of Cowal, Including the Part of Argyllshire Between the Clyde and Loch FineThe district described in the present memoir includes that part of Argyllshire, generally known as Cowal, which lies between Loch Fyne and the Firth of Clyde. It embraces the south-western extension of the various bands of metamorphic rocks which form the southern edge of the Highlands. Bounded on three sides by coast-lines and penetrated by a number of sea-lochs it affords better and more continuous sections of these rocks than are generally to be met with in the interior of the country. Advantage has been taken of these exceptional features to describe the rocks in much greater detail than would otherwise be desirable.From the detailed study of this part of the Highlands much information has been obtained by the Geological Survey regarding the structures of the schists and the successive movements by which these structures have been produced. Originally most of the rocks described in the following chapters formed a thick series of sedimentary deposits, the geological age of which still remains to be determined. These strata have been found to have undergone a remarkable series of repeated movements. After being thrown into folds and having been cleaved so as to acquire a first system of deformation, they have again suffered a repetition of the process more than once. They consequently present secondary and tertiary perhaps even quaternary structures, probably due to mechanical movement with accompanying re-crystallisation. The regional metamorphism thus produced is not uniformly distributed, hut seems to increase in intensity both from the south-east and north-west towards a nearly central line, ranging about north-east and south-west, which is an anticline of the foliation. It has not been traced to any intrusion of igneous rock, and is so general and diffused that it can hardly be regarded as in any sense a contact phenomenon. Where intrusive masses occur in the district they have given rise to their own accompanying alteration, quite apart from the general metamorphism of the whole area. These interesting and complicated structures, so well displayed in Cowal, are fully discussed in the present Memoir.About the PublisherForgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.comThis book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully, any imperfections that remain are intentionally left to preserve the state of such historical works.