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Guide to the Geological Model of the Assynt Mountains (Classic Reprint)

Guide to the Geological Model of the Assynt Mountains (Classic Reprint)

34784819
1062.5 руб.
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Описание
Excerpt from Guide to the Geological Model of the Assynt Mountains

The region illustrated by this Model can scarcely be rivalled for the variety and interest of its tectonics, or for the clearness with which they are displayed. The history of the prolonged investigations by which the true sequence of geological formations and the effects of the tectonic movements were determined has been told in the Memoir on "The Geological Structure of the North-West Highlands." From that volume we learn of the first advances in establishing the stratigraphy made by Macculloch in the early part of the last century, and of the efforts made by Murchison and other observers to explain what appeared to be a sequence upwards from Lewisian Gneiss through fossiliferous deposits into the Eastern Schists. That such a sequence existed seemed indubitable on the evidence presented by one mountain-side after another, but that it represented a true succession of geological formations, superimposed in order of age, was keenly opposed by Nicol, and at a later date by Lapworth, Callaway, Bonney, and others. It was not, however, till the ground had been mapped in detail on the six-inch scale by the Geological Survey that it could be demonstrated that the supposed succession was everywhere deceptive, and due to the piling-up of the rocks by over-thrusting on a stupendous scale, an explanation which has since been found applicable in mountainous regions all the world over. In this survey Drs. Peach and Horne, the authors of this Guide, took a foremost part.

The North-West Highlands serve, as a type-area for the study of earth-movements and mountain-building, and as such have attracted much attention from British and Foreign geologists. They are, however, difficult of access. The Model and this descriptive Guide have been designed to help those who cannot visit the ground itself, to form a conception of the physical features and of the grand tectonic structures with which they are related.

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