Titlebook: Introduction to Geology; H. H. Read,Janet Watson Textbook 1975Latest edition Macmillan Publishers Limited 1975 earth science.geology

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The Hercynides and Uralides with their Forelands,he Lower Palaeozoic era. Those parts of the network which remained active through Upper Palaeozoic times display a complex structure resulting from the superposition of later patterns on Caledonian or older foundations. These long-lived belts include the Hercynides of western and central Europe, the

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The Alpine-Himalayan Belt and the Eurasian Craton,ty extending through the entire Phanerozoic eon. A glance at Fig. 7.1 shows that the belt began its evolution as a portion of the peripheral mobile system encircling the supercontinents. It was transformed to a largely intra-continental structure by the collision of northward-moving fragments of Gon

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Gondwanaland: Disruption of a Supercontinent, mass bordered by still active mobile belts (Fig. 8.1). To the west and south, marginal belts extending from the western margin of South America through west Antarctica to eastern Australasia formed part of what was to become the . (Chapters 10, 11). To the north and east, the belts of the . orogeni

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The Pacific Ocean and its Island Arcs, into the Precambrian. It differs, too, from the new oceans in its structural relationships. Mobile belts — orogenic mountain-tracts or systems of island arcs and trenches — border the ocean at almost every point and its internal structural pattern is by no means everywhere concordant with the conti

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The Cordilleran and Andean Mobile Belts and the North American Crato,g the eastern Pacific arrests the eye by its simplicity (Fig. 11.1). From Alaska to Mexico and from the Caribbean to Cape Horn two broad mountain-belts 8000–10000 km in length rise abruptly above the narrow continental shelf to separate the ocean from the large cratons of North and South America. Th

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