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Rocks and Their Origins

Chapter 2: LIST OF ILLUSTRATIONS
By Grenville A. J. Cole
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About This Book

An accessible introduction to petrology that explains how rocks are classified, described, and traced to their origins using field observation, microscopy, and experiment. It surveys common rock-forming minerals and treats limestones, sandstones, clays and shales, igneous rocks, and metamorphic rocks in turn, showing how rock properties influence landscape and record depositional and tectonic processes. Emphasis is placed on reading outcrops, weathering and sediment transport, and on the laboratory and theoretical methods used to infer rock histories, with practical examples and photographs to guide non-specialist readers toward further study.

LIST OF ILLUSTRATIONS

Fig. PAGE
1 Surface of Limestone plateau, Causse du Larzac, Aveyron 45
2 Ravine in Limestone, Cañon of the Dourbie, Aveyron 47
3 Waterworn cliff of Limestone, Millersdale 49
4 Limestone country dissected by ravines, Hercegovina 51
5 Sand developing from Sandstone, Cape of Good Hope 59
6 Siliceous Conglomerate, Co. Waterford 75
7 Quartzite Cone, Croagh Patrick 77
8 Shrinkage-cracks in Clay, Spitsbergen 81
9 Landslide of Limestone over Shale, Drôme 93
10 Weathering of Shale, Isère 95
11 Boulder-clay, Crich, Derbyshire (Phot. H. A. Bemrose) 97
12 Nordenskiöld Glacier, Spitsbergen 99
13 Sefström Glacier, Spitsbergen 101
14 Ash-layer of 1906 on Vesuvius 111
15 Puy de la Vache, Puy-de-Dôme 113
16 Granite invading Mica-schist, Cape Town 121
17 Weathering granite, Lundy Island 139
18 Granite weathering under tropical conditions, Matopo Hills 141
19 Composite Gneiss, Co. Donegal 153
20 Composite Gneiss, Ängnö, Sweden 155

(Figs. 11 and 17 are reproduced from the Cambridge County Geographies of Derbyshire and Devonshire respectively; the rest of the illustrations are from photographs by the author.)