_Of the Geological Survey of Great Britain; Hon. Fellow of King’s College, London._ GENERAL CONSIDERATIONS 1 CONSIDERATION OF FOSSILS 4 CHEMICAL AND NEBULAR HYPOTHESES OF THE GLOBE 15 MODIFICATIONS OF THE EARTH’S SURFACE 26 ERUPTIVE ROCKS 30 PLUTONIC ERUPTIONS 31 Granite 31 Syenite 34 Protogine 35 Porphyry 37 Serpentine 38 VOLCANIC ROCKS 39 Trachytic Formations 39 Basaltic Formations 44 Volcanic or Lava Formations 51 METAMORPHIC ROCKS 71 General Metamorphism 74 THE BEGINNING 80 PRIMARY EPOCH 99 CAMBRIAN PERIOD 101 SILURIAN PERIOD 102 Lower Silurian Period 104 Upper Silurian Period 110 OLD RED SANDSTONE AND DEVONIAN PERIOD 119 CARBONIFEROUS PERIOD 130 Carboniferous Limestone 140 Coal Measure…
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