Class-book of GeologyMacmillan and Company, 1890 - 516 páginas |
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Página xvi
... crystals ( Rock - crystal ) 106 • 107 109 118 45. Calcite ( Iceland spar ) , showing its characteristic rhombohedral cleavage 124 46. Cube , octahedron , dodecahedron 125 47. Tetragonal prism and pyramid 125 48. Orthorhombic prism 125 ...
... crystals ( Rock - crystal ) 106 • 107 109 118 45. Calcite ( Iceland spar ) , showing its characteristic rhombohedral cleavage 124 46. Cube , octahedron , dodecahedron 125 47. Tetragonal prism and pyramid 125 48. Orthorhombic prism 125 ...
Página xvii
... crystals PAGE 135 63. Group of fluor - spar crystals 64. Concretions 65. Section of a septarian nodule , with coprolite of a fish as a nucleus . 66. Piece of oolite 67. Piece of pisolite . 136 137 138 140 141 142 142 143 144 · 145 145 ...
... crystals PAGE 135 63. Group of fluor - spar crystals 64. Concretions 65. Section of a septarian nodule , with coprolite of a fish as a nucleus . 66. Piece of oolite 67. Piece of pisolite . 136 137 138 140 141 142 142 143 144 · 145 145 ...
Página 15
... crystal- line rock that may be quarried out in large solid blocks ( a in Fig . 3 ) , yet when traced upward to within a few feet from the surface it may be seen to have been split by innumerable rents into fragments which are never ...
... crystal- line rock that may be quarried out in large solid blocks ( a in Fig . 3 ) , yet when traced upward to within a few feet from the surface it may be seen to have been split by innumerable rents into fragments which are never ...
Página 97
... crystals of two or more minerals inter- locked and felted together into a coherent mass . Some are chiefly composed of a dark brown or black glass , while others consist of a compact stony substance with abundant crystals imbedded in it ...
... crystals of two or more minerals inter- locked and felted together into a coherent mass . Some are chiefly composed of a dark brown or black glass , while others consist of a compact stony substance with abundant crystals imbedded in it ...
Página 101
... crystals that constitute the lava from the explosion of which the dust was derived ( p . 143 ) . From the wide area over which the fragmentary materials ejected by volcanoes are dispersed in the atmosphere before they fall to the earth ...
... crystals that constitute the lava from the explosion of which the dust was derived ( p . 143 ) . From the wide area over which the fragmentary materials ejected by volcanoes are dispersed in the atmosphere before they fall to the earth ...
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Términos y frases comunes
abundant accumulated acid Ammonites ancient Assistant Master beds BOOK bottom Brachiopods calcareous calcite Cambrian Cambridge carbonate of lime Carboniferous Chapter chiefly clay College containing corals Cretaceous crinoids crystalline crystals decay deposits detritus Devonian earth earth's crust Edited ELEMENTARY Eocene eruptive Europe evidence example extinct fauna Fcap feet fissures fossils genera GEOGRAPHY geological history glacier globe gradually granite gravel GREEK ground Illustrated Jurassic kinds known lakes land lava layers limestone living lower marine marls mass materials Mesozoic mineral Miocene mountains natural occur Old Red Sandstone organic remains original Palæozoic Paleozoic period Permian plants and animals Pliocene present preserved Prof Professor quartz Red Sandstone regions revised rivers rocks sand schists sediment sedimentary sedimentary rocks shales sheets shells siliceous Silurian soil solid sometimes species stone strata structure substance surface terrestrial Tertiary thick trace Triassic upper various vegetation volcanic
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