Class-book of GeologyMacmillan and Company, 1890 - 516 páginas |
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Página xvii
... Clay - ironstone concretion enclosing portion of a fern 62. Gypsum 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 ...
... Clay - ironstone concretion enclosing portion of a fern 62. Gypsum 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 ...
Página 16
... clay in which a few harder kernels are still left . Into this soft layer roots may descend from the surface , and ... Clays will produce clayey soil , sandstones , sandy soil , or , where these two 16 CHAP . GEOLOGICAL WORK OF THE AIR.
... clay in which a few harder kernels are still left . Into this soft layer roots may descend from the surface , and ... Clays will produce clayey soil , sandstones , sandy soil , or , where these two 16 CHAP . GEOLOGICAL WORK OF THE AIR.
Página 17
... clay or loam . Hence , knowing what the underlying rock is , we may usually infer what must be the character of the overlying soil , or , from the nature of the soil , we may form an opinion respecting the quality of the rock that lies ...
... clay or loam . Hence , knowing what the underlying rock is , we may usually infer what must be the character of the overlying soil , or , from the nature of the soil , we may form an opinion respecting the quality of the rock that lies ...
Página 46
... clay among them , especially away from the margin of the lake . They are , no doubt , further distinguished by the greater abundance of the remains of plants and animals preserved in them . But lakes likewise serve as receptacles for a ...
... clay among them , especially away from the margin of the lake . They are , no doubt , further distinguished by the greater abundance of the remains of plants and animals preserved in them . But lakes likewise serve as receptacles for a ...
Página 50
... clays , which , by arresting the water in its descent , throw it out along the base of the slopes . After much wet weather , the upper surface of these clays becomes , as it were , lubricated by the accumulation of water , and large ...
... clays , which , by arresting the water in its descent , throw it out along the base of the slopes . After much wet weather , the upper surface of these clays becomes , as it were , lubricated by the accumulation of water , and large ...
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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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