Class-book of GeologyMacmillan and Company, 1890 - 516 σελίδες |
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Σελίδα xvi
... lava with a few of the cells filled up with infiltrated mineral matter ( Amygdules ) 36. Section of a lava - current 37. Elongation of cells in direction of flow of a lava - stream . PAGE 67 71 73 74 77 82 84 85 86 87 97 888888 98 99 38 ...
... lava with a few of the cells filled up with infiltrated mineral matter ( Amygdules ) 36. Section of a lava - current 37. Elongation of cells in direction of flow of a lava - stream . PAGE 67 71 73 74 77 82 84 85 86 87 97 888888 98 99 38 ...
Σελίδα xvii
... lava , in a paste of finer volcanic debris . 74. Conglomerate 75. Concretionary forms assumed by Dolomite , Magnesian Limestone , Durham 76. Weathered surface of crinoidal limestone 77. Group of crystals of felspar , quartz , and mica ...
... lava , in a paste of finer volcanic debris . 74. Conglomerate 75. Concretionary forms assumed by Dolomite , Magnesian Limestone , Durham 76. Weathered surface of crinoidal limestone 77. Group of crystals of felspar , quartz , and mica ...
Σελίδα 95
... lava are discharged , till they gradually pile up the volcanic cone round the vent whence they escape . A volcanic cone , so long as it remains , bears eloquent testimony to the nature of the causes that produced it . Even many ...
... lava are discharged , till they gradually pile up the volcanic cone round the vent whence they escape . A volcanic cone , so long as it remains , bears eloquent testimony to the nature of the causes that produced it . Even many ...
Σελίδα 96
... lava - streams that descend from them will be cut into ravines and isolated into separate masses by the streams that have even already deeply trenched them . Where all the ordinary and familiar signs of a volcano have been removed , how ...
... lava - streams that descend from them will be cut into ravines and isolated into separate masses by the streams that have even already deeply trenched them . Where all the ordinary and familiar signs of a volcano have been removed , how ...
Σελίδα 97
... Lava , and 2d , Frag- mentary materials . ( 1 ) Lava . of volcanoes . Under this name are comprised all the molten rocks These rocks present many varieties in composition FIG . 35. - Cellular Lava with a few of the cells filled up with ...
... Lava , and 2d , Frag- mentary materials . ( 1 ) Lava . of volcanoes . Under this name are comprised all the molten rocks These rocks present many varieties in composition FIG . 35. - Cellular Lava with a few of the cells filled up with ...
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Άλλες εκδόσεις - Προβολή όλων
Συχνά εμφανιζόμενοι όροι και φράσεις
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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