Class-book of GeologyMacmillan and Company, 1890 - 516 σελίδες |
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Σελίδα xvii
... marked surface 83. Cast of a sun - cracked surface preserved in the next succeeding layer of sediment . 84. Rain - prints on fine mud 85. Vertical trees ( Sigillaria ) in sandstone , Swansea ( Logan ) 86. Hills formed out of horizontal ...
... marked surface 83. Cast of a sun - cracked surface preserved in the next succeeding layer of sediment . 84. Rain - prints on fine mud 85. Vertical trees ( Sigillaria ) in sandstone , Swansea ( Logan ) 86. Hills formed out of horizontal ...
Σελίδα 12
... marked upon natural faces of rock . The gradual disappearance of the artificial smoothness given by the mason , and its replacement by the ordinary natural rough surface of the stone , shows that this natural surface must also be the ...
... marked upon natural faces of rock . The gradual disappearance of the artificial smoothness given by the mason , and its replacement by the ordinary natural rough surface of the stone , shows that this natural surface must also be the ...
Σελίδα 13
... marked , the same kind of waste takes place in a less striking manner . ( 2 ) Saturation and Desiccation . — Another cause of the decay of the exposed surfaces of rocks is to be sought in the alter- nate soaking of them with rain and ...
... marked , the same kind of waste takes place in a less striking manner . ( 2 ) Saturation and Desiccation . — Another cause of the decay of the exposed surfaces of rocks is to be sought in the alter- nate soaking of them with rain and ...
Σελίδα 40
... marked , as we have seen , by an arrangement in layers , beds , or strata lying one upon another . This stratified disposition indeed is characteristic of all sedimentary accumulations , and is best developed where currents have been ...
... marked , as we have seen , by an arrangement in layers , beds , or strata lying one upon another . This stratified disposition indeed is characteristic of all sedimentary accumulations , and is best developed where currents have been ...
Σελίδα 44
... marked shelf or terrace . In natural lakes , the same process is going on , though hardly recognisable , because concealed under the water . But if by any means a lake could be rapidly emptied , its former level would be marked by a ...
... marked shelf or terrace . In natural lakes , the same process is going on , though hardly recognisable , because concealed under the water . But if by any means a lake could be rapidly emptied , its former level would be marked by a ...
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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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