Class-book of GeologyMacmillan and Company, 1890 - 516 σελίδες |
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Σελίδα 4
... occur , they point to the influence of moving water ; so that we conclude , even though the site is now dry land , that the sand and gravel underneath it prove it to have been formerly under water . Again , below the soil in other ...
... occur , they point to the influence of moving water ; so that we conclude , even though the site is now dry land , that the sand and gravel underneath it prove it to have been formerly under water . Again , below the soil in other ...
Σελίδα 17
... occur together , they may give rise to sandy 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 ...
... occur together , they may give rise to sandy 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 ...
Σελίδα 20
... occur , during which there may be a considerable drifting of the finer particles of soil by the wind . We probably hardly realise how much the soil may be removed here and heightened there from this cause . Sand - dunes . Some of the ...
... occur , during which there may be a considerable drifting of the finer particles of soil by the wind . We probably hardly realise how much the soil may be removed here and heightened there from this cause . Sand - dunes . Some of the ...
Σελίδα 41
... occur at the foot of torrent slopes , along the lower and more level ground , especially on the inner or concave side of the loops , over the flood - plains , and finally in the deltas formed where rivers enter lakes or the sea . In ...
... occur at the foot of torrent slopes , along the lower and more level ground , especially on the inner or concave side of the loops , over the flood - plains , and finally in the deltas formed where rivers enter lakes or the sea . In ...
Σελίδα 48
... occur , showing that the basin was at first fresh . The valley - bottoms around saline lakes are now crusted with gypsum , salt , or other efflorescence , and their waters are almost wholly devoid of life . Such conditions as these help ...
... occur , showing that the basin was at first fresh . The valley - bottoms around saline lakes are now crusted with gypsum , salt , or other efflorescence , and their waters are almost wholly devoid of life . Such conditions as these help ...
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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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