Class-book of GeologyMacmillan and Company, 1886 - 516 páginas |
Dentro del libro
Página xiii
... detritus at their base 47 11. Flat stones in a bank of river - shingle , showing the direction of the current that transported and left them 49 12. Section of alluvium showing direction of currents 50 13. River - terraces 51 14 ...
... detritus at their base 47 11. Flat stones in a bank of river - shingle , showing the direction of the current that transported and left them 49 12. Section of alluvium showing direction of currents 50 13. River - terraces 51 14 ...
Página 32
... detritus towards the ocean . An acquaintance with each of these kinds of work is needful to enable us to understand the nature of the records which river - action leaves behind it . Chemical Action of Running Water . We have seen that ...
... detritus towards the ocean . An acquaintance with each of these kinds of work is needful to enable us to understand the nature of the records which river - action leaves behind it . Chemical Action of Running Water . We have seen that ...
Página 36
... detritus which they sweep along their channels , rivers always con- tain more or less mineral matter suspended in their water or travelling with the current on the bottom . The amount of material thus transported varies greatly in ...
... detritus which they sweep along their channels , rivers always con- tain more or less mineral matter suspended in their water or travelling with the current on the bottom . The amount of material thus transported varies greatly in ...
Página 37
... world , the general average proportion of sediment floating in the water of rivers is I part in every 1500 of water , we can readily understand how seriously in the course of time must the 111. ] 37 TRANSPORT OF DETRITUS .
... world , the general average proportion of sediment floating in the water of rivers is I part in every 1500 of water , we can readily understand how seriously in the course of time must the 111. ] 37 TRANSPORT OF DETRITUS .
Página 40
Archibald Geikie. That it is by means of the gravel and other detritus pushed along the bottom by the current , rather than by the mere friction of the water on its bed , that a river excavates its channel , is most strikingly shown ...
Archibald Geikie. That it is by means of the gravel and other detritus pushed along the bottom by the current , rather than by the mere friction of the water on its bed , that a river excavates its channel , is most strikingly shown ...
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Términos y frases comunes
abundant accumulated acid augite basin beds bones bottom Brachiopods calcareous calcite carbonate of lime Carboniferous chapter characteristic chiefly clay containing corals Cretaceous crinoids crystalline crystals cycads decay deposits detritus Devonian earth earth's crust Eocene Europe evidence example extinct fauna feet thick fishes fissures fossils genera geological history geologist glacier globe gradually granite gravel ground gypsum iron Jurassic kinds known lakes land lava layers limestone living lower marine marls masses materials Mesozoic miles mineral matter Miocene molten mountains natural North occur Old Red Sandstone organic remains original Palæozoic period Permian plants and animals Pliocene present preserved probably quartz rain records regions rivers salt sand schists sea-floor Section sediment sedimentary rocks shales sheets shells siliceous Silurian slopes soil solid sometimes species stone strata stratified stream structure substance surface terrestrial Tertiary tion trace Triassic upper valley various vegetation vent volcanic