Class-book of GeologyMacmillan, 1896 - 404 páginas |
Dentro del libro
Resultados 6-10 de 82
Página 20
... sometimes even more than 250 feet high , with deep troughs and irregular circular hollows between them , and they occasionally form a strip several miles broad , bordering the sea . The particles of sand are driven inland by the wind ...
... sometimes even more than 250 feet high , with deep troughs and irregular circular hollows between them , and they occasionally form a strip several miles broad , bordering the sea . The particles of sand are driven inland by the wind ...
Página 21
... sometimes in vast quantities , into the sea . Every brook , made muddy by heavy rain , is an example of this transport , for the mud that discolours the water is simply the finer material of the soil washed off by rain . When we reflect ...
... sometimes in vast quantities , into the sea . Every brook , made muddy by heavy rain , is an example of this transport , for the mud that discolours the water is simply the finer material of the soil washed off by rain . When we reflect ...
Página 24
... sometimes cut into dark tunnels and passages ( Fig . 7 ) . Even where the solvent action of the water of rivers is otherwise inappreciable , it can be detected by means of chemical analysis . Thus rivers , partly by 24 CHAP . RECORDS OF ...
... sometimes cut into dark tunnels and passages ( Fig . 7 ) . Even where the solvent action of the water of rivers is otherwise inappreciable , it can be detected by means of chemical analysis . Thus rivers , partly by 24 CHAP . RECORDS OF ...
Página 34
... sometimes far beyond the limits of the ordinary or modern channels , these deposits , even when worn into fragmentary patches , retain their clear record of the operations of the river . Let us in imagination follow the course of a ...
... sometimes far beyond the limits of the ordinary or modern channels , these deposits , even when worn into fragmentary patches , retain their clear record of the operations of the river . Let us in imagination follow the course of a ...
Página 38
... sometimes to a height of several hundred feet , and occasion- ally to the number of 6 or 8 or even more ( Fig . 13 ) . Here and there , by the narrowing of the intervening strip of plain , two terraces merge into one , and at some ...
... sometimes to a height of several hundred feet , and occasion- ally to the number of 6 or 8 or even more ( Fig . 13 ) . Here and there , by the narrowing of the intervening strip of plain , two terraces merge into one , and at some ...
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Términos y frases comunes
abundant abundantly accumulated acid Ammonites basin beds bones bottom Brachiopods calcareous calcite Cambrian carbonate of lime Carboniferous Chapter characteristic chiefly clay containing corals Cretaceous crinoids crystalline crystals decay deposits detritus Devonian earth earth's crust Eocene eruptive rocks Europe evidence example extinct fauna feet thick fishes fissures formations fossils genera geological history geologist glacier globe gneiss gradually granite gravel ground iron Jurassic kinds known lakes land lava layers limestone living lower marine marls mass materials Mesozoic miles Miocene molten mountains natural North occur Old Red Sandstone organic remains original Palæozoic period Permian plants and animals Pliocene present preserved probably quartz rain regions represented rivers sand schists sea-floor sediment sedimentary rocks shales sheets shells siliceous Silurian slopes soil solid sometimes species stone strata stratified stream structure substance surface terrestrial Tertiary trace Triassic Trilobites upper valley various vegetation vent volcanic