Class-book of GeologyMacmillan, 1896 - 404 páginas |
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Resultados 6-10 de 49
Página 29
... original hollow is enlarged into a wide deep caldron , at the bottom of which the stones can only be stirred by the heaviest floods . Cavities of this kind , known as pot - holes , are of frequent occurrence in rocky watercourses as ...
... original hollow is enlarged into a wide deep caldron , at the bottom of which the stones can only be stirred by the heaviest floods . Cavities of this kind , known as pot - holes , are of frequent occurrence in rocky watercourses as ...
Página 31
... original pathway has been a winding one , it goes on digging out its bed which , with all its bends , gradually sinks below the level of the surrounding country . The deep and picturesque gorge in which the Moselle winds from Trèves to ...
... original pathway has been a winding one , it goes on digging out its bed which , with all its bends , gradually sinks below the level of the surrounding country . The deep and picturesque gorge in which the Moselle winds from Trèves to ...
Página 36
... original sharp edges , and to pass from the state of rough angular detritus into that of thoroughly water - worn gravel . Further , they will be found not to lie entirely at random , as might at first sight be imagined . A little ...
... original sharp edges , and to pass from the state of rough angular detritus into that of thoroughly water - worn gravel . Further , they will be found not to lie entirely at random , as might at first sight be imagined . A little ...
Página 50
... original fissures has been softened by the rich tapestry of verdure which the genial climate of that southern coast fosters in every sheltered nook . But the scars have not been healed , and they will no doubt remain still visible for ...
... original fissures has been softened by the rich tapestry of verdure which the genial climate of that southern coast fosters in every sheltered nook . But the scars have not been healed , and they will no doubt remain still visible for ...
Página 55
... original rim or ring is gradually lengthened into a tube which may eventually be filled up inside , and may be thickened irregularly outside by the trickle of calcareous water ( Fig . 20 ) . But. ing successive layers of growth in a ...
... original rim or ring is gradually lengthened into a tube which may eventually be filled up inside , and may be thickened irregularly outside by the trickle of calcareous water ( Fig . 20 ) . But. ing successive layers of growth in a ...
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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