Class-book of GeologyMacmillan and Company, 1890 - 516 páginas |
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Página 4
... beds of rivers , the margins of lakes , or the shores of the sea . Wherever smoothed rolled pebbles occur , they ... bed of the sea at the present day , enable us to infer that where they lie the sea once rolled . Pits , quarries ...
... beds of rivers , the margins of lakes , or the shores of the sea . Wherever smoothed rolled pebbles occur , they ... bed of the sea at the present day , enable us to infer that where they lie the sea once rolled . Pits , quarries ...
Página 29
... beds along which the material is driven . The most solid rocks are worn down ; deep long gorges are dug out , and ... bed , that a river excavates its channel , is most strikingly shown immediately below a lake . In traversing a ...
... beds along which the material is driven . The most solid rocks are worn down ; deep long gorges are dug out , and ... bed , that a river excavates its channel , is most strikingly shown immediately below a lake . In traversing a ...
Página 31
... bed of harder material is underlain by one more easily removable . Where a stream , after flowing over the upper bed , encounters the decomposable bed below , it eats away the latter more rapidly . The overlying hard rock is thus under ...
... bed of harder material is underlain by one more easily removable . Where a stream , after flowing over the upper bed , encounters the decomposable bed below , it eats away the latter more rapidly . The overlying hard rock is thus under ...
Página 34
... beds of active torrents . Alluvium . But more universal testimony to the work of running water is to be found in the deposits which it has accumu- lated . To these deposits the general name of alluvium has been given . Spreading out on ...
... beds of active torrents . Alluvium . But more universal testimony to the work of running water is to be found in the deposits which it has accumu- lated . To these deposits the general name of alluvium has been given . Spreading out on ...
Página 39
... bed and of transporting the coarser detritus resting there . Large quantities of shingle may thus be swept out of the ordinary channel and be strewn across the nearer parts of the flood - plain . As the current spreads over this plain ...
... bed and of transporting the coarser detritus resting there . Large quantities of shingle may thus be swept out of the ordinary channel and be strewn across the nearer parts of the flood - plain . As the current spreads over this plain ...
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Términos y frases comunes
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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