Class-book of GeologyMacmillan and Company, 1890 - 516 páginas |
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Página 11
... decayed , corroded . So distinctive is this appearance that it is always looked for in an ancient piece of stone - work ; and if not seen , its absence at once suggests a doubt whether the masonry can really be old . No matter of what 1 ...
... decayed , corroded . So distinctive is this appearance that it is always looked for in an ancient piece of stone - work ; and if not seen , its absence at once suggests a doubt whether the masonry can really be old . No matter of what 1 ...
Página 12
... decay in a similar way . Indeed , an examination of any crumbling building will show that , in proportion as the chiselled surface disappears , the stone puts on the ordinary look which it wears where it has never been cut by man , and ...
... decay in a similar way . Indeed , an examination of any crumbling building will show that , in proportion as the chiselled surface disappears , the stone puts on the ordinary look which it wears where it has never been cut by man , and ...
Página 13
... decay from this cause . The cliffs into which it sometimes rises show at their base long trails of rubbish entirely derived from its waste . ( 3 ) Frost . - A third and familiar source of decay in stone exposed to the atmosphere is to ...
... decay from this cause . The cliffs into which it sometimes rises show at their base long trails of rubbish entirely derived from its waste . ( 3 ) Frost . - A third and familiar source of decay in stone exposed to the atmosphere is to ...
Página 14
... decay may be sought in the re- markable power possessed by Rain of chemically corroding stones . In falling through ... decay is no doubt retarded ; but in the absence of vegetation , the outer crust of the decayed layer is apt to ...
... decay may be sought in the re- markable power possessed by Rain of chemically corroding stones . In falling through ... decay is no doubt retarded ; but in the absence of vegetation , the outer crust of the decayed layer is apt to ...
Página 15
... decay of the surface of the land . Fig . 2 , for instance , is a drawing of one of these sections , in which a gradual passage may be traced from solid sandstone ( a ) under- neath up into broken - up sandstone ( b ) , b and thence into ...
... decay of the surface of the land . Fig . 2 , for instance , is a drawing of one of these sections , in which a gradual passage may be traced from solid sandstone ( a ) under- neath up into broken - up sandstone ( b ) , b and thence into ...
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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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