Class-book of GeologyMacmillan and Company, 1890 - 516 páginas |
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Página 13
... mass that rings like stone under our feet ; but , as soon as a thaw sets in , the ice that formed the binding cement passes into water which converts the soil into soft earth or mud . This process , repeated winter after winter , breaks ...
... mass that rings like stone under our feet ; but , as soon as a thaw sets in , the ice that formed the binding cement passes into water which converts the soil into soft earth or mud . This process , repeated winter after winter , breaks ...
Página 19
... mass of bare rock rises up as a steep bank or cliff , it is liable to constant degradation , and the materials detached from its surface accumulate down the slopes , forming what is known as a Talus ( Fig . 4 ) . In mountainous or hilly ...
... mass of bare rock rises up as a steep bank or cliff , it is liable to constant degradation , and the materials detached from its surface accumulate down the slopes , forming what is known as a Talus ( Fig . 4 ) . In mountainous or hilly ...
Página 35
... masses hundreds of feet thick and many miles in diameter . The valleys in a range of mountains afford many striking examples of these alluvial cones or fans , as they are called . Where the tributary torrents are numerous , a succession ...
... masses hundreds of feet thick and many miles in diameter . The valleys in a range of mountains afford many striking examples of these alluvial cones or fans , as they are called . Where the tributary torrents are numerous , a succession ...
Página 46
... lake and been there gradually covered up in the growing mass of marl . Many FIG . 17. - Piece of shell - marl containing shells of Limnæa peregra . examples of these marl - deposits are to be found. 46 CHAP . RECORDS OF LAKES.
... lake and been there gradually covered up in the growing mass of marl . Many FIG . 17. - Piece of shell - marl containing shells of Limnæa peregra . examples of these marl - deposits are to be found. 46 CHAP . RECORDS OF LAKES.
Página 49
... of that porous layer . The overlying mass of rock is thus made to 1 Physical Geography Class - Book , p . 222 . E rest upon a watery and weakened platform , and if CHAPTER V HOW SPRINGS LEAVE THEIR MARK IN GEOLOGICAL HIS-
... of that porous layer . The overlying mass of rock is thus made to 1 Physical Geography Class - Book , p . 222 . E rest upon a watery and weakened platform , and if CHAPTER V HOW SPRINGS LEAVE THEIR MARK IN GEOLOGICAL HIS-
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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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