Class-book of GeologyMacmillan and Company, 1890 - 516 σελίδες |
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Σελίδα xviii
... Upper Silurian sea - weed ( Chondrites versimilis ) , natural size 121. Graptolites from Silurian rocks . 249 250 122. Silurian Corals • 251 123. Silurian Echinoderms 252 124. Filled - up Burrows or Trails left by a sea - worm on the ...
... Upper Silurian sea - weed ( Chondrites versimilis ) , natural size 121. Graptolites from Silurian rocks . 249 250 122. Silurian Corals • 251 123. Silurian Echinoderms 252 124. Filled - up Burrows or Trails left by a sea - worm on the ...
Σελίδα 3
... upper layer is that which contains the foundations and rubbish of modern London . Next comes that which encloses the relics of the Roman occupation . At the bottom lies the layer that preserves the scanty traces of the early flint ...
... upper layer is that which contains the foundations and rubbish of modern London . Next comes that which encloses the relics of the Roman occupation . At the bottom lies the layer that preserves the scanty traces of the early flint ...
Σελίδα 4
... upper layer of oyster - shells would prove that the ground was then submerged beneath the sea . The present condition of the ground shows that subsequently the sea retired and the locality passed into dry land as it is to - day . It is ...
... upper layer of oyster - shells would prove that the ground was then submerged beneath the sea . The present condition of the ground shows that subsequently the sea retired and the locality passed into dry land as it is to - day . It is ...
Σελίδα 17
... or brook that sweeps them away seaward . Both on gentle and on steep slopes , this transporting power of rain is continually removing the upper layer of bared soil . C Where soil is exposed to the sun , it is II 17 SOIL SUBSOIL - RAIN.
... or brook that sweeps them away seaward . Both on gentle and on steep slopes , this transporting power of rain is continually removing the upper layer of bared soil . C Where soil is exposed to the sun , it is II 17 SOIL SUBSOIL - RAIN.
Σελίδα 18
... upper parts of the soil are removed . Even where a grassy turf protects the general surface , bare places may always be found whence this covering has been removed . Rabbits , moles , and other animals throw out soil from their burrows ...
... upper parts of the soil are removed . Even where a grassy turf protects the general surface , bare places may always be found whence this covering has been removed . Rabbits , moles , and other animals throw out soil from their burrows ...
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Άλλες εκδόσεις - Προβολή όλων
Συχνά εμφανιζόμενοι όροι και φράσεις
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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