Class-book of GeologyMacmillan, 1896 - 404 páginas |
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Página xviii
... ( Lower and Upper Silurian ) 254 126. Silurian Phyllopod Crustacean 255 127. Silurian Brachiopods 255 128. Silurian Lamellibranch 256 129. Silurian Gasteropod . 256 130. Silurian Cephalopods 257 131. Plants of the Devonian period 259 132 ...
... ( Lower and Upper Silurian ) 254 126. Silurian Phyllopod Crustacean 255 127. Silurian Brachiopods 255 128. Silurian Lamellibranch 256 129. Silurian Gasteropod . 256 130. Silurian Cephalopods 257 131. Plants of the Devonian period 259 132 ...
Página 17
... lower ground or to some runnel 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 ...
... lower ground or to some runnel 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 ...
Página 19
... lower levels ( Fig . 10 ) . The sections laid bare in these gullies show that the rubbish is arranged in more or less distinct layers which lie generally parallel with the surface of the slope ; in other words , it is rudely stratified ...
... lower levels ( Fig . 10 ) . The sections laid bare in these gullies show that the rubbish is arranged in more or less distinct layers which lie generally parallel with the surface of the slope ; in other words , it is rudely stratified ...
Página 20
... lower portions may be of great antiquity . In the south - east of England , for instance , the brick - earths contain the bones of animals that have long since passed away . Dust . By the action of wind , above referred to , a vast ...
... lower portions may be of great antiquity . In the south - east of England , for instance , the brick - earths contain the bones of animals that have long since passed away . Dust . By the action of wind , above referred to , a vast ...
Página 25
... lower animals . It is a matter of some interest to know that this substance , so indispensable for the Durness , Sutherlandshire . formation of the shells of so large a number of sea - creatures , is constantly supplied to the sea by ...
... lower animals . It is a matter of some interest to know that this substance , so indispensable for the Durness , Sutherlandshire . formation of the shells of so large a number of sea - creatures , is constantly supplied to the sea by ...
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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