Class-book of GeologyMacmillan and Company, 1886 - 516 páginas |
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Página xiv
... fissure · 137 139 40. Outline of a volcanic neck 41. Ground - plan of the structure of the Neck shown in Fig . 40 42. Section through the same Neck as in Figs . 40 and 41 43. Volcanic dykes rising through the bedded tuff of a crater 44 ...
... fissure · 137 139 40. Outline of a volcanic neck 41. Ground - plan of the structure of the Neck shown in Fig . 40 42. Section through the same Neck as in Figs . 40 and 41 43. Volcanic dykes rising through the bedded tuff of a crater 44 ...
Página 68
... fissures . Nearly half a century has passed away since this landslip occurred . The cliff remains much as it was at first , and the sunken fields with their bits of hedgerow still slope steeply down to the bottom of the declivity . But ...
... fissures . Nearly half a century has passed away since this landslip occurred . The cliff remains much as it was at first , and the sunken fields with their bits of hedgerow still slope steeply down to the bottom of the declivity . But ...
Página 138
... Fissures . - The various materials ejected from a volcano to the surface may conceivably be in course of time ... fissure , up which these materials rose , and out of which they were ejected . This opening in the solid crust of the ...
... Fissures . - The various materials ejected from a volcano to the surface may conceivably be in course of time ... fissure , up which these materials rose , and out of which they were ejected . This opening in the solid crust of the ...
Página 139
... an active volcano is a hideous yawning chasm , with rough red and black walls , at the bottom of which lie steaming pools of molten lava . Every now and then , a sharp explosion tears the lava open , Ix . ] 139 VOLCANOES AND FISSURES .
... an active volcano is a hideous yawning chasm , with rough red and black walls , at the bottom of which lie steaming pools of molten lava . Every now and then , a sharp explosion tears the lava open , Ix . ] 139 VOLCANOES AND FISSURES .
Página 144
... fissures , which are formed in large numbers in and around a volcanic cone , but may also arise at a distance from any actual volcano . During the convulsions of a volcano , the cone and the surrounding country are split by lines of fissure ...
... fissures , which are formed in large numbers in and around a volcanic cone , but may also arise at a distance from any actual volcano . During the convulsions of a volcano , the cone and the surrounding country are split by lines of fissure ...
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Términos y frases comunes
abundant accumulated acid augite basin beds bones bottom Brachiopods calcareous calcite carbonate of lime Carboniferous chapter characteristic chiefly clay containing corals Cretaceous crinoids crystalline crystals cycads decay deposits detritus Devonian earth earth's crust Eocene Europe evidence example extinct fauna feet thick fishes fissures fossils genera geological history geologist glacier globe gradually granite gravel ground iron Jurassic kinds known lakes land lava layers limestone living lower marine marked marls masses materials Mesozoic miles mineral matter Miocene molten mountains natural North occur Old Red Sandstone organic remains original Paleozoic period Permian plants and animals Pliocene present preserved probably quartz rain records regions rivers salt 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 tion trace Triassic upper valley various vegetation veins vent volcanic