Class-book of GeologyMacmillan and Company, 1886 - 516 páginas |
Dentro del libro
Página xiv
... Volcanic block ejected during the deposition of strata in water 137 39. Volcanoes on lines of fissure 139 40. Outline of a volcanic neck 142 41. Ground - plan of the structure of the Neck shown in Fig . 40 142 42. Section through the ...
... Volcanic block ejected during the deposition of strata in water 137 39. Volcanoes on lines of fissure 139 40. Outline of a volcanic neck 142 41. Ground - plan of the structure of the Neck shown in Fig . 40 142 42. Section through the ...
Página xv
... volcanic breccia , a rock composed of angular fragments of lava , in a paste of finer volcanic debris 197 74. Conglomerate 198 75. Concretionary forms assumed by Dolomite , Magnesian Lime- stone , Durham 206 76. Weathered surface of ...
... volcanic breccia , a rock composed of angular fragments of lava , in a paste of finer volcanic debris 197 74. Conglomerate 198 75. Concretionary forms assumed by Dolomite , Magnesian Lime- stone , Durham 206 76. Weathered surface of ...
Página xvi
Archibald Geikie. FIG . PAGE 111. Section of a volcanic neck 274 112. Section of a mineral vein 276 113. Common Cockle ( Cardium edule ) 285 114. Fragment of crumpled Schist 309 115. A , Fucoid - like impression ( Eophyton Linneanum ) ...
Archibald Geikie. FIG . PAGE 111. Section of a volcanic neck 274 112. Section of a mineral vein 276 113. Common Cockle ( Cardium edule ) 285 114. Fragment of crumpled Schist 309 115. A , Fucoid - like impression ( Eophyton Linneanum ) ...
Página 42
... volcanic eruption , can turn it out of that If its original pathway has been a winding one , it goes on digging out its bed which , with all its bends , gradu- ally sinks below the level of the surrounding country . The deep and ...
... volcanic eruption , can turn it out of that If its original pathway has been a winding one , it goes on digging out its bed which , with all its bends , gradu- ally sinks below the level of the surrounding country . The deep and ...
Página 80
... volcanic regions , hot springs ( geysers ) rise to the surface which , besides other mineral ingredients , contain a considerable proportion of silica ( p . 157 ) . This substance is de- posited as Siliceous Sinter round the vents ...
... volcanic regions , hot springs ( geysers ) rise to the surface which , besides other mineral ingredients , contain a considerable proportion of silica ( p . 157 ) . This substance is de- posited as Siliceous Sinter round the vents ...
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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 gypsum iron Jurassic kinds known lakes land lava layers limestone living lower marine marls masses materials Mesozoic miles mineral matter Miocene molten mountains natural North occur Old Red Sandstone organic remains original Palæozoic period Permian plants and animals Pliocene present preserved probably quartz rain records regions rivers salt sand schists sea-floor Section 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 vent volcanic