Earth Sculpture; Or, The Origin of Land-forms |
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Page 20
... basalt , consist partly of glass and partly of crystalline in- gredients , and vary in texture from compact to coarse- grained ; yet others are built up wholly of crystalline substances , and may be fine - grained or very coarsely ...
... basalt , consist partly of glass and partly of crystalline in- gredients , and vary in texture from compact to coarse- grained ; yet others are built up wholly of crystalline substances , and may be fine - grained or very coarsely ...
Page 21
... basalt , the jointing is often very regular , giving rise to a prismatic columnar structure , as in the basalts of Staffa and the Giant's Causeway . The main fact , however , with which we are at present concerned is simply this : that ...
... basalt , the jointing is often very regular , giving rise to a prismatic columnar structure , as in the basalts of Staffa and the Giant's Causeway . The main fact , however , with which we are at present concerned is simply this : that ...
Page 25
... . Such insoluble materials are frequently stained yellow - brown or red , owing to the pressure of iron- oxides . In this way felspathic rocks gradually crum- ble down . Thus , granite , gneiss , basalt AGENTS OF DENUDATION 25.
... . Such insoluble materials are frequently stained yellow - brown or red , owing to the pressure of iron- oxides . In this way felspathic rocks gradually crum- ble down . Thus , granite , gneiss , basalt AGENTS OF DENUDATION 25.
Page 26
James Geikie. ble down . Thus , granite , gneiss , basalt , and other rocks largely composed of felspar , usually show a weathered crust , which , according to the nature of the rock and the length of time its surface has been exposed ...
James Geikie. ble down . Thus , granite , gneiss , basalt , and other rocks largely composed of felspar , usually show a weathered crust , which , according to the nature of the rock and the length of time its surface has been exposed ...
Page 52
... and clay . Horizontal strata of such rocks as sandstone , shale , limestone , basalt , etc. , enter largely into the composition of certain lofty plateaux and mountain- regions . And they belong , moreover , to very 52 EARTH SCULPTURE.
... and clay . Horizontal strata of such rocks as sandstone , shale , limestone , basalt , etc. , enter largely into the composition of certain lofty plateaux and mountain- regions . And they belong , moreover , to very 52 EARTH SCULPTURE.
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Common terms and phrases
accumulation Alps anticlines basalt base-level basins become beds Carboniferous character cliffs coast-lines cones configuration Cretaceous crust crustal movements crystalline débris denudation deposits depressions depth detritus direction dislocations drainage elevation epigene action epigene agents eroded escarpments eventually feet fiords flexures flow fluvio-glacial deposits folds fracture gently geological structure glacial action glaciers gradually granite ground-moraines Highlands hills hollows horizontal strata ice-sheet igneous rocks inclined indented infrequently irregular islands joints Jura Mountains laccoliths lakes land land-forms land-surface lava less limestone low grounds masses materials Mesozoic modified moraines mountain-chain mountain-valleys mountains normal faults North Old Red Sandstone outcrops owe their origin Permian plain of erosion plateau regions relatively result ridges rock-basins rock-masses sand sandstones schistose schists Section sediment shales Silurian slopes Southern Uplands strata streams and rivers superficial surface surface-features synclinal tectonic tend thickness tion tracts traversed underground undulating usually valleys vertical volcanic