Earth Sculpture; Or, The Origin of Land-forms |
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Page viii
... Relatively weak and strong Structures - Stages in the Erosion of a Mountain - chain- Forms assumed under Denudation - Ultimate face of Mountain - chains . CHAPTER VI LAND - FORMS IN REGIONS OF HIGHLY FOLDED AND DIS- TURBED STRATA ...
... Relatively weak and strong Structures - Stages in the Erosion of a Mountain - chain- Forms assumed under Denudation - Ultimate face of Mountain - chains . CHAPTER VI LAND - FORMS IN REGIONS OF HIGHLY FOLDED AND DIS- TURBED STRATA ...
Page 6
... relatively recent age , while those occupying such broad tracts as Brazil , the Canadian uplands , etc. , are of vast antiquity . Crys- talline schistose rocks , with associated granites and other igneous rocks , seem everywhere to ...
... relatively recent age , while those occupying such broad tracts as Brazil , the Canadian uplands , etc. , are of vast antiquity . Crys- talline schistose rocks , with associated granites and other igneous rocks , seem everywhere to ...
Page 19
... minerals , known under the name of felspar . The group includes nearly all the igneous and most of the metamorphic rocks . The derivative rocks that come under the same head are of relatively small importance AGENTS OF DENUDATION 19.
... minerals , known under the name of felspar . The group includes nearly all the igneous and most of the metamorphic rocks . The derivative rocks that come under the same head are of relatively small importance AGENTS OF DENUDATION 19.
Page 20
James Geikie. come under the same head are of relatively small importance . The minerals entering most abundantly into the composition of the felspathic rocks are the felspars ( aluminous silicates of potash , soda , and lime ) , various ...
James Geikie. come under the same head are of relatively small importance . The minerals entering most abundantly into the composition of the felspathic rocks are the felspars ( aluminous silicates of potash , soda , and lime ) , various ...
Page 23
... relatively little import- ance . Amongst them are rock - salt , gypsum , coal and lignite , ironstones , and other ores . All these , doubtless , are very notable and valuable , but they are neither so abundant nor so widely distributed ...
... relatively little import- ance . Amongst them are rock - salt , gypsum , coal and lignite , ironstones , and other ores . All these , doubtless , are very notable and valuable , but they are neither so abundant nor so widely distributed ...
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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