Earth Sculpture; Or, The Origin of Land-forms |
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Page 55
... plateau of accumulation . A glance at the geological history of the district will show how far the plateau - character is original , and to what extent and by what means it has been subsequently modified . Reference has been made to the ...
... plateau of accumulation . A glance at the geological history of the district will show how far the plateau - character is original , and to what extent and by what means it has been subsequently modified . Reference has been made to the ...
Page 56
... plateau- country for a prolonged period , during which sediments were washed down as before from the neighbouring uplands , and gathered over the level surface of the Cretaceous marine strata until they had reached a thickness of 5000 ...
... plateau- country for a prolonged period , during which sediments were washed down as before from the neighbouring uplands , and gathered over the level surface of the Cretaceous marine strata until they had reached a thickness of 5000 ...
Page 58
... plateau - country horizontal Carboniferous strata occupy the surface . DIAGRAMMATIC SECTION ACROSS COLORADO PLATEAU . C , Carboniferous strata ; T , younger strata ; a ... b , level formerly attained by plateau ; tt , remnants of the ...
... plateau - country horizontal Carboniferous strata occupy the surface . DIAGRAMMATIC SECTION ACROSS COLORADO PLATEAU . C , Carboniferous strata ; T , younger strata ; a ... b , level formerly attained by plateau ; tt , remnants of the ...
Page 59
... plateau . All the rock that formerly existed between a - b and the surface of the Carboniferous strata ( C ) has been denuded away . How has this enormous erosion been effected , and what are the more prominent features of the denuded ...
... plateau . All the rock that formerly existed between a - b and the surface of the Carboniferous strata ( C ) has been denuded away . How has this enormous erosion been effected , and what are the more prominent features of the denuded ...
Page 65
... plateau of horizontal strata we recognise the following stages :-( 1 ) The excava- tion of deep trenches by streams and rivers ; ( 2 ) the gradual sapping and undermining of cliffs , etc. , the widening of valleys , and the consequent ...
... plateau of horizontal strata we recognise the following stages :-( 1 ) The excava- tion of deep trenches by streams and rivers ; ( 2 ) the gradual sapping and undermining of cliffs , etc. , the widening of valleys , and the consequent ...
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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