Earth Sculpture; Or, The Origin of Land-forms |
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Page 87
... base - level , b b , in the two synclinal troughs . ( s1 s2 ) , which remain unaffected by it . In the third trough ( s ) , however , it remains above the base - level , protecting the underlying softer beds , and thus forming a hill ...
... base - level , b b , in the two synclinal troughs . ( s1 s2 ) , which remain unaffected by it . In the third trough ( s ) , however , it remains above the base - level , protecting the underlying softer beds , and thus forming a hill ...
Page 88
... base - level . action of springs . In the latter , however , the strata hang away from the axis , and water percolating through them , and coming out along the bedding- But this is a mat- planes , tends to their demolition . ter which ...
... base - level . action of springs . In the latter , however , the strata hang away from the axis , and water percolating through them , and coming out along the bedding- But this is a mat- planes , tends to their demolition . ter which ...
Page 123
... base - level . Should that base - level be steadfastly maintained , mountains and plateaux alike must event- ually be reduced to the condition of plains of erosion . But the modifications of the surface of a mountain- region developed ...
... base - level . Should that base - level be steadfastly maintained , mountains and plateaux alike must event- ually be reduced to the condition of plains of erosion . But the modifications of the surface of a mountain- region developed ...
Page 125
... base - level . But the decay of a mountain - chain does not always proceed without interruption . Not infrequently the base - level is disturbed ; new hori- zontal movements of the crust take place , and bulging- up of the region is ...
... base - level . But the decay of a mountain - chain does not always proceed without interruption . Not infrequently the base - level is disturbed ; new hori- zontal movements of the crust take place , and bulging- up of the region is ...
Page 126
James Geikie. M C renews its youth . On the other hand , the old base- level may be destroyed by subsidence of the crust , and the mountains , partially or wholly drowned , may in time become largely buried under new accumula- tions of ...
James Geikie. M C renews its youth . On the other hand , the old base- level may be destroyed by subsidence of the crust , and the mountains , partially or wholly drowned , may in time become largely buried under new accumula- tions of ...
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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