Earth Sculpture; Or, The Origin of Land-forms |
From inside the book
Page 14
... elevation . In the case of the horizontal strata shown in Fig . I we have no difficulty in perceiving that the present surface is not that of original deposition . It is impos- sible that sedimentary deposits could have been piled up in ...
... elevation . In the case of the horizontal strata shown in Fig . I we have no difficulty in perceiving that the present surface is not that of original deposition . It is impos- sible that sedimentary deposits could have been piled up in ...
Page 56
... elevation ensued , and the sea finally retired from the district . An ex- tensive lake now occupied the site of the plateau- country for a prolonged period , during which sediments were washed down as before from the neighbouring ...
... elevation ensued , and the sea finally retired from the district . An ex- tensive lake now occupied the site of the plateau- country for a prolonged period , during which sediments were washed down as before from the neighbouring ...
Page 57
... elevation , and the prevalent horizontality of the strata was modified . Here and there the beds were bent or flexed , and traversed by great fractures along which the strata became vertically displaced for thousands of feet . Yet ...
... elevation , and the prevalent horizontality of the strata was modified . Here and there the beds were bent or flexed , and traversed by great fractures along which the strata became vertically displaced for thousands of feet . Yet ...
Page 65
... . But the minimum level to which a region tends to be reduced need not be at such a low elevation . The streams and rivers dis- S charging into a great lake or inland sea cannot erode LAND - FORMS IN HORIZONTAL STRATA 65.
... . But the minimum level to which a region tends to be reduced need not be at such a low elevation . The streams and rivers dis- S charging into a great lake or inland sea cannot erode LAND - FORMS IN HORIZONTAL STRATA 65.
Page 66
... elevation affect the lower end of the great lake , and thus , by counterbalancing the work of river erosion at its outlet , maintain the surface at approximately the same level for a pro- longed period of time , then denudation may ...
... elevation affect the lower end of the great lake , and thus , by counterbalancing the work of river erosion at its outlet , maintain the surface at approximately the same level for a pro- longed period of time , then denudation may ...
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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