Earth Sculpture; Or, The Origin of Land-forms |
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Page 60
... infrequently , indeed , these agents play as important a part as the streams them- selves . Under the conditions now described an ele- vated plain will in course of time be cut up into more or less numerous segments , the upper surfaces ...
... infrequently , indeed , these agents play as important a part as the streams them- selves . Under the conditions now described an ele- vated plain will in course of time be cut up into more or less numerous segments , the upper surfaces ...
Page 73
... infrequently flow in the direction of dip , and thus cut across the escarpments , while others may traverse the land along the base of the escarpments . The origin of these phenomena is not hard to trace . Let us suppose that some wide ...
... infrequently flow in the direction of dip , and thus cut across the escarpments , while others may traverse the land along the base of the escarpments . The origin of these phenomena is not hard to trace . Let us suppose that some wide ...
Page 86
... infrequently give rise to an undulating surface . But this surface does not coincide with the deformations of the rocks below . In point of fact , anticlines are not infrequently repre- sented at the surface by depressions , and ...
... infrequently give rise to an undulating surface . But this surface does not coincide with the deformations of the rocks below . In point of fact , anticlines are not infrequently repre- sented at the surface by depressions , and ...
Page 90
... infrequently some coincidence may be observed between the un- dulations at the surface and the underground struct- A.H Nichols FIG . 26. ANTICLINAL RIDGE , GREEN RIVER PLAINS . ( Powell . ) ure . The Colorado district we have described ...
... infrequently some coincidence may be observed between the un- dulations at the surface and the underground struct- A.H Nichols FIG . 26. ANTICLINAL RIDGE , GREEN RIVER PLAINS . ( Powell . ) ure . The Colorado district we have described ...
Page 108
... infrequently appear in a tolerable state of preserva- tion ; while anticlinal beds will often be deeply eroded . Let us , then , turn our attention to the structures met with in such a region as the Alps , and see how far they bear out ...
... infrequently appear in a tolerable state of preserva- tion ; while anticlinal beds will often be deeply eroded . Let us , then , turn our attention to the structures met with in such a region as the Alps , and see how far they bear out ...
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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