Earth Sculpture; Or, The Origin of Land-forms |
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Page 47
... movement , the surface - features are such as only epigene action can account for . Original irregularities of the ground ... movements . In the opinion of most geologists they are due to the secular cooling of the earth . As the nucleus ...
... movement , the surface - features are such as only epigene action can account for . Original irregularities of the ground ... movements . In the opinion of most geologists they are due to the secular cooling of the earth . As the nucleus ...
Page 48
... movements there are vertical movements of the crust , typically repre- sented by the dislocations known as normal faults . Normal faults are more or less vertical displacements , often of small amount , but not infrequently very great ...
... movements there are vertical movements of the crust , typically repre- sented by the dislocations known as normal faults . Normal faults are more or less vertical displacements , often of small amount , but not infrequently very great ...
Page 56
... movements began - elevation ensued , and the sea finally retired from the district . An ex- tensive lake now ... movement was differential , the greatest rise having been experienced by the uplands surrounding the la- custrine basin ...
... movements began - elevation ensued , and the sea finally retired from the district . An ex- tensive lake now ... movement was differential , the greatest rise having been experienced by the uplands surrounding the la- custrine basin ...
Page 57
... movements of 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 ...
... movements of 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 ...
Page 66
... movement of 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 ...
... movement of 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 ...
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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