Earth Sculpture; Or, The Origin of Land-forms |
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Page 9
... present we need not do more than make some general acquaintance with them . A very common arrangement is shown in the next diagram ( Fig . 2 ) . Here the strata are arranged in the form of a truncated arch , or anticline . At X the X ...
... present we need not do more than make some general acquaintance with them . A very common arrangement is shown in the next diagram ( Fig . 2 ) . Here the strata are arranged in the form of a truncated arch , or anticline . At X the X ...
Page 12
... present , we need only keep in view the prominent fact that the existing land - surfaces of the globe are composed most frequently of marine strata . There are apparently only two ways in which this phenom- enon can be accounted for ...
... present , we need only keep in view the prominent fact that the existing land - surfaces of the globe are composed most frequently of marine strata . There are apparently only two ways in which this phenom- enon can be accounted for ...
Page 14
... present surface is not that of original deposition . It is impos- sible that sedimentary deposits could have been piled up in the shape of great pyramids : obviously the beds . were formerly continuous , as shown by the dotted lines ...
... present surface is not that of original deposition . It is impos- sible that sedimentary deposits could have been piled up in the shape of great pyramids : obviously the beds . were formerly continuous , as shown by the dotted lines ...
Page 15
... present surface A - B . Such dislocations often interrupt the continuity of the strata in our coal- fields . In such regions we may traverse level or gently undulating tracts , and be quite unconscious of the fact that geologically we ...
... present surface A - B . Such dislocations often interrupt the continuity of the strata in our coal- fields . In such regions we may traverse level or gently undulating tracts , and be quite unconscious of the fact that geologically we ...
Page 18
... present , geologists tell us , contains the key to the past . If we wish to find out how rocks have been removed , and what has since become of them , we must observe what is taking place under the influence of existing agents of change ...
... present , geologists tell us , contains the key to the past . If we wish to find out how rocks have been removed , and what has since become of them , we must observe what is taking place under the influence of existing agents of change ...
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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