Earth Sculpture; Or, The Origin of Land-forms |
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Page 18
... 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 . How , then , are rocks being affected at present ? We do not pro- ceed far in our ...
... 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 . How , then , are rocks being affected at present ? We do not pro- ceed far in our ...
Page 19
... rocks . We have already taken note of the fact that rocks are of various origin -igneous , derivative , and metamorphic . It is now necessary to consider their composition and structure , for , according as these differ , rocks are ...
... rocks . We have already taken note of the fact that rocks are of various origin -igneous , derivative , and metamorphic . It is now necessary to consider their composition and structure , for , according as these differ , rocks are ...
Page 20
... rocks occur either in more or less regular beds ( lavas ) , interstrati- fied with derivative rocks , or they penetrate these in the form of irregular veins , dykes , sheets , or large amorphous masses . The lava - form rocks are often ...
... rocks occur either in more or less regular beds ( lavas ) , interstrati- fied with derivative rocks , or they penetrate these in the form of irregular veins , dykes , sheets , or large amorphous masses . The lava - form rocks are often ...
Page 21
... rocks are traversed by cracks and fissures of one sort or another . It is further to be noted that these rocks , in common with rocks of all kinds , are more or less porous , and therefore liable to be permeated , however slowly , by ...
... rocks are traversed by cracks and fissures of one sort or another . It is further to be noted that these rocks , in common with rocks of all kinds , are more or less porous , and therefore liable to be permeated , however slowly , by ...
Page 22
James Geikie. gravel - rocks , or conglomerates , usually consist of rounded fragments of quartz or some hard silicious rock . But to this there are exceptions , the stones in some conglomerates consisting of calcareous or of felspathic ...
James Geikie. gravel - rocks , or conglomerates , usually consist of rounded fragments of quartz or some hard silicious rock . But to this there are exceptions , the stones in some conglomerates consisting of calcareous or of felspathic ...
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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