Earth Sculpture; Or, The Origin of Land-forms |
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Page 9
... angle of inclination is the same on each side of the anticline ; in other words , the anticlinal axis ( X - Y ) is vertical . From A to B the distance we shall suppose is six miles . The succeeding section ( Fig . 3 ) we shall take to ...
... angle of inclination is the same on each side of the anticline ; in other words , the anticlinal axis ( X - Y ) is vertical . From A to B the distance we shall suppose is six miles . The succeeding section ( Fig . 3 ) we shall take to ...
Page 21
... angles to the planes of bed- ding . In certain fine - grained rocks , such as basalt , the jointing is often very regular , giving rise to a prismatic columnar structure , as in the basalts of Staffa and the Giant's Causeway . The main ...
... angles to the planes of bed- ding . In certain fine - grained rocks , such as basalt , the jointing is often very regular , giving rise to a prismatic columnar structure , as in the basalts of Staffa and the Giant's Causeway . The main ...
Page 49
... angle that they often appear to the eye level , or approximately so . This gently sloping surface is an original configuration , for it corresponds with the structure of the various under- lying deposits , the general inclination or dip ...
... angle that they often appear to the eye level , or approximately so . This gently sloping surface is an original configuration , for it corresponds with the structure of the various under- lying deposits , the general inclination or dip ...
Page 53
... angle of one degree , then for every eleven miles of distance it will lose 1000 feet of ele- vation . Now , in the Grand Cañon district the gen- eral inclination of the strata is towards north and 600022000 north - east , while the ...
... angle of one degree , then for every eleven miles of distance it will lose 1000 feet of ele- vation . Now , in the Grand Cañon district the gen- eral inclination of the strata is towards north and 600022000 north - east , while the ...
Page 60
... angles . Horizontal strata are in this way divided up into rudely cuboidal , quadrangu- lar , or rectangular blocks . Joints are , of course , lines of weakness along which , when rocks are undermined , they tend to give way . Thus when ...
... angles . Horizontal strata are in this way divided up into rudely cuboidal , quadrangu- lar , or rectangular blocks . Joints are , of course , lines of weakness along which , when rocks are undermined , they tend to give way . Thus when ...
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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