Open-air Studies in Geology |
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... origin of Springs 59 4. Section showing principle of Artesian Springs and Wells , and origin of Bournes 60 5. Section of Gorge choked with Alluvium · 6. Section showing a slope of 1 in 17 75 79 FIG . 7. Sections of Alpine valley and ...
... origin of Springs 59 4. Section showing principle of Artesian Springs and Wells , and origin of Bournes 60 5. Section of Gorge choked with Alluvium · 6. Section showing a slope of 1 in 17 75 79 FIG . 7. Sections of Alpine valley and ...
Page 54
... origin ; but in spots where the materials are slate or limestone , or any rock likely to receive scratches easily and yet not to be broken up into powder , we may be rewarded by a rich find of striated stones . Sometimes , under a mere ...
... origin ; but in spots where the materials are slate or limestone , or any rock likely to receive scratches easily and yet not to be broken up into powder , we may be rewarded by a rich find of striated stones . Sometimes , under a mere ...
Page 59
... ORIGIN OF SPRINGS . A , inland heights ; L , limestone ; c , clay . Springs will emerge at B. down this as long as there is some means of escape at the other end . Imagine ( fig . 3 ) a great layer of limestone resting on a layer of ...
... ORIGIN OF SPRINGS . A , inland heights ; L , limestone ; c , clay . Springs will emerge at B. down this as long as there is some means of escape at the other end . Imagine ( fig . 3 ) a great layer of limestone resting on a layer of ...
Page 60
... ORIGIN OF BOURNES . B , pervious stratum ; A and c , impervious strata ; s , sea - level . Bournes may arise at x and x ' , and an Artesian well may be made at w . If we now bore down through the upper impermeable layer , anywhere near ...
... ORIGIN OF BOURNES . B , pervious stratum ; A and c , impervious strata ; s , sea - level . Bournes may arise at x and x ' , and an Artesian well may be made at w . If we now bore down through the upper impermeable layer , anywhere near ...
Page 69
... origin never in these days flood across the whole . By successive downpourings of boulders , the water has slowly raised itself , running upon the central line of the conical slope ; and then , in ordinary weather , it cuts little ...
... origin never in these days flood across the whole . By successive downpourings of boulders , the water has slowly raised itself , running upon the central line of the conical slope ; and then , in ordinary weather , it cuts little ...
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Common terms and phrases
alluvial alluvium Alps andesite augite banks basalt become beds beneath blocks calcium carbonate Chalk character CHARLES GRIFFIN chemical clay cliffs coast colour cone Cretaceous Crown 8vo crust crystalline crystals denudation deposits dykes earth Engineer Eocene escarpment EXETER STREET feet felspars flint flow folded fossils Fully Illustrated Geol Geology glacier glass gneiss grains granite Handsome Cloth hills hollow Hornblende igneous iron Juras Jurassic lake Lake Bonneville land Large 8vo lava layers Leith Hill limestone LONDON lower marine mass material Mesozoic mica miles minerals Miocene mountain occur orthoclase oxide pebbles plain plane Plates Pliocene Practical produced Professor pyroxene quartz region Revised rhyolite ridge rise river rock round salts sand sandstone SECOND EDITION seen shells side silica slope specific gravity steep stones STRAND strata stream structure summit surface TEXT-BOOK unconformity upper valley volcanic Wealden wind
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