Open-air Studies in Geology |
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Page 3
... mass to a depth of only about a mile . But , as we shall see later , the outer layers of the earth have become wrinkled and folded , so that rocks which once lay far below the surface have been brought up within our reach . Hence in ...
... mass to a depth of only about a mile . But , as we shall see later , the outer layers of the earth have become wrinkled and folded , so that rocks which once lay far below the surface have been brought up within our reach . Hence in ...
Page 22
... , and see clearly that they are of distinct kinds . But in many rocks the mineral particles are exceedingly minute , and the whole mass looks at first as if it were composed of only one kind of material . 22 OPEN - AIR STUDIES.
... , and see clearly that they are of distinct kinds . But in many rocks the mineral particles are exceedingly minute , and the whole mass looks at first as if it were composed of only one kind of material . 22 OPEN - AIR STUDIES.
Page 24
... mass , a flat surface can be produced on part of the rock - specimen by grinding ; it can then be polished , and can be inspected with the lens or microscope . Thus the various mineral constituents may usually be clearly seen in place ...
... mass , a flat surface can be produced on part of the rock - specimen by grinding ; it can then be polished , and can be inspected with the lens or microscope . Thus the various mineral constituents may usually be clearly seen in place ...
Page 30
... mass of the mountain , covered by perhaps twenty feet of the loose gravel with the big stones scattered through it . What we have seen in the side of the great stream is called a section ; it is as if we had cut down into the earth for ...
... mass of the mountain , covered by perhaps twenty feet of the loose gravel with the big stones scattered through it . What we have seen in the side of the great stream is called a section ; it is as if we had cut down into the earth for ...
Page 35
... mass of angular stones , forming a cone stretching up from the lake - shore towards the higher crags . Every groove of the rocks has a cone of this kind at its base ; it is the simplest form of talus , the heap made by the materials ...
... mass of angular stones , forming a cone stretching up from the lake - shore towards the higher crags . Every groove of the rocks has a cone of this kind at its base ; it is the simplest form of talus , the heap made by the materials ...
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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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