Advanced Text-book of Geology, Descriptive and IndustrialBlackwood, 1859 - 403 páginas |
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Página 13
... district , and accumulating wide tracts of sand and gravel in bays and other sheltered recesses . By this process thousands of ... districts of country have sunk beneath the waters of the ocean ; while AIM AND METHODS OF THE SCIENCE . 13.
... district , and accumulating wide tracts of sand and gravel in bays and other sheltered recesses . By this process thousands of ... districts of country have sunk beneath the waters of the ocean ; while AIM AND METHODS OF THE SCIENCE . 13.
Página 20
... district adhering to its own verna- cular instead of adopting a uniform system of terminology . The technicalities of science , often so ignorantly inveighed against , are in fact the instruments by which it effects its progress . New ...
... district adhering to its own verna- cular instead of adopting a uniform system of terminology . The technicalities of science , often so ignorantly inveighed against , are in fact the instruments by which it effects its progress . New ...
Página 34
... district , while in winter it is always several degrees higher — thus exercising the function of a great storehouse of heat for modifying and equalising the climates of the adjacent lands . Its mean temperature , from such experi- ments ...
... district , while in winter it is always several degrees higher — thus exercising the function of a great storehouse of heat for modifying and equalising the climates of the adjacent lands . Its mean temperature , from such experi- ments ...
Página 39
... district of comparative rest and stability , what are we to expect over the whole surface of the globe , and especially in regions whose lakes are like our seas , and compared with whose rivers our streams are tiny threads of water ...
... district of comparative rest and stability , what are we to expect over the whole surface of the globe , and especially in regions whose lakes are like our seas , and compared with whose rivers our streams are tiny threads of water ...
Página 45
... districts , and deposit the degraded material in the state of mud , sand , gravel , and shingle in some sheltered locality . Waves , which are the immediate offspring of the winds , are produced more or less on all expanses of water ...
... districts , and deposit the degraded material in the state of mud , sand , gravel , and shingle in some sheltered locality . Waves , which are the immediate offspring of the winds , are produced more or less on all expanses of water ...
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Palavras e frases frequentes
abundant accumulations agency argillaceous arrangement aspect basalts beds bituminous bones calcareous carbonate carboniferous chalk chemical chiefly clay coal coal-measures colour composed composition conglomerates coral crust crustacea crystalline deposits Devonian distinct districts drift earth elevation England eocene epoch estuaries existing extinct fauna feet felspar fishes fissures flint formation forms fossil fresh-water genera genus geological geologist globe gneiss granite gravel greensand greenstone grits heat hence hornblende igneous rocks known lakes laminated land lava layers lias lignites lime limestone lower marine marls masses matter metamorphic mica-schist mineral miocene mountain nature numerous occur ocean Octavo old red sandstone oolite organic origin paleozoic peculiar period Permian phenomena plants and animals pleistocene pliocene present quartz regions remains reptiles rivers sand schists shales shells siliceous silt Silurian species stone strata stratified structure student surface temperature term tertiary texture thickness tion Triassic upper variety vegetable volcanic Wealden
Passagens conhecidas
Página 113 - Bright ran at one time a great hazard, and suffered considerable pain from accidentally plunging one of his legs into the hot clay. * From whatever spot the sulphur is removed, steam instantly escapes ; and, in many places, the sulphur was so hot that we could scarcely handle it. From the smell, I perceived that the steam was mixed with a small quantity of sulphurated hydrogen gas.
Página 321 - ... with beds of oysters, muscles, and other shells adhering to the rocks on which they grew, the fish being all dead, and exhaling most offensive effluvia.
Página 18 - In the preceding chapter we have endeavoured to explain that the object of geology is to investigate the structure of the earth, in as far as that structure is accessible to human investigation. Combining all we know of this rocky structure, from the top of the highest mountain to the bottom of the deepest mine, it forms but an insignificant film of the four thousand miles which lie between the surface and centre of the globe. This film or outer portion is spoken of as the " crust of the globe" in...
Página 113 - At the bottom of this hollow we found a caldron of boiling mud, about fifteen feet in diameter, similar to that on the top of the mountain, which we had seen the evening before ; but this boiled with much more vehemence. We went within a few yards of it, the wind happening to be remarkably favourable for viewing everv part of this singular scene.
Página 275 - Egypt, where it was largely quarried of old for the building of the Pyramids, into Asia Minor, and across Persia by Bagdad to the mouths of the Indus. It occurs not only in Cutch, but in the mountain ranges which separate Scinde from Persia, and which form the passes leading to Caboul ; and it has been followed still farther eastward into India, as far as eastern Bengal and the frontiers of China.
Página 201 - ... water ; but the case is somewhat different with beds of coal. This mineral, being chiefly composed of carbon, hydrogen, and oxygen — the same elements which enter into the composition of plants — and revealing in its mass evidence of vegetable structure, no doubt is entertained of its organic origin. But whether the plants of which it is composed were drifted down by rivers, and deposited along with layers of mud and sand in estuaries, or whether dense forests and peat-mosses were submerged,...