Advanced Text-book of Geology, Descriptive and IndustrialBlackwood, 1859 - 403 páginas |
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Página 9
... UPPER OR TRUE COAL - MEASURES , I. Lower Coal Measures or Carboniferous Slates , II . Mountain or Carboniferous Limestone , III . The Upper Coal Measures , Physical and Geographical Aspects , Industrial Products , 182-205 183 186 190 ...
... UPPER OR TRUE COAL - MEASURES , I. Lower Coal Measures or Carboniferous Slates , II . Mountain or Carboniferous Limestone , III . The Upper Coal Measures , Physical and Geographical Aspects , Industrial Products , 182-205 183 186 190 ...
Página 23
... upper limit . Through it the heat and light of the sun are equally diffused and modified ; and it is also the great recipient and diffuser of all watery vapours arising from the earth . Local alterations in its density or expan ...
... upper limit . Through it the heat and light of the sun are equally diffused and modified ; and it is also the great recipient and diffuser of all watery vapours arising from the earth . Local alterations in its density or expan ...
Página 31
... upper from the lower wind - currents . - It has often been surmised , and even asserted , by some of our highest authorities , that the diminished atmospheric pressure which takes place at great elevations may have some direct effect in ...
... upper from the lower wind - currents . - It has often been surmised , and even asserted , by some of our highest authorities , that the diminished atmospheric pressure which takes place at great elevations may have some direct effect in ...
Página 71
... upper surface of a stratum may be smooth , or it may be rough and irregular , and the under surface of the stratum laid above it must partake of this smooth- ness or this irregularity : this is bedding ; the line that marks this ...
... upper surface of a stratum may be smooth , or it may be rough and irregular , and the under surface of the stratum laid above it must partake of this smooth- ness or this irregularity : this is bedding ; the line that marks this ...
Página 80
... Upper Egypt , where it was early quarried . There are several varieties of granite arising from such interchanges of minerals , but these will be noticed when we come to treat of the granites as a geological group . Basalt - Greenstone ...
... Upper Egypt , where it was early quarried . There are several varieties of granite arising from such interchanges of minerals , but these will be noticed when we come to treat of the granites as a geological group . Basalt - Greenstone ...
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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,...