Advanced Text-book of Geology, Descriptive and IndustrialBlackwood, 1859 - 403 páginas |
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Página 8
... SILURIAN SYSTEM , EMBRACING THE Lower and UPPER SILURIAN GROUPS , OR THE LLANDEILO , WENLOCK , AND LUDLOW SERIES , Lithological Composition , Palæontological Characteristics , Physical Aspects , Industrial Products , · 148-164 151 153 ...
... SILURIAN SYSTEM , EMBRACING THE Lower and UPPER SILURIAN GROUPS , OR THE LLANDEILO , WENLOCK , AND LUDLOW SERIES , Lithological Composition , Palæontological Characteristics , Physical Aspects , Industrial Products , · 148-164 151 153 ...
Página 90
... SILURIAN SYSTEM , embracing the upper and lower silurian groups , or the Ludlow , Wenlock , and Llandeilo series . Remains of peculiar crustaceans , mollusca , radiata , and zoophytes . Few fishes have yet been discovered , and these ...
... SILURIAN SYSTEM , embracing the upper and lower silurian groups , or the Ludlow , Wenlock , and Llandeilo series . Remains of peculiar crustaceans , mollusca , radiata , and zoophytes . Few fishes have yet been discovered , and these ...
Página 91
... silurian , for instance , might be absent , and the coal in this case might rest on the clay - slate ; or the new red sandstone and oolite might be absent , and chalk might rest on the coal ; or even all of these might be wanting , and ...
... silurian , for instance , might be absent , and the coal in this case might rest on the clay - slate ; or the new red sandstone and oolite might be absent , and chalk might rest on the coal ; or even all of these might be wanting , and ...
Página 92
... Silurian epoch . Non - fossiliferous epoch , or { Metamorphic system . Instead of this arrangement it has been proposed by some to substitute the following as sufficiently distinctive and more philosophical- NEOZOIC PERIOD ( New Life ) ...
... Silurian epoch . Non - fossiliferous epoch , or { Metamorphic system . Instead of this arrangement it has been proposed by some to substitute the following as sufficiently distinctive and more philosophical- NEOZOIC PERIOD ( New Life ) ...
Página 95
... Silurian system . 10. Metamorphic system . The first nine of these systems are spoken of as the Fossiliferous Rocks , because they contain , less or more , the remains of plants and animals ; the rocks of the last , which contain no ...
... Silurian system . 10. Metamorphic system . The first nine of these systems are spoken of as the Fossiliferous Rocks , because they contain , less or more , the remains of plants and animals ; the rocks of the last , which contain no ...
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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
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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,...