A geological manual

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Carey & Lea, 1832 - Geology - 535 pages
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Page 108 - After walking some distance over the sunken plain, which in several places sounded hollow under our feet, we at length came to the edge of the great crater, where a spectacle, sublime and even appalling, presented itself before us —
Page 49 - Yet no beds are more stable than clay when the velocities do not exceed this : for the water even takes away the impalpable particles of the superficial clay, leaving the particles of sand sticking by their lower half in the rest of the clay, which they now protect, making a very permanent bottom, if the stream does not bring down gravel or coarse sand, which will rub off this very thin crust, and allow another layer to be worn off. A velocity of six inches will lift fine sand, eight inches will...
Page 369 - Ichthyosaurus has the snout of dolphin, the teeth of a crocodile, the head and sternum of a lizard, the extremities of...
Page 102 - This stream is probably generated by the great accumulation of water on the eastern coast of America between the tropics, by the trade-winds which constantly blow there. It is known that a large piece of water ten miles broad and generally only three feet deep, has by a strong wind had its waters driven to one side and sustained so as to become six feet deep, while the windward side was laid dry. This...
Page 115 - At six o•clock the next morning it continued as dark as ever, but began to clear at half-past seven; and about eight o•clock objects could be faintly discerned upon deck. From this time it began to get lighter very fast. " The appearance of the ship when daylight returned was most singular, every part being covered with the falling matter: it had the appearance of calcined pumice-stone, nearly the colour of wood ashes ; it lay in heaps of a foot in depth...
Page 107 - The surface of this plain was uneven, and strewed over with large stones and volcanic rocks, and in the centre of it was the great crater, at the distance of a mile and a half from the precipice on which we were standing.
Page 4 - That there is no notable difference in sea-water under different meridians. 4. That there is no satisfactory evidence that the sea at great depths is more salt than at the surface. 5. That the sea in general contains more salt where it is deepest and most remote from land, and that its saltncss is always diminished in the vicinity of large masses of ice.
Page 108 - The bottom was covered with lava, and the south-west and northern parts of it were one vast flood of burning matter, in a state of terrific ebullition, rolling to and fro its " fiery surge
Page 502 - Mr. Carne has observed, regarding the metalliferous veins of Cornwall, that it is a rare circumstance when a vein, which has been productive in one species of rock, continues rich long after it has entered into another; and this change, he adds, is even remarked when the same rock becomes harder or softer, more slaty or more compact. Hence it was very unlikely that the Wisconsin lead ore, so rich in the cliff limestone, should retain the same...
Page 33 - ... which the principal are, that rocks may be divided into two great classes, the stratified and the unstratified ; that of the former some contain organic remains and others do not; and that the...

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