Practical geology

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W. Stewart & Company, 1878 - 157 Seiten
 

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Seite 96 - Themselves, within their holy bound, Their stony folds had often found. They told, how sea-fowls' pinions fail, As over Whitby's towers they sail, And, sinking down, with flutterings faint, They do their homage to the saint.
Seite 47 - It opened with a single blow of the hammer; and there, on a ground of light-coloured limestone, lay the effigy of a creature fashioned apparently out of jet, with a body covered with plates, two powerful-looking arms articulated at the shoulders, a head as entirely lost in the trunk as that of the ray or the sun-fish, and a long angular tail.
Seite 51 - Murchison estimates to be 8,000 to 10,000 feet thick ; and he writes, "the grandest exhibitions of the old red sandstone in England and Wales appear in the escarpments of the Black Mountain of Herefordshire, and in those of the loftiest mountains of South Wales, the Fans of Brecon and Caermarthen, the one 2860, the other 2590 feet above the sea. In no other tract of the world which I have visited is there seen such a mass of red rocks so clearly intercalated between the Silurian and the carboniferous...
Seite 51 - In no other tract of the world visited by me have I seen such a mass of red rocks (estimated at a thickness of not less than 10,000 feet) so clearly intercalated between the Silurian and the Carboniferous strata.
Seite 41 - I had once been working hard, for about five weeks, trying to understand and delineate on the one-inch map, a complicated bit of mountain ground a few miles south of Conway in North Wales. It was made up of interstratified slates, sandstones, and felstones, with large and irregular masses of intrusive greenstone, the exposed parts of each being frequent, but not continuous. Many a weary day had I climbed the sides, and clambered along the crags of a hill some five or six miles in length by two or...
Seite 27 - Catalogue of the Cambrian and Silurian Fossils in the Geological Museum of the University of Cambridge.
Seite 49 - Calamites, and Lepidodendron, or other similar plants, and a shell like our Anodon, three inches across, to which Forbes afterwards, in spite of my remonstrances, insisted on affixing my own inharmonious name as a specific designation.
Seite 68 - FIG. 24. 83. Dolomite is a highly crystalline aggregate of nearly equal parts of carbonate of lime and carbonate of magnesia. It is believed to be a magnesian limestone, rendered compact and crystalline through the joint action of heat and pressure. Dolomite is usually white, but Is also found of various colors. It is extensively used for the manufacture of lime and also as a building stone. No lime is more highly prized by...

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