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Beneath overhanging ledges of limestone, quantities of fine earthy rubbish can be seen, weathered off from such causes. In these I have detected sulphate of lime, sulphate of magnesia, nitrate of lime, and occasionally sulphate of soda. The tendency which some calcareous rocks have to produce nitrate of lime is, probably, one of the greatest causes of disintegration."
But not alone has this Leviathan left his pre-adamite traces in the stereotype plates of nature, and in limestone and marl bequeathed his ancient bust; but upon Egyptian tablets, whose antiquity seems to claim for them an almost fossiliferous character, we find the unmistakable print of his fin.
The caverns in mountains of gypsum often contain mephitic emanations and deleterious gases. It is not the sulphate of lime that acts on the atmospheric air, but the clay slightly mixed with carbon, and the fetid limestone, so often mingled with the gypsum. It is only by decomposition that it becomes white, after having acted on the surrounding air.
To take this trip, the trail passes the mine, eastward, down a steep break in the red-wall limestone, zigzagging back and forth. Passing under overhanging cliffs, it leads down until the plateau is reached, where twenty years ago I saw bands of mountain sheep.
So long as the Egyptian walls remain standing, the blocks of limestone, sandstone, or granite of which they are composed, can never be entirely freed from the images, that is, from the expression of the thoughts, cut upon them by the men of forty centuries ago. In Assyria the case was different.
I missed the sharp outlines, the delicate artistic sky lines, sharply defined in uplifted bare granite peaks and ridges, with the purple and violet color of the northern mountains, and which it seems to me that limestone and granite formations give. There are none of the great gorges and awful abysses of the White Mountains, both valleys and mountains here being more uniform in outline.
The same weather continued day after day, and it is almost impossible to find words to express the beauty of the grey reflection of the islands and the reeds, and the faint evanescent shores floating away, disappearing in the sun-haze, and the silence about the shores, a kind of enchanted silence, interrupted, as I have said, only by the low gurgle of the water about the limestone shingle.
Before sunrise we reached the summit of a narrow ridge, trending East-South-East 1/2 a mile east, from where the boats were lying: in this singular ridge I again noticed the dip to the south-east: it was composed of a variety of rocks, jasper, a greyish kind of flinty indifferent limestone, and greywacke.
The Monastery is of fresh-looking Gothic, by Pugin the first of the dynasty: it is reached by the white roads of a limestone country, and backed by a young plantation, and it gathers its group of buildings in a cleft high up among the hills of Wales.
Miller answered, his eye at the instrument. "But why anyone should use powdered rock and then hide the bags certainly escapes me. I can't imagine what the powder is for. It isn't a powdered limestone, which might be used on the fields. The crystal structure is wrong for that." "Wish we had a geologist with us," Rick said. "This calls for an expert." He stared helplessly at the microscope.
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