Our Planet Its Past And Future Or Lectures On Geology

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Dr. Darwin, in his " Botanic Garden, " referring to this mine, says, " Thus caverned round in Cracow's mighty mines, With crystal walls a gorgeous city shines ; Scooped in the briny rock, long streets extend Their hoary course, and glittering domes ascend; Down the bright steeps, emerging into day, Impetuous fountains burst their headlong way, O'er milk-white vales in ivory channels spread, And, wandering, seek their subterranean bed. " The question very naturally presents itself, Whence came t...hese enormous masses of salt ? There was a time when they were not, and a time when they began to be. Some have suggested, that salt being in some places a volcanic product, salt-springs flowing in the neighbor- hood of many volcanoes, these saline deposits may have been formed at some past time, during a period of great volcanic activity ; the salt carried into lake-basins, and there evaporated.
Their origin has also been referred to the evaporation of the water of ordinary salt-lakes, leaving the salt as a sediment.


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