Allan Kardec

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6. Although the horizontal is the most normal and usual position of these aqueous formations, one sees, often to a considerable extent in mountainous districts, rocks, which indicate by their nature that they were formed by water in an inclined, and sometimes even in a vertical position. Now, as according to the laws of the equilibrium of liquids and weights, the aqueous deposits can be formed exclusively upon horizontal planes, it is therefore supposed that those which rest on inclined planes are drawn into the lower depths by currents, and by their own weight. It is evident that these deposits have been raised by some force, after their solidification and transformation into stone.

From these considerations we can conclude with certitude that all these stony beds composed of aqueous deposits, in a perfectly horizontal position, have been formed during the succession of ages by tranquil waters; and that, whenever they are found in an inclined position, the Earth has been violently agitated and subsequently broken up by general or partial earthquakes of more or less importance.

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