Quotation from: The Notebooks of Leonardo Da Vinci

Written by: Leonardo da Vinci


That the Northern bases of some Alps are not yet petrified. And this
is plainly to be seen where the rivers, which cut through them, flow
towards the North; where they cut through the strata in the living
stone in the higher parts of the mountains; and, where they join the
plains, these strata are all of potter's clay; as is to be seen in
the valley of Lamona where the river Lamona, as it issues from the
Appenines, does these things on its banks.

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