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conglomerate a tufa has been formed, where it turned towards Castel
Florentino; farther on, the mud was deposited in which the shells
lived, and which rose in layers according to the levels at which the
turbid Arno flowed into that sea. And from time to time the bottom
of the sea was raised, depositing these shells in layers, as may be
seen in the cutting at Colle Gonzoli, laid open by the Arno which is
wearing away the base of it; in which cutting the said layers of
shells are very plainly to be seen in clay of a bluish colour, and
various marine objects are found there. And if the earth of our
hemisphere is indeed raised by so much higher than it used to be, it
must have become by so much lighter by the waters which it lost
through the rift between Gibraltar and Ceuta; and all the more the
higher it rose, because the weight of the waters which were thus
lost would be added to the earth in the other hemisphere. And if the
shells had been carried by the muddy deluge they would have been
mixed up, and separated from each other amidst the mud, and not in
regular steps and layers-- as we see them now in our time.
The marine shells were not produced away from the sea.
9
88.
As to those who say that shells existed for a long time and were
born at a distance from the sea, from the nature of the place and of
the cycles, which can influence a place to produce such
creatures--to them it may be answered: such an influence could not
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