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There
had therefore been also at least one change in the basin of that
sea which preceded ours; it had also experienced at least one
revolution: and as several of these inclined strata which it had
formed first are elevated above the level of the horizontal strata
which have           and which surround them, this revolution,
while it gave them their present inclination, had also caused
them to project above the level of the sea so as to form islands,
or at least rocks and inequalities; and this must have happened
whether one of their edges was lifted up above the water, or the
depression of the opposite edge caused the water to subside.