It may appear inconceivable to a beginner how mountains, several
thousand feet thick, can have become full of fossils from top to
bottom; but the difficulty is removed, when he reflects on the
origin of stratification, as explained in the last chapter, and
allows sufficient time for the accumulation of sediment. He must
never lose sight of the fact that, during the process of
deposition, each separate layer was once the uppermost, and
immediately in contact with the water in which aquatic animals
lived.
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