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FOSSILS.
Fossils are the remains or traces of former living creatures
or plants now preserved in the rocks. Some kinds of rock, e.g.
limestone, consist entirely of the remains of plants and animals
in various stages of decay and decomposition; but nearly every
kind of sedimentary rock may be more or less fossiliferous.
The parts whose form is preserved may be the bones, teeth or
shells of animals (chiefly marine); the bark, wood, leaves or
seeds of plants; and even the foot prints or tracks of animals.
Sometimes,
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