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Fossils are essentially the remains of different animals that lived thousands or millions of years earlier. When these creatures died, they were buried in layers as well as layers of earth. While their flesh would rot away, the tougher parts of their body, such as shells, bones, etc, would certainly remain intact in between the layers of sediment. Now, all those years later, those bones as well as coverings can still be discovered, undamaged, as those layers of sediment are once again unearthed.