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Fossils are literally the remains of various creatures that lived thousands or countless years earlier. As soon as these creatures died, they were buried in layers as well as layers of planet. While their flesh would certainly rot away, the tougher parts of their body, such as coverings, bones, etc, would remain intact between the layers of debris. Currently, all those years later on, those bones and shells can still be found, undamaged, as those layers of debris are once again discovered.