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Fossils are literally the remains of various animals that lived thousands or numerous years ago. When these creatures passed away, they were buried in layers as well as layers of earth. While their flesh would certainly rot away, the tougher parts of their body, such as coverings, bones, etc, would certainly stay intact between the layers of sediment. Currently, all those years later, those bones and also shells can still be discovered, undamaged, as those layers of sediment are once again discovered.