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Fossils are essentially the remains of various creatures that lived thousands or millions of years ago. When these animals passed away, they were buried in layers as well as layers of earth. While their flesh would rot away, the more difficult parts of their body, such as shells, bones, etc, would certainly stay intact between the layers of sediment. Currently, all those years later on, those bones and also coverings can still be located, intact, as those layers of debris are once more uncovered.