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Fossils are essentially the remains of various creatures that lived thousands or numerous years ago. As soon as these creatures passed away, they were hidden in layers and layers of earth. While their flesh would rot away, the more challenging parts of their body, such as coverings, bones, etc, would certainly remain intact between the layers of sediment. Currently, all those years later, those bones and also coverings can still be located, intact, as those layers of debris are once more uncovered.