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Fossils are actually the remains of numerous animals that lived thousands or millions of years back. As soon as these animals died, they were hidden in layers and layers of planet. While their flesh would rot away, the more difficult parts of their body, such as shells, bones, etc, would certainly stay undamaged between the layers of sediment. Currently, all those years later, those bones and coverings can still be located, undamaged, as those layers of debris are again uncovered.