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Fossils are actually the remains of various animals that lived thousands or millions of years earlier. As soon as these animals passed away, they were buried in layers as well as layers of earth. While their flesh would rot away, the more challenging parts of their body, such as shells, bones, etc, would certainly stay intact in between the layers of debris. Currently, all those years later on, those bones and shells can still be located, intact, as those layers of sediment are once again unearthed.