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Fossils are literally the remains of various creatures that lived thousands or countless years ago. Once these animals passed away, they were buried in layers and layers of earth. While their flesh would rot away, the more difficult components of their body, such as coverings, bones, etc, would certainly stay undamaged between the layers of sediment. Currently, all those years later, those bones and shells can still be found, undamaged, as those layers of sediment are once again unearthed.