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Fossils are literally the remains of numerous creatures that lived thousands or millions of years earlier. Once these creatures died, they were buried in layers and also layers of planet. While their flesh would rot away, the tougher components of their body, such as coverings, bones, etc, would certainly remain undamaged between the layers of debris. Now, all those years later on, those bones and shells can still be located, intact, as those layers of sediment are once again discovered.