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Fossils are essentially the remains of various creatures that lived thousands or millions of years back. As soon as these animals died, they were buried in layers as well as layers of planet. While their flesh would certainly rot away, the harder components of their body, such as shells, bones, etc, would certainly remain intact between the layers of sediment. Now, all those years later on, those bones and also shells can still be discovered, undamaged, as those layers of sediment are again uncovered.