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Fossils are essentially the remains of various creatures that lived thousands or countless years ago. When these animals died, they were hidden in layers as well as layers of earth. While their flesh would rot away, the tougher components of their body, such as shells, bones, etc, would certainly stay intact between the layers of debris. Currently, all those years later on, those bones and shells can still be located, undamaged, as those layers of debris are again uncovered.