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Fossils are actually the remains of different creatures that lived thousands or millions of years back. When these animals passed away, they were buried in layers and layers of planet. While their flesh would rot away, the more difficult parts of their body, such as coverings, bones, etc, would stay intact between the layers of sediment. Currently, all those years later on, those bones and also shells can still be discovered, undamaged, as those layers of sediment are again unearthed.