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Fossils. are remains of hard parts of life forms found in rocks. The remnants or impressions of living organisms from the remote past may be regarded as fossils. Fossil formation involve the burial of dead organism. Layer after layer of sediment is laid above the dead organism. It is only on this account that the oldest fossils are found in the deepest layers of the earth's surface while the fossils of recent origin are found in the upper layers. Thus by examining the various layers of earth from the deepest to the most superficial strata for fossil record, the story of life in correct historical sequence can be known.