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Index fossils Fossils that are assumed to represent a certain period in earth's past. Geological column A theoretical picture in which layers of rock from around the world are meshed together into a single, unbroken record of earth's past. The Theory of Evolution A theory stating that all of life on this earth has one (or a few), common ancestor(s) that existed a long time ago. Paraconformity An uncomformity for which there is no evidence but some geologists think should exist.