Index Fossils


These fossils are extremely important because they help us discern the various periods on the geological time scale. Some organisms only lived for a definite and short amount of period. Therefore, if you see an index fossil in a piece of sediment, you can discern the time period and age of the sediment. If there are other fossils in the sediment then you can then date the other fossil. Ideally index fossils should be easily identifiable and prevalent so they can serve as reference points.

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