Geologic Time Scale and Fossil Record

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Fossil Record

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The mineralized remains of organisms and the rock layers in which they are found.

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Law of Superposition

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States that fossils located in deeper sediment layers are older.

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Deposited

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Small pieces of material that are dropped and settle in one place.

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Fossil

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The preserved remains or trace of an organism.

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Rock Strata

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Layers of sedimentary rock mostly having the same composition.

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Geologic Time Scale

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A system of chronological dating that relates geological strata to time.

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Sedimentary Rock

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Rock formed by the accumulation of sediment.

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Trace Fossil

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A fossil that records the activity of an organism, such as footprints.

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Index Fossil

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A fossil that is used to define and identify a particular time period.

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Absolute Dating

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A method of determining the exact age of a fossil or rock.