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Relative and Absolute Age Law of Superposition

Learn about relative and absolute dating methods to determine the age of rocks, including the Law of Superposition. Discover how these techniques provide insights into the Earth's geologic history.

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Relative and Absolute Age Law of Superposition

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  1. Relative and Absolute AgeLaw of Superposition

  2. Relative and Absolute DatingThere are two major ways to date geologic events:Relative dating-how old a rock is compared to surrounding rocksAbsolute dating-actual number of years since the rock was formed

  3. Relative DatingThe various relative dating methods tell you whether a specific rock or layer of rocks is younger or older as compared to surrounding rocksThis type of dating does not give an exact age for the rock

  4. The Law of Superposition states that in an undisturbed sequence of sedimentary rock:Each layer is older than the one aboveEach layer is younger than the one below

  5. Law of Superposition • a vertical set of strata (layers) is a chronological record of the geologic history of that strata • Youngest layers are on top and oldest on bottom

  6. Law of Superposition

  7. Absolute Dating • Absolute dating can give you the exact age of a rock • This is accomplished using radioactive dating, which is also referred to as radiometric dating • Based on the regular radioactive decay of certain elements

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