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Relative and Absolute Age Law of Superposition

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

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

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

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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

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Law of Superposition

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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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