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Relative and Absolute Age Law of Superposition. Relative and Absolute Dating There are two major ways to date geologic events: Relative dating-how old.

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Presentation on theme: "Relative and Absolute Age Law of Superposition. Relative and Absolute Dating There are two major ways to date geologic events: Relative dating-how old."— Presentation transcript:

1 Relative and Absolute Age Law of Superposition

2 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

3 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

4 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

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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