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Relative Dating

Relative Dating. Original Horizontality. Layers of sediment are deposited evenly, with each new layer formed horizontally over older layers. Superposition. In an undeformed sequence of rocks, each layer is younger than the one below. Cross Cutting.

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Relative Dating

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  1. Relative Dating

  2. Original Horizontality • Layers of sediment are deposited evenly, with each new layer formed horizontally over older layers

  3. Superposition • In an undeformed sequence of rocks, each layer is younger than the one below.

  4. Cross Cutting • An igneous intrusion or fault that cuts through preexisting rock is younger than the rock it cuts through

  5. Inclusions • Inclusions are pieces of rock contained within another • Any inclusion is older than the rock containing it.

  6. Faunal Succession • Fossil organisms succeed one another in a definite, irreversible order • Fossils can be used to correlate rocks of similar age in different regions

  7. Unconformities • Disruptions in the rock record caused by folding, uplifting, and erosion

  8. FAULT INTRUSIONS EROSION FOLD

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