Relative Dating

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Relative Dating

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Original Horizontality

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

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Superposition

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

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Cross Cutting

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

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Inclusions

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

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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

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Unconformities

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

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FAULT
INTRUSIONS
EROSION
FOLD