Relative Age

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Relative Age

• The age of a rock unit or event __________ to the
  age of another rock unit or event.
• In other words which layer or event came
  __________, __________, __________
• Ex. Mr. Jensen is older than you are or the
  sandstone was deposited before the fault occurred

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Absolute Age

• An actual year or a range of years (sometimes
  expressed as a __________ __________)
• Can be determined with ____________ dating
• Can be determined with the use of ________
  __________ and __________ __________ __________

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Index Fossils

• Index fossils (like fads) can help us determine
  the __________ __________ __________ that the
  rock formed
• The best index fossils are those that lived for a
  relatively _________ period of time and over a
  __________ area.

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Volcanic Time Markers

• Volcanic ash is sent into the __________
  _______________ and is carried all over the Earth
• __________ of volcanic ash are created all over
  the Earth.
• They can be linked to the __________ and
  __________

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Not every Fossil is an Index Fossil

• Some fossils are not useful for determining the
  age of a rock because they
• Lived for _____ ________ a period of time
• Too __________ of an area