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Relative Age. The age of a rock unit or event relative to the age of another rock unit or event. In other words which layer or event came first , second , third … Ex. Mr. Jensen is older than you are or the sandstone was deposited before the fault occurred. Absolute Age.

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Presentation Transcript
relative age
Relative Age
  • The age of a rock unit or event relative to the age of another rock unit or event.
  • In other words which layer or event came first, second, third…
  • Ex. Mr. Jensen is older than you are orthe sandstone was deposited before the fault occurred
absolute age
Absolute Age
  • An actual year or a range of years (sometimes expressed as a geologicperiod)
  • Can be determined with radiometric dating
  • Can be determined with the use of Index Fossils and Volcanic Time Markers
index fossils
Index Fossils
  • Index fossils (like fads) can help us determine the specific time period that the rock formed
  • The best index fossils are those that lived for a relatively short period of time and over a largearea.
volcanic time markers
Volcanic Time Markers
  • Volcanic ash is sent into the upper atmosphere and is carried all over the Earth
  • Layers of volcanic ash are created all over the Earth.
  • They can be linked to the eruption and dated
not every fossil is an index fossil
Not every Fossil is an Index Fossil
  • Some fossils are not useful for determining the age of a rock because they …
    • Lived for too long a period of time
    • Too small of an area
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