Relative age
This presentation is the property of its rightful owner.
Sponsored Links
1 / 13

Relative Age PowerPoint PPT Presentation


  • 91 Views
  • Uploaded on
  • Presentation posted in: General

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.

Download Presentation

Relative Age

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

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


  • Login