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Determining a Fossil’s Age

Determining a Fossil’s Age. Scientists can’t date most fossils directly-Instead , they date the rocks the fossils are found in The oldest rocks are found in lower layers, and the rocks get younger as you move upwards. Relative-Age Dating.

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Determining a Fossil’s Age

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  1. Determining a Fossil’s Age Scientists can’t date most fossils directly-Instead, they date the rocks the fossils are found in The oldest rocks are found in lower layers, and the rocks get younger as you move upwards

  2. Relative-Age Dating By comparing the age of a rock layer to the rock layers near it, scientists can determine the relative age of the rock – and the relative age of any fossils found in that rock layer.

  3. Using Index Fossils Can be used to determine the relative ages of the rocks they were found in Index fossils must follow 2 rules: 1. Must have been widely distributed 2. Must have only lived for a short period of time

  4. Fossil A – 250 – 200 myaFossil C – 400 mya – 100 mya Fossil B – 400 – 100 mya Fossil D – 100 mya - present Index fossils (cont.)

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