Derrielle194 Derrielle194
  • 04-05-2018
  • Biology
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A type of trilobite is used as an index fossil these fossils were made about 540 million years ago a scientist finds a trilobite fossils in layer 5 apex

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livyloolovesu livyloolovesu
  • 12-05-2018
Fossils in layer 4 are more than 540 million years old.
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