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  • Paleontologists search for fossils to help them to determine what types of organisms lived in the same locations and at the same time. They use major changes in the fossil record to divide geologic time into large chunks.
  • The geologic time scale is divided into: eons (biggest), eras, periods, epochs (smallest).
  • Earth's history is divided into four major periods, from oldest to most recent: Precambrian, Paleozoic, Mesozoic, and Cenozoic
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Elza Olson

Lvl 13
3y ago

What else can I help you with?