How do scientists determine when an era begins and when it ends?

An era is a period of time established for the purposes of chronology or historiography, such as regnal eras in the history of a monarchy, calendar eras in the history of a calendar, or geological eras in the history of Earth.

And how do scientists determine when an era begins and when it ends?

how do scientists determine when an era begins and when it ends
how do scientists determine when an era begins and when it ends

How do scientists determine when an era begins and when it ends?

  • Scientists determine when an era starts and ends owing to mass extinction. Each major extinction kills around 90% of all creatures. Scientists use the fossil record, which reveals extinct animals from Earth’s history, to identify when major changes occur. Geologists split eras into periods.
  • Due to widespread extinction, scientists determine when an era starts and ends. The fossil record, which displays extinct animals from Earth’s history, helps scientists estimate when significant changes occur.

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