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 the Earth.

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

Due to widespread extinction, scientists determine when an era starts and ends. Each major extinction kills around 90% of all creatures. This causes a significant and noticeable alteration in life. The fossil record, which illustrates the earth’s previous species that have died extinct, helps scientists estimate when significant changes occur.

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