Period of history

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Possible Answers:

ERA.

Last seen on: –NY Times Crossword 7 Apr 21, Wednesday
USA Today Crossword – Feb 5 2021
Universal Crossword – Aug 7 2020
Universal Crossword – May 27 2020
Wall Street Journal Crossword – April 07 2020 – Keep Going!
Thomas Joseph – King Feature Syndicate Crossword – Mar 30 2020
Wall Street Journal Crossword – November 11 2019 – Reading Between The Lines
Universal Crossword – Jul 2 2019

Random information on the term “ERA”:

A geologic era is a subdivision of geologic time that divides an eon into smaller units of time. The Phanerozoic Eon is divided into three such time frames: the Paleozoic, Mesozoic, and Cenozoic (meaning “old life”, “middle life” and “recent life”) that represent the major stages in the macroscopic fossil record. These eras are separated by catastrophic extinction boundaries, the P-T boundary between the Paleozoic and the Mesozoic and the K-Pg boundary between the Mesozoic and the Cenozoic. There is evidence that catastrophic meteorite impacts played a role in demarcating the differences between the eras.

The Hadean, Archean and Proterozoic eons were as a whole formerly called the Precambrian. This covered the four billion years of Earth history prior to the appearance of hard-shelled animals. More recently, however, the Archean and Proterozoic eons have been subdivided into eras of their own.

Geologic eras are further subdivided into geologic periods, although the Archean eras have yet to be subdivided in this way.

ERA on Wikipedia