This time we are looking on the crossword puzzle clue for: Significant period.
it’s A 18 letters crossword definition.
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Last seen on: –USA Today Crossword – Jan 29 2021
–Newsday.com Crossword – Oct 22 2020
–USA Today Crossword – Oct 20 2020
–Newsday.com Crossword – Aug 9 2020
–LA Times Crossword 5 Aug 19, Monday
Newsday.com Crossword – Jun 16 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.