Geological span

This time we are looking on the crossword clue for: Geological span.
it’s A 15 letters crossword puzzle definition. See the possibilities below.

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Possible Answers: ERA, EON.

Last seen on: –NY Times Crossword 25 May 23, Thursday
Washington Post Crossword Thursday, May 18, 2023
LA Times Crossword, Thu, May 18, 2023
L.A. Times Daily Crossword – Dec 4 2022
NY Times Crossword 5 Jun 22, Sunday