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Related Clues:
- Subdivisions of eons
- Things sometimes named after presidents
- Paleozoic, Mesozoic and so on
- Some historical periods
- Heroines oddly ignored for long periods
- Periods whose names often end in "zoic"
- Forever and a day, say
- Periods longer than eras
- Docked 7 times
- Long stretches of time
- Ages in Westgate-on-Sea
- Chronological stretches
- Archean and Hadean, e.g
- Sections of history books
- Long periods of recounts, periodically