Related Clues:
- Annals of history
- Time chunks
- Historic chapters
- Pitching numbers
- Big slices of history
- Noteworthy historical periods
- Periods of interest
- Aces' are low
- Victorian and Cenozoic
- Periods of historical note
- Box score stats
- They're often associated with world leaders
- Paleozoic et al.
- Chapters in a history book, perhaps
- Notable times in history