Related Clues:
- Geologist's span
- Largest division of geologic time
- Evolutionary time period
- Long stretch of history
- Wisk rival
- NOW political cause, once
- Stat for Cliff Lee
- D.C. human rights act not yet ratified by Congress
- Eventful period
- It may end in -zoic
- Centuries on end
- Long time, even in the singular
- Quite a span
- Pretty big stretch?
- Swing ___ (1920s-30s)