Last seen in:
- Thomas Joseph - King Feature Syndicate - Feb 25 2025
- Thomas Joseph - King Feature Syndicate - Oct 31 2024
- Thomas Joseph - King Feature Syndicate - Apr 22 2022
- Thomas Joseph - King Feature Syndicate - May 7 2021
- L.A. Times Daily - Nov 25 2020
- The Washington Post - Nov 25 2020
- Thomas Joseph - King Feature Syndicate - Apr 3 2020
- L.A. Times Daily - Feb 16 2020
- The Washington Post - Feb 16 2020
- USA Today - Aug 20 2017
Related Clues:
- Quite a spell
- One billion years, in astronomy
- Group of eras
- Series of periods
- Vast time period
- Geologic division
- Longest division of geological time
- Forever, figuratively
- Time measured in ages
- Geologist's division
- Astronomical unit
- Countless centuries
- Awfully long time
- Geologic period
- Unbelievably long time