Last seen in:
- Newsday.com - Apr 21 2022
- Newsday.com - May 2 2021
- Newsday.com - Oct 24 2019
- Universal - Jan 15 2019
- The Times - Concise - Times Concise No 7702
- The Times - Concise - Times Concise No 7670
- The Times - Concise - Times Concise No 7665
- Wall Street Journal - May 22 2018 - Rollbacks
- The Times - Concise - Times Concise No 7633
- The Times - Concise - Times Concise No 7462
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