Last seen in:
- Wall Street Journal - Oct 5 2019 - Played Out
- L.A. Times Daily - Dec 22 2017
- The Washington Post - Dec 22 2017
- The Telegraph - QUICK CROSSWORD NO: 28,222 - Sep 17 2016
- New York Times - Mar 6 2016
- New York Times - Dec 7 2014
- L.A. Times Daily - May 3 2009
- L.A. Times Daily - Jul 24 2008
- USA Today - Aug 23 2004
Related Clues:
- Stone/Ice
- Megayears
- What a houseguest's stay might feel like
- Astronomer's time period
- Long time period
- Long interval
- Periods of history
- 1,000,000,000 years
- One billion years, in geologic time
- Waiting period, it sometimes seems
- A billion years, geologically
- Passes the time?
- Division of geological time
- Long geological period
- Very long stretches