Last seen in:
- Universal - Oct 30 2024
- Thomas Joseph - King Feature Syndicate - Dec 30 2022
- Wall Street Journal - Mar 25 2020 - Climbing the Walls
- Newsday.com - Jun 3 2016
- Newsday.com - Aug 9 2015
- USA Today - Feb 26 2014
- Thomas Joseph - King Feature Syndicate - Jan 19 2013
- Thinks.com - May 27 2011
- Thinks.com - May 27 2009
- Premier Sunday - King Feature Syndicate - Oct 19 2008
Related Clues:
- Mud, after compaction
- Mineral in layers
- Rock that underlies Manhattan
- Mineral that could be discharged by seismic activity
- Something fracked in fracking
- Glittery piece in Pueblo pottery
- *Sedimentary rock
- Mineral that can be cleaved
- Flakes in geology class
- Muscovite, e.g
- Source of gas market includes hydrogen
- Fracking target
- Mineral in thin layers
- Mineral used in insulation
- Fuel oil source