SHALE
Set to 14 different clues across 20 published puzzles, most often “Oil source” — The New York Times, Saturday, 27 June 2009.
5 letters
Every clue on record, most used first
- Oil source6 times
The New York Times — Saturday, 27 June 2009
- Laminated rock2 times
The New York Times — Monday, 19 February 1996
- Fossil sourceonce
The New York Times — Sunday, 19 April 2009
- Slate, originallyonce
The New York Times — Friday, 20 February 2009
- Fossil-yielding rockonce
The New York Times — Sunday, 30 November 2008
- Shelf materialonce
The New York Times — Friday, 3 March 2006
- Fossil mediumonce
The New York Times — Friday, 12 November 2004
- Brick ingredientonce
The New York Times — Saturday, 6 September 2003
- Petroleum sourceonce
The New York Times — Sunday, 9 March 2003
- Mudstoneonce
The New York Times — Friday, 2 August 2002
- Rock that may hold fossilsonce
The New York Times — Thursday, 10 August 2000
- Synfuel sourceonce
The New York Times — Friday, 1 October 1999