Historical clue formulations

• Rocky debris — 2024-12-01
• Patch of loose rock that aptly rhymes with "debris" — 2022-09-05
• Rocky debris — 2022-02-16
• Patch of loose rocks at the base of a cliff — 2018-04-26
• Cliffside detritus — 2015-12-04
• Rocky debris — 2015-10-18
• Mountainside debris — 2010-05-14
• Cliffside detritus — 2009-01-30
• Cliffside detritus — 2008-08-02
• Mountain debris — 2004-01-06
• Loose rock debris — 2003-06-29
• Rocky debris — 2001-08-17
• Detritus on the side of a mountain — 1997-12-27
• Rock debris — 1994-11-23
• Landslide detritus — 1994-10-30
• Rocky debris — 1994-01-09