Historical clue formulations

• Chin feature — 2026-09-24
• Chin feature — 2024-12-08
• Like Superman’s chin, famously — 2022-10-24
• Chin dimple — 2021-10-13
• Fissure — 2018-10-27
• Like the rock in "Rock of Ages" — 2016-07-28
• Chin feature — 2015-10-29
• Fissure — 2015-08-02
• Like some chins — 2011-11-15
• Split — 2009-09-21
• Split — 2008-06-22
• Kind of chin — 2007-05-20
• Split — 2006-05-05
• Like the Rock of Ages — 2006-03-25
• Indentation — 2003-09-18
• Fissure — 2002-04-11
• Chin indentation — 1998-04-27