Historical clue formulations

• Mountain ridge — 2018-06-23
• Rocky glacial ridge — 2017-05-09
• Mountain ridge — 2016-08-04
• Mountain ridge — 2016-07-11
• Glacial ridge — 2015-08-06
• Glacial ridge — 2014-03-05
• Formation from glaciation — 2013-12-14
• Rocky ridge — 2013-05-21
• Mountain ridge — 2013-01-01
• Mountain ridge — 2012-08-05
• Rocky ridge — 2012-04-25
• Sharp-crested ridge — 2012-03-01
• Mountain ridge — 2011-07-24
• Excellence as a virtue, to ancient Greeks — 2011-02-03
• Rocky ridge — 2011-02-02
• Alpine feature — 2010-02-18
• Alpine feature — 2010-02-06
• Craggy ridge — 2009-11-08
• Craggy crest — 2009-06-25
• Mountain ridge — 2009-03-18
• Sharp ridge — 2009-02-15
• Craggy ridge — 2008-06-18
• Mountain ridge — 2007-12-30
• Glacial ridge — 2007-12-26
• Mountain ridge — 2006-10-29
• Mountain crest — 2006-05-03
• Rocky ridge — 2005-11-04
• Rocky ridge — 2005-08-04
• Rugged ridge — 2004-10-05
• Sharp ridge — 2004-06-23
• Rocky prominence — 2004-05-22
• Rugged ridge — 2002-12-22
• Mountain ridge — 2002-06-18
• Ridge — 2002-01-27
• Rugged ridge — 2001-07-08
• Glacial ridge — 2001-04-04
• Rugged ridge — 2000-12-03
• Rugged ridge — 2000-03-12
• Mountain ridge — 2000-02-15
• Range ridge — 1999-11-20
• Mountain crest — 1999-10-10
• Mountain ridge — 1999-06-06
• Rocky ridge — 1999-05-24
• Alpine feature — 1998-05-22
• Mountain ridge — 1997-12-03
• Sharp ridge — 1997-04-18
• Geological feature — 1996-03-10
• Rugged ridge — 1995-08-13
• Mountain crest — 1995-06-14
• Rocky ridge — 1994-12-30