Historical clue formulations

• Covered, in a way, as a road — 2022-09-14
• Besmirched — 2016-12-31
• Besmirched — 2015-08-22
• Sealed, as a driveway — 2013-05-14
• Smeared with pitch — 2012-08-27
• Like some roofs and roads — 2010-05-30
• Blackened — 2008-01-09
• Blackened — 2006-10-03
• Repaired, as roads — 2004-07-11
• Defiled — 1997-10-19