Looting Leads Archaeologists to Oldest Known Mayan Calendar

"Looters have extensively targeted Xultún, which was once a sprawling Maya city-state. But in March 2010, a member of Saturno's team, Boston University student Maxwell Chamberlain, discovered part of a painted wall exposed by the illicit diggers. Subsequent archaeological excavation revealed three intact room walls within a residential compound: the walls bore paintings of human figures—including an elaborately attired Maya king—as well as vertical columns of numbers written in Maya hieroglyphs."