
A ceramic head found in a newly discovered tomb sits on display at the Mayan Tonina archeological site near Ocosingo village in Mexico's Chiapas state.- Miguel Tovar
Archeologist Juan Yadeun said the tomb, and ceramics from another culture found in it, may reveal who occupied the Mayan site of Tonina in southern Chiapas state after the culture's classic period began fading.
Many experts have pointed to internal warfare between Mayan city states, or environmental degradation, as possible causes of the Maya's downfall starting around AD 820.
But Yadeun, who oversees the Tonina site for Mexico's National Institute of Anthropology and History, said artifacts from the Toltec culture found in the tomb may point to another explanation. He said the tomb dates to between the years 840 and 900.












