Mexico: Maya tomb find could help explain collapse

Archaeologist Juan Yadeun said the tomb, and ceramics from another culture found in it, may reveal who occupied the Maya 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 A.D. 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 A.D. 840 and 900.
"It is clear that this is a new wave of occupation, the people who built this grave of the Toltec type," Yadeun said Wednesday. "This is very interesting, because we are going to see from the bones who these people are, after the Maya empire."   link