A group of construction workers stumbled upon 46 ancient tombs, between 1,500 and 2,500 years old while digging to build a new soccer stadium in Deportivo Cali in southwestern Colombia, an archaeologist team said on Wednesday.
The tombs were found in Malagana, on the basin of the Cauca River. Anthropologist Jose Rodriguez, who headed a team from Colombia's National University, said that the tombs showed evidence of cannibalism and warrior activities.
There's nothing really in the article about how they determined any of this stuff. Except for a bit about a female "shaman".