Archaeologists digging near Mexico's Sonora desert have discovered what appears to be the burial ground of an early Mesoamerican society, including signs of deformed skulls.
According to a story at Past Horizons Archaeology,
The burial ground consists of 25 individuals; 13 have intentional cranial deformation and five also have dental mutilation, cultural practices which are similar to those of pre-Hispanic groups in southern Sinaloa and northern Nayarit, but until now, have not been seen in Sonora.... Archaeologist Cristina Garcia Moreno, director of the research project...said that, "Cranial deformation in Mesoamerican cultures was used to differentiate one social group from another and for ritual purposes, while the dental mutilation in cultures such as the Nayarit was seen as a rite of passage into adolescence. This is confirmed by the findings at the Sonora cemetery where the five bodies with dental mutilation are all over 12 years in age."
The main significance to archaeologists is that the discovery suggests the presence (or influence) of Mesoamerican societies much farther north than previously believed.