Baja California Rock Art Dated to 7,500 Years Ago

The giant rock art murals that grace the walls of hundreds of shelters and caves found in the hardscrabble hills of the high sierra in Baja California Sur, Mexico, date back as far as 7,500 years ago, according to data from an ongoing study of the area.

The ancient dates for the paintings cast little light on the mystery of who made them and why, but it suggests that whoever the painters were they came well before the Aztecs established their culture in central Mexico in the 12th century A.D.