Site of Late Pleistocene occupation in the Valley of Mexico, northeast of Mexico City, with skeletons of two mammoths killed with spears fitted with lancelike stone points and butchered on the spot. They have been given a possible date of 9000/8000 BC. In the same geologic layer a human skeleton was found - Tepexpan Man. There were no grave goods; it was buried face down with flexed legs and was identified as female. Fluorine analysis has confirmed the date of both skeleton types.