Two mammoth kill-sites in southeast Chiapas, Mexico, with human occupation dating to 9250 years ago. At one site, a skeleton was found scrapers, knives, and blades of flint and obsidian, as well as a stemmed projectile point of flint. The second mammoth site yielded a chert knife, a leaf-shaped point of flint, and a lanceolate point with a flat base. Similar kill sites were found at San Bartolo Atepehuacan, on the outskirts of Mexico City and at Tepexpan. The site is important as an indicator of the rapidity with which newly arrived (Asian) hunters dispersed southward. Stone tools of both the Big Game Hunting Tradition and the Old Cordilleran Tradition were found in the same levels, which is puzzling and infers a combination of hunting techniques were used.