The Kumeyaay and their ancestors have lived on the Baja-California border at least 10,000 years in accordance with a recent excavation near Jacumba. Their descendants are probably the Yuman speaking Tipai. The striking red, black and white pictographs were painted in caves and on rocks along the southern California border, up the Gila River and along the Colorado River, ranging from the lower Grand Canyon to the Sea of Cortez. This tradition of ancient art is called La Rumorosa, after a site in northeastern Baja, Mexico.
Learn more at La Rumorosa Rock Art.com