 Stone Age implements have been found all over the territory from mammoth bones, to stone tools to human remains.Most have been found in the areas of Los Reyes Acozac, Tizayuca, Tepexpan, San Francisco Mazapa, El Risco and Tequixquiac.Between 20,000 and 5000 BCE, the people here eventually went from hunting and gathering to sedimentary villages with farming and domesticated animals.