 In 2007 a series of houses and terraces were excavated, revealing the form of life of the inhabitants of Calixtlahuaca for the first time.It is believed that the initial settlers of this region were nomadic natives who used to visit seasonally.Lázaro Manuel Muñoz (over 200 years ago), stated that the Matlatzincas, or their nomad ancestors, visited this site at least 640 BCE (a theory appears consistent with Lorenzo Boturini) and that Otomi hunter-gatherer groups were present 3,000 years ago at the now dried up lake, which was fed by melting water from Nevado de Toluca.