 The enormous size of the site, the depth of their deposits and the lack of financial resources hampered extensive excavations.However, because of the sedimentation type and climatic conditions in the area, the archaeological ovens, retained coal content inside up till today.From excavations 20 oven samples were obtained at various depths, which were carbon 14 dated from 6,960 BC., up to 1,760 AD; this long chronology is an extended sequence of 8,000 years of native cultural development in the northeast region of Mexico.