 1 Archaeologists work has achieved differentiating over 25 plant species in the region, now extinct, evidence that the zone was different and friendlier to humans.The site had some importance at the end of the 18th century as a sugar cane producer; it also had some relevance during the 1910 Mexican Revolution, but after the introduction of cattle to the zone and government efforts to send water from state water wells to the city of Monterrey, the site is more arid than ever before.The presence of hundreds of pre-Hispanic ovens or furnace stoves, the infinity of stone tools and thousands of rock engraved images commonly known as petroglyphs, evidence the lengthy and important socio economical and ritual development of native groups that exploited and maintained an environmental equilibrium in the region up to the Spaniards' arrival.