Then, complex natural stone structures started to show up approximately the year 850 AD, whereas before the Indians lived in below ground pit houses. Chaco National Park is the destination at present where the archeology sites of the Great Houses are accessible. Construction measures new to this area were made possible the building of these great properties. Kivas were a central aspect of The buildings described as Great Houses, these spherical, buried sites were likely put into use for ceremonial purposes. A successful society were there for approx 300 years, until eventually unknown changes or instances induced the residents to disperse. Mass migration out of the canyon may have been induced by a shortage of regular rain fall, transformations in weather conditions, or concerns with the community. 1150AD in Chaco Culture National Monument may very well be believed to be the peak of Chacoan civilization.
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