 Their erstwhile inhabitants belonged to several indigenous American cultures that are believed to have occupied the Verde Valley between 700 and 1425 CE, the foremost of which being a cultural group archaeologists have termed the Southern Sinagua.The earliest of the ruins located on the property (with the exception of the irrigation canal), a "pithouse" in the traditional Hohokam style, dates to about 1050 CE.More than 50 countable "rooms" are found inside the park boundaries; it is likely that some were used for purposes other than living space, including food storage and religious ceremonies.