Fact is they do not really know much about the peoples of the area from that time.
Here is a links that my help. Hovenweep National Monument - History & Culture (U.S. National Park Service)
The image above is the Cajon group ruins, outlier of the Hoveneep National Monument. These images are the same ruins in winter.
Just the other side of the Utah-Colorado border in Colorado.
The Painted Hand Ruins so called for the painted hand prints left behind by the original inhabitants.