The U.S. Forest Service brochure on Palatki states:

Palatki and its sister site of Honanki at Loy Butte are the two largest cliff dwellings in the Sedona Red Rocks area. Honanki represents one of the largest population centers in the Verde Valley; this period in Southern Sinagua prehistory is called the "Honanki Phase" and is named after this impressive cliff dwelling. Many of the cliff dwellings in the Red Rock/Secret Mountain Wilderness area were occupied during the "Honanki Phase". The actual occupation of Honanki was probably between AD 1130-1280, based upon a tree-ring date of 1271, for a wooden window lintel in the upper ruin, as well as pottery shards. Palatki habitation is dated as AD 1100-1300ÖThe pictographs you see here have not yet been scientifically studied. What little we know about them suggests they were created over a long period of time and include several design styles. The earliest may date to the Archaic period (3000-8000 years ago), before the cliff dwellings were constructed.
Ancient Sanskrit Pictograph near Sedona // ViewZone