I believe these man made carvings were symbolic foundations for the underlying mythology of an fragmented and perpetually youthful culture that ultimately failed to survive the droughts and incursions of the Apaches into the northern Llano Estacado. The symbols are meaningful and specific: for their undetermined duration there is longevity in the turtle, anthropocentrism in the man carving, presence in the footprint and sustenance in the bison. They had metates to grind and stir their brew for their psyhconautic travels. They painted their faces in ritual and in war and probably tattooed themselves for individual distinction. There was a central power with official seals and symbols and revenue from the surrounding tribes like the Anasazi, the Woodlands cultures to the east and tribes further north into modern Nebraska. They built structures by placing sheet-shaped dolomite rocks on their sides and vertically to form footings and walls for dwelling structures, built roofs with sticks and hides, hunted bison on foot, fished for huge catfish from the freshwater tributaries, drank from fossil springs of the Ogallala, created art, traded with their neighbors, cultivated the land with beans and squash, fought their enemies and feuded with and even killed their own kind. Imagine split-level dwellings built on the high ground, these multiple family dwellings were typical in outlying villages built on top of small hilltops that offered panorama-visibility on all sides, the cultivated fields on the flood plain remained under guarded observation below.
Smoke from their campfires rose high above the plains and they understood distance, the importance of communication and they knew the surrounding world was full of enemies. Five miles upstream atop the cliffs above the river plain near Mullinaw there sits a two hundred year old Juniper with a small fire pit… directly under it. From that point you can nearly see the Canadian River bridge at US 287 and from that elevation of 300 feet above the riparian in a direct line of sight, one can send signals to within a mile of the petroglyphs. Signals travel much faster than armies can march so they were isolated from immediate danger. The quarries were safe. In the end numbers probably defeated them; numbers of Apaches from the west, numbers of inches of annual rainfall and the numbers their own population that had to be supported with a minimum of sustenance, without which they would be displaced, dispersed or defeated.