As far as we know the Paintings have never been professionally studied.
We have had numerous conversations and picture evaluations with Sul Russ University, Alpine Texas. It is suspected the site was used in several time periods. The older thicker designs could have been from the Coahuiltecan Indians. The Coahuiltecan population in 1620 was estimated to be around 100,000. The later thinner lines and engravings could have been from the Apache Indians around 1720 as ran the Coahuiltecan to the Spanish Missions.