Some of the larger holes have scorch marks inside from old campfires. One of the smaller holes has a Creosote bush growing like a potted plant.

We accidentally found this place while 4-wheeling near Tapado Canyon, 30 years ago.
It isn't on any State Park maps, but that isn't surprising. There are many sensitive sites - geologic and anthropologic in Big Bend Ranch
which are held in secret for preservation reasons.