…of the Tisselli plateau, there's every reason to think that this strategy would work. It's a windswept sandstone escarpment. And Henri Flot, who did the preliminary exploration out there, said that in these arroyos where the sand has been cleared away by…

…evidence would be these rock paintings in southern Algeria in what's called the Tsile plateau, the Hogar and Azure region of Algeria. Henri Flot wrote a book called the rock paintings of Tassili and you can see them in there. Part of the problem, which…