Douglas Harper's Etymology Dictionary
Usage examples of "rock-face".
I had time to notice through my bedazzlement, as I sipped, only that other such doors were visible in patches of yellow glare at various heights on the rock-face, and that a double row of bluish floodlights on tall poles, with a thick white pipe between, stretched out over flat ground to leftwards -- a brilliant line straight to the horizon.
The passage twisted like a maimed serpent, and then abruptly debouched into a sweeping valley of lush green, bisected by a tinkling stream that spilled from the rock-face near where Bazo stood.