THESE ARE THE LARGE MEGALITHIC STONES found in Gornaya Shoria, in Southern Siberia, Russia. This is not a "Mountain side", it is a cut and polished stone created to build a wall with. It is cut as a flat surface, right angles and sharp corners. Obviously an engineered artifact. The one in this picture is part of a wall where some of the the stones are 3,000 Metric Tons. The next question you should be asking is: "How could the people in the distant past cut these stones, polish them, transport them over 20 miles up a mountain side, lift them 40 feet in the air and place them in a stone wall.
Get back to me on this. I like to know.