The granite rocks of the Deccan Plateau are amongst the oldest in the world.

Geologists date these rocks 2,500 million years back. That is the time when the earth's crust solidified. Molten magma then pushed upwards from the interior and hardened under the crust into domes and sheets of granite. Horizontal and vertical cracks developed. When, slowly, the top layers of the crust eroded, and these very hard granites were exposed, they weathered over millions of years into their present forms. This happened along their horizontal and vertical cracks during - what is called - onion peel weathering (or spheroidal weathering), rounding the stones - and the bizarre formations resulted.