You basically walk aournd this group of boulders.

The rock piles began underground eons ago as a result of volcanic activity. Magma—in this case a molten form of the rock called monzogranite—rose from deep within the Earth. As it rose, it intruded the overlying rock, the Pinto gneiss formation.

As the granite cooled and crystalized underground, cracks (joints) formed horizontally and vertically. The granite continued to uplift, where it came in contact with groundwater. Chemical weathering caused by groundwater worked on the angular granite blocks, widening cracks and rounding edges. Eventually the surface soil eroded, leaving heaps of monzogranite scattered across the land like careless piles of toy blocks.