Top photo is the right (east) inselberg.
Bottom photo is the left (west) inselberg.

https://www.desertusa.com/desert-califo ... kpile.html Imagine holding an ice cube under the faucet. The cube rounds away at the corners first, because that is the part most exposed to the force of the water. A similar thing happened here but over millions of years, on a grand scale, and during a much wetter climate.

Erosional forces change the shape of the stonesAfter the arrival of the arid climate of recent times, flash floods began washing away the protective ground surface. As they were exposed, the huge, eroded boulders settled one on top of another, creating those impressive rock piles we see today.