How interesting Michael! I am trying to place this, but from my travel's in New Mexico, I have found there are such cool rock structures scattered all across the state.
Awesome job with the Milky Way and with the lighting of the ground. I like the very natural feel to this. My favorite of these though may be #1, with #5 being a close 2nd. I really like the composition, I like the soft light that brings out such cool little details in the rock itself.