wilderness wrote:
Just down a few feet (it's filled with water), it's a type of pothole called a weathering pit. Caused, they think, by wind erosion. If you've ever seen (or heard of) The Cosmic Ashtray that's a much larger much easier to access weathering pit.
Near west Texas, they call them huecos, and we go to a place to climb called Huecos Tanks. The holes are important natural features for the desert life there, as the retain water when it does rain. This area you have been hiking is beautiful. Thanks for sharing with us!