I understand your ideas concerning the creosote bushes but I do not feel that's an adequate explanation for all the circular features. Creosote bushes cover most of the desert areas so why don't we see the circles everywhere?

Here are a few images of creosote bushes in California from USGS Terraserver 1meter images. I've searched the entire area near the Mojave Desert and I've found no defined circular areas. The creosote bush covers most of this area:


This image shows the bushes with a few mounds, but none of them seem to be well defined or larger than approximately 20 feet.


How can bushes form double rings? The image below shows the double ring circles near Area 51 and they are approximately 60 feet in diameter. Many appear to be buried and a few can be seen easily:


The circular features in the Modoc National Forest area of California also have double rings:


It was a theory of mine that the circular features could have been part of some type of irrigation/agricultural technique. I did not say they were part of an irrigation technique but may have been.

Thanks again for your info, it is interesting but some of the circles still appear very anomalous to me and I have been looking at satellite imagery for a few years now. However, I will look at all sides before coming to any type of conclusion...