esshup, that theory is spot on. We've had plenty of research done down here, as well as anecdotal evidence, that much of our soil is deposited material from Arizona and New Mexico (the Land of Enchantment). We refer to this loess as "grains of enchantment". Over many years it has accumulated 6' deep in places.

After a Spring windstorm, the high country snow has a decided reddish cast to it. We're seeing more and more of that as the dry country to the south loses its moisture earlier in the Spring, and the windstorms increase in frequency.