The Lower Sonoran is hard to believe in its climatic extremes, and yeah, it really is dangerous and shouldn't be taken lightly. Having enough water will get you through most things safely, but it's hard to appreciate just how much "enough" means on a day like that.
As it happens, I was just going through scans from this trip when you guys zombified this thread. What the heck---here are a couple more quick-and-dirty neg scans (from the Rolleiflex, on Efke 25 at 50, developed in HC-110). Obviously they're unspotted---in the case of the dunescape, I kind of like the effect.