In this park the sonoran desert transitions to the mojave. Major difference is saguaro cactus in the first and jozhua trees in the second. Driving from Tucson you can see the gradual change. First mostly gravelly sand and very sparse vegetation. Then finer sand with more vegetation especially creosote bushes. Drove through the park this afternoon. Will take a closer look tomorrow. I have become fascinated with the desert. So different from anything I have experienced. Here are some other new things - warnings for limited visibility due to blowing dust and do not enter when flooded. The Colorado River had plenty of water and the Rio Grande just a trickle. All others are bone dry. Some of these dry river or stream beds are called washes and people use they as walking paths. It is really dry here.
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