yes the rest area is showing the brine mud, which by the way is different than MUD, the salt flats have other things besides salt which during the Winter or the wet months desolves and goes into the brine mud, which when the summer temps raise so too does the salt surface, its been that way for a really long time, I know this, because, yes to repeat, I live here and see it every day, and have for 54 years!!!! Not just once or twice a year, 52 weeks, 365 days a year.