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First Mummies May Have Been Inspired by Field of Corpses
sciencehabit writes with a story about a field strewn with corpses in shallow graves. From the article: "Trekking through Chile's Atacama Desert 7000 years ago, hunter-gatherers known as the Chinchorro walked in the land of the dead. Thousands of shallowly buried human bodies littered the earth, their leathery corpses pockmarking the desolate surroundings. According to new research, the scene inspired the Chinchorro to begin mummifying their dead, a practice they adopted roughly 3000 years before the Egyptians embraced it."
The easiest explanation for the other bit is that the bodies came back "up" due to wind erosion, which the Atacama, like many deserts, would probably have more than enough of to go around.
Quo usque tandem abutere, Nimbus, patientia nostra?
I lived in the Atacama dessert for a couple of years so I can attest to the oasis concept, at least in part. For the most part I lived in cities and didn't know where I got my water, although I know there is one main river that makes it down to Antofagasta (the Loa river). But one time I took a trip a few hours inland. Now, keep in mind, the Atacama dessert (apart from the cities) isn't like your Mojave or anything like that, with tumbleweeds and Joshua trees and cacti. It's more like the surface of the moon (in fact there is a "valle de la luna"). Between cities there is nothing but dirt.
At any rate, we eventually arrived at any incredible oasis. A nice stream flowing in a small valley, or more like a tunnel or crevice. I don't know if they were planted but there were tons of fruit trees (membrillo). Lots of lush vegetation. It was truly amazing, like something out of a movie, except you didn't see it until you were there because it was down below the surface.