The Oasis of Mara is currently located in a very strange spot. It's at the East end of Twentynine Palms, outside of the park, kind of right across the street from a residential neighborhood. It's also completely flat!
Then you go to 49 Palms Canyon, for example, and hike the mile and a half down into the canyon to find the clever spring right at the lowest point. It's such a clearly strategic location: you're protected from invaders, should that be a concern, the water from rains would flow and pool there, and the Indigenous peoples chose to plant their fan palms and various other things right there, where the water would run.
I seriously doubt that those same people said "oh yeah, okay, that worked well, let's go to this totally flat spot five miles away where the water doesn't really go and just plant trees and see what happens".
And if you look at the 1938 map, they didn't. There were mountains there. What is left of the Oasis is basically a sham: the Park Service has kept it alive, kind of, and acts like this is exactly how it was -- we just put some houses nearby, no biggie.
But that's a lie, and it's an egregious and harmful lie! But what value would there be in pretending less damage was done? That those houses in that neighborhood simply do not belong there, that the highway interrupts water flow that fed fertile land for at least tens of thousands of years?
Yes this was a sea millions upon millions of years ago (according to geologists, assuming they're right). Yes if you drill deep enough you get saltwater -- that's the case *everywhere*, pockets of saltwater exist underground *everywhere* and it really doesn't prove anything. The bottom of the sea is not flat, anyway! These mountains may well be as old as an ancient sea, that doesn't mean the miners didn't cut down a significant amount of our mountain range and destroy literally everything that was growing here.
Because when we act like it's "natural" for trees to be so sparse, like Joshua Trees just "naturally" don't belong at my elevation (they do), like the only biodiversity here is hiding in the soil crusts that are conveniently just "naturally" so fucking delicate, we perpetuate a lie: that the world exists in the image of corporations run by settlers who came here to get their piece and nothing else.
What does the 1938 map show? Mines and ranches.
This is not a desert. Not a "natural" one, anyway.