This area got it's name because of how rough the surface is, as almost everything is covered in large halite salt crystals. The area was once covered with Lake Manly which is now gone, and left behind the minerals that were dissolved in the water. This area is several feet above surrounding areas therefor it remains dry allowing weathering to sculpt the salt crystals into complicated formations. I think the two most important things when making a map of here would be what the rocks are underneath the layer of salt crystals are and if the salt crystals differentiate from other salt crystals around the valley. As you can see in the image below, the surface is very rough and it's hard to tell what is salt crystal and what is rock.
© Lucas G via https://en.wikipedia.org/wiki/Places_of_interest_in_the_Death_Valley_area
References : https://en.wikipedia.org/wiki/Places_of_interest_in_the_Death_Valley_area
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