It's hard to envision now, but this arid land was once very different. Between 358 and 323 million years ago, it was part of a vast ocean. Much of the
Can you see the white line that seems to extend from the bill of my cap? That's the gypsum sands at White Sands National Monument.
A sign at Oliver Lee State Park, which is not far south of this trail, explains that these depressions weren't originally used for collecting water. Instead, they mark places where Indians ground up nuts and grains ground up. They are more like mortars than wells.