Here is the big question. How did these large sandstone boulders get on top of this section of slick rock? I guess you might speculate that these particular boulders just happen to be slightly more resistant to erosion than the huge expanse of slick rock but that just raises another series of questions as to why the slick rock erodes to an almost level surface. If you are walking on this sandstone, it is not really "slick." It is actually quite rough and easy to walk on. It might be slick in wet weather or if it were covered in ice, but that begs the issue.
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