The big surprise for me was the schist. Schist is metamorphic rock that appears in the deepest and oldest layers in the canyon. It is hard rock (as opposed to the limestone above) and the river sculpts it into fantastic, flowing shapes that look like modern sculpture. Schist comes in multiple colors -- black, pink, lavender, grey -- and shines as though it ought to be glassy-smooth, which it is not when you touch it.
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Schist
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