Walked to the Canyon rim, first view from there this trip and as always, a shocking sight; besides the unique beauty it invariably takes me into deep time: six million years to carve the Canyon and the side canyons, formations, and myriad astonishing features, a long process of uplift and erosion and now close to a mile deep. Only a blip in the Earth’s unbelievable history but unimaginably long for most of us. I’m sure that the indigenes looked at the canyon and saw an autograph of the Great Mystery while the colonizing Spaniards and subsequent Euro-Americans saw an obstacle, at least until John Wesley Powell took it seriously enough to...

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