Wm. Blake

The rock you stand on at the rim is 250 million years old. The Palesozoic era preceded the Mesazoic, when the dinasaurs came to be, and you are looking down through half the earth's history, to 1.8 billion year old rock. .
The Grand Canyon in mist.
The canyon itself extends 200 river miles, from Marble Canyon to Lake Mead. The canyon itself is the youngest thing here. It started forming only about 10 million years back. Only. Ten Million. But the rock it cut throuh was a bit older. The top layer, the Kaibab limestone, was laid down at the bottom of the Permian Sea 250 or so million years back.


Above the Tappeats sandstone is another Cambrian layer, the Bright Angel Shale, which, as common with soft shale, has eroded rapidly and creates the gently sloping plateau, called the Tonto Plateau, quite wide in some places.

They left camp, after hiking the 6 miles or so across the Tonto from Boucher Creek, a trek thru the Hermit Creek to the Colorado, then back up the steep, rough, Hermit Trail, about 8 more miles straight up. Heard from Jason, that they got to trail head after dark. There are some rough spots and even in daylight the trail gets hard to find. Rock slides make hard going at many points.
I did it the next morning. Left Hermit Camp about 5, made it out about noon. Snow and ice the last 500 feet, made it slow for me. Over all, the best of some 8 back-packs I have taken in the Canyon.
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