Tag Archives: schist

The Colorado River in the Grand Canyon – the Middle Granite Gorge, Miles 127 – 130

The Middle Granite Gorge begins at 127 Mile rapid, as the first of its characteristic black schist appears. The next mile is packed full of things that you’ll want to take a close look at, most especially the fluted and … Continue reading

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The Colorado River in the Grand Canyon – Blacktail Canyon, Mile 117 – 121

We tear ourselves away from Elves Chasm and drift downstream towards Blacktail Canyon, another favorite. In Stephen Aisle, at Mile 117, the Monument Fold fault intersects the river, and brings the Tapeats Sandstone to river level. Blacktail is a slot … Continue reading

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The Colorado River in the Grand Canyon – Miles 109 to 115

109 Mile Rapid follows closely after Shinumo Rapid. Evidence of more faulting and Supergroup rocks are seen there on river right. At the end of this straight stretch is Hakatai Canyon, on river right at Mile 110.9. The Tapeats Sandstone … Continue reading

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The Colorado River in the Grand Canyon – Shinumo Amphitheater

Shinumo Amphitheater has many attractions. Numerous faults occur along the river in this area, and as is the case with faults in the Canyon generally, they expose rocks of the Grand Canyon Supergroup. In the prior post, we saw, at … Continue reading

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The Colorado River in the Grand Canyon – The Gems, Part 2

After Sapphire comes the easier Turquoise Rapid, at Mile 102.0. This mile also has an abundance of sculpted rocks. Next is Emerald, followed by a view of the black Ruby Buttress, which marks Ruby Rapid. Serpentine Rapid ends the Gems, … Continue reading

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The Colorado River in the Grand Canyon – the Gems

First, one last look at the Crystal Creek area – a photo of Scorpion Ridge in early morning storm-filtered light, taken from Upper Crystal camp. 11 photos. Alive Below Crystal! Now, a gentle float down to Tuna Creek Rapid, and … Continue reading

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The Colorado River in the Grand Canyon – Sockdolager Rapid

At Mile 79.1, “Sock” is the first Upper Granite Gorge rapid, and it’s a good one. The entire look and feel of the Canyon has now changed. Steep gullies, sharp-edged ridges and pinnacles adorn the walls of dark schist. At … Continue reading

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