Tag Archives: bass limestone

The Colorado River in the Grand Canyon – Tapeats Creek, Mile 133.7

Tapeats Creek! It’s a crystal-clear trout stream fed by springs that issue from below the North Rim, one of which is the spectacular Thunder River Spring which shoots out of a cave in a limestone cliff. The diabase mentioned above … Continue reading

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The Colorado River in the Grand Canyon – Deubendorff Rapid and Stone Creek, Mile 131

March, 2007. We arrived at Bedrock Rapid on a cold and rainy day. Unintentionally, of course, three of our rafts went left. One made it, one flipped and one was maneuvered out of the river left eddy with ropes from … 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 – entering the Upper Granite Gorge

The Upper Granite Gorge begins where the run through Hance and Son of Hance rapids ends, at Mile 77.9.  The main rock type of the Upper Granite Gorge (and the other two Granite Gorges) is Vishnu Schist, a hard metamorphic … Continue reading

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