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Grand Canyon of the Yellowstone River (Yellowstone, Wyoming, USA) 174

Grand Canyon of the Yellowstone River (Yellowstone, Wyoming, USA) 174

The most colorful and visually spectacular valley in Yellowstone, Wyoming is the Grand Canyon of the Yellowstone. Two large waterfalls occur along this stretch of the river - the Upper Falls and the Lower Falls.

The rocks of the canyon include rhyolite lava flows, rhyolitic volcanic tuffs, and some sedimentary deposits - all are geologically young and date to the Quaternary.

The yellows, pinks, reds, and oranges indicate the presence of hydrothermally altered rocks. Hydrothermal metamorphism refers to the intense alteration by superheated groundwater. Yellowstone has over 100,000 hydrothermal features in the form of hot springs, geysers, fumaroles, and mudpots.

Locality: view from Artists Point, southern rim of the Grand Canyon of the Yellowstone, northwestern Wyoming

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Photo taken on 13 August 2010 (© James St. John / Flickr)

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 grand, canyon, yellowstone, river, hydrothermal, alteration, altered, metamorphism, rhyolite, valley, valleys, rivers, wyoming
 

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