File:Grand Canyon of the Yellowstone River (Yellowstone, Wyoming, USA) 121 (47682840051).jpg

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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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Source Grand Canyon of the Yellowstone River (Yellowstone, Wyoming, USA) 121
Author James St. John

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This file is licensed under the Creative Commons Attribution 2.0 Generic license.
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/47682840051 (archive). It was reviewed on 10 October 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

10 October 2019

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Date/TimeThumbnailDimensionsUserComment
current01:57, 10 October 2019Thumbnail for version as of 01:57, 10 October 20193,968 × 2,976 (4.72 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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