File:Grand Canyon National Park, Bright Angel Trail 0300 (8001059576).jpg

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Detail of the brightly colored Bright Angel formation NPS Photo by: Kristen M. Caldon


Thickness: 350-500 ft.

Forming the expansive slope over which the Tonto Trail traverses, the Bright Angel Formation is a distinct green layer of shale and sandstone.

This formation was deposited as the sea level rose about 515 million years ago during the early to middle Cambrian period.

As the sea covered the beach-like environment of the Tapeats, the water deepened enough that the sediments on the ocean floor were no longer disturbed by waves.

The rocks of the Bright Angel Formation gain their characteristic green color from a mineral called glauconite, which forms in shallow marine environments that are mildly reducing when little or no sedimentation is taking place.

Fossils of brachiopods, trilobites and hyoliths are found in the Bright Angel Formation.
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Source Grand Canyon National Park, Bright Angel Trail_0300
Author Grand Canyon National Park

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This image was originally posted to Flickr by Grand Canyon NPS at https://flickr.com/photos/50693818@N08/8001059576. It was reviewed on 21 November 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

21 November 2020

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current21:07, 21 November 2020Thumbnail for version as of 21:07, 21 November 20203,514 × 1,770 (3.5 MB)Tm (talk | contribs)Transferred from Flickr via #flickr2commons

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