File:Differentially cemented & eroded sandstone (member C, Uinta Formation, Eocene; Fantasy Canyon, Utah, USA) 49 (24844490785).jpg

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Differentially cemented & eroded sandstone in the Eocene of Fantasy Canyon, Utah, USA.

Fantasy Canyon has the most spectacular examples of differential weathering and differential erosion I've ever seen. The rocks are quartzose sandstones that were deposited on the eastern shore of ancient Lake Uinta, which existed during the Eocene. Some wisps and ribbons of dark-colored, magnetite-rich sand are present in the sandstone. The variety of chaotic rockforms at Fantasy Canyon are quite diverse - these cannot be explained by ordinary weathering and erosion. Close examination shows that erosion has acted upon differentially cemented sandstone. The sandstone has not undergone complete lithification and diagenesis - groundwater lobes have preferentially cemented portions of the sandstone, especially immediately adjacent to joint planes. The poorly-cemented sandstone was easily eroded & the better-cemented sandstone remains.

Stratigraphy: member C, Uinta Formation, Eocene

Locality: Fantasy Canyon, between Red Wash & Coyote Wash, Chapita Wells Gas Field, west-northwest of the town of Bonanza & south-southeast of the town of Vernal & east of the town of Ouray, northeastern Utah, USA
Date Taken on 10 June 2012, 13:04
Source Differentially cemented & eroded sandstone (member C, Uinta Formation, Eocene; Fantasy Canyon, Utah, USA) 49
Author James St. John

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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/24844490785 (archive). It was reviewed on 6 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

6 December 2019

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current02:02, 6 December 2019Thumbnail for version as of 02:02, 6 December 20194,000 × 3,000 (4.02 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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