File:Unlithified fluvial gravel (Dinosaur National Monument, Utah, USA) 3 (48791824737).jpg

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Fluvial deposits are sedimentary layers laid down in fluvial systems - rivers and streams. In the channel facies, deposits are usually poorly sorted and cross-bedded. In the ancient rock record, channel deposits are typically sandstones and conglomerates. In the floodplain facies, deposits are usually fine-grained - in other words, mud. With burial and lithification, floodplain deposits become horizontally layered shales, maybe with mudcracks and occasional plant fossils, representing growth between flood events.

Seen here is an unlithified, poorly sorted, fluvial gravel deposit in the Uinta Mountains of northeastern Utah. These sediments were deposited by the ancestral Green River.

Locality: roadcut above Split Mountain campground, Dinosaur National Monument, northeastern Utah, USA (40° 26' 36.95" North latitude, 109° 15' 15.67" West longitude)
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Source Unlithified fluvial gravel (Dinosaur National Monument, Utah, USA) 3
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@N05/48791824737. It was reviewed on 8 October 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

8 October 2019

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Date/TimeThumbnailDimensionsUserComment
current00:39, 8 October 2019Thumbnail for version as of 00:39, 8 October 20194,288 × 2,848 (9.1 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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