File:Chert (Morrison Formation, Upper Jurassic; Dinosaur National Monument, Utah, USA) 1 (48829093478).jpg

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Chert in the Jurassic of Utah, USA.

The Upper Jurassic Morrison Formation is widely distributed in many western American states. The unit consists of fluvial (river/floodplain) and lacustrine (lake) deposits. Dinosaur bones and dinosaur tracks are moderately common in Morrison Formation sediments. Exceptionally dinosaur-rich localities include Como Bluff in Wyoming, Dinosaur National Monument in Utah, Dinosaur Ridge in Colorado, and the Cleveland-Lloyd Quarry in Utah.

Lithologically, the Morrison is dominated by mixed siliciclastics, but other rock types are present. The photo shows a chert mass in the Morrison at Dinosaur National Monument, Utah. Chert is a cryptocrystalline, quartzose sedimentary rock. It is hard, can be any color, breaks with a conchoidal fracture, and has sharp broken edges. A synonym of chert is "flint".

Stratigraphy: Morrison Formation, Kimmeridgian Stage, middle Upper Jurassic, ~150 to 156 Ma

Locality: Fossil Discovery Trail, Dinosaur National Monument, northern Uintah County, northeastern Utah, USA

See info. at: <a href="https://en.wikipedia.org/wiki/Dinosaur_National_Monument" rel="noreferrer nofollow">en.wikipedia.org/wiki/Dinosaur_National_Monument</a>

Geologic map of Dinosaur National Monument:

<a href="https://pubs.usgs.gov/imap/1407/plate-1.pdf" rel="noreferrer nofollow">pubs.usgs.gov/imap/1407/plate-1.pdf</a>
Date Taken on 10 June 2013, 14:12
Source Chert (Morrison Formation, Upper Jurassic; Dinosaur National Monument, Utah, USA) 1
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@N05/48829093478 (archive). 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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current00:46, 8 October 2019Thumbnail for version as of 00:46, 8 October 20194,288 × 2,848 (9.26 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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