File:Mowry Shale over Dakota Sandstone (Cretaceous; Dinosaur National Monument, Utah, USA) 1 (48686783027).jpg

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Structurally tilted shales and sandstones in the Cretaceous of Utah, USA.

The ridge of rocks at right is an outcrop of structurally tilted Dakota Sandstone in Dinosaur National Monument, Utah. The beds are dipping to the left. This unit and its correlatives are a widespread package of sandy siliciclastics deposited in the ancient Western Interior Seaway of North America. The Dakota Sandstone dates to the late Early Cretaceous and early Late Cretaceous.

The small valley at center consists of the Mowry Shale, a mid-Cretaceous unit characterized by dark-colored siliceous shales. Upon weathering, the shale usually consists of silvery-gray chips. Fragmentary fish fossils are common in some Mowry Shale outcrops. In Wyoming and Montana, the Mowry is a significant source rock for hydrocarbons. It's been calculated that about 12 billion barrels of oil have been generated by the Mowry in the deep subsurface of those two states (see summary in Bremer, 2016).

Stratigraphy: Mowry Shale (mid-Cretaceous) over Dakota Sandstone (Lower Cretaceous)

Locality: view from access road to Carnegie Quarry, Dinosaur National Monument, northern Uintah County, northeastern Utah, USA

Reference cited:

Bremer (2016) - Stratigraphy and Sedimentology of the Cretaceous of the Cretaceous Mowry Shale in the Northern Bighorn Basin of Wyoming: Implications for Unconventional Resource Exploration and Development. M.S. thesis. University of Nebraska, Lincoln, Nebraska. 55 pp.

See info. at:

<a href="https://en.wikipedia.org/wiki/Dinosaur_National_Monument" rel="noreferrer nofollow">en.wikipedia.org/wiki/Dinosaur_National_Monument</a>
Date
Source Mowry Shale over Dakota Sandstone (Cretaceous; 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@N05/48686783027 (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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current00:34, 8 October 2019Thumbnail for version as of 00:34, 8 October 20193,999 × 2,466 (7.67 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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