File:Rippled sandstone (Frontier Sandstone, Upper Cretaceous; western Dinosaur National Monument, Utah, USA) (48849724972).jpg
![File:Rippled sandstone (Frontier Sandstone, Upper Cretaceous; western Dinosaur National Monument, Utah, USA) (48849724972).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/8/80/Rippled_sandstone_%28Frontier_Sandstone%2C_Upper_Cretaceous%3B_western_Dinosaur_National_Monument%2C_Utah%2C_USA%29_%2848849724972%29.jpg/800px-Rippled_sandstone_%28Frontier_Sandstone%2C_Upper_Cretaceous%3B_western_Dinosaur_National_Monument%2C_Utah%2C_USA%29_%2848849724972%29.jpg?20191008005433)
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Summary
[edit]DescriptionRippled sandstone (Frontier Sandstone, Upper Cretaceous; western Dinosaur National Monument, Utah, USA) (48849724972).jpg |
Structually tilted sandstone with ripple marks in the Cretaceous of Utah, USA. This is an outcrop of the Frontier Sandstone (Frontier Formation). The rocks in this area have been tectonically tilted - the beds are steeply dipping to the south. The Upper Cretaceous Frontier Sandstone is a coarse-grained, shallow water marine to shoreline unit. Marine deposits of Cretaceous age are widespread in western North America - they represent sedimentation during a sea level highstand. At this time, global sea level became so high that an ocean called the Western Interior Seaway separated eastern and western North America. The Cretaceous transgression was a result of relatively rapid seafloor spreading rates (tectonic divergence) in some oceans basins. This lifted considerable portions of the seafloor, which raised global sea levels. Ripple marks are a common type of sedimentary structure - they form in a current. Asymmetrical ripple marks have a long side and a short side, when viewed in cross-section - they form in a one-directional current by wind or water. Symmetrical ripple marks are more or less evenly shaped and form in a two-direction (back-and-forth) current in very shallow water by wave action. These examples appear to be symmetrical ripple marks, which is consistent with the Frontier Sandstone's depositional environment. Stratigraphy: Frontier Sandstone, Upper Cretaceous Locality: Fossil Discovery Trail, western Dinosaur National Monument, northern Uintah County, northeastern Utah, USA (vicinity of 40° 26' 16.81" North latitude, 109° 17' 59.46 West longitude) 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 | |
Source | Rippled sandstone (Frontier Sandstone, Upper Cretaceous; western Dinosaur National Monument, Utah, USA) |
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@N05/48849724972 (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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current | 00:54, 8 October 2019 | ![]() | 4,288 × 2,848 (9.88 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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File change date and time | 18:32, 5 October 2019 |
Y and C positioning | Co-sited |
Exposure Program | Not defined |
Exif version | 2.21 |
Date and time of digitizing | 20:15, 9 June 2013 |
Meaning of each component |
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Maximum land aperture | 5.3 APEX (f/6.28) |
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Scene type | A directly photographed image |
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White balance | Auto white balance |
Digital zoom ratio | 1 |
Focal length in 35 mm film | 277 mm |
Scene capture type | Standard |
Scene control | None |
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Date metadata was last modified | 14:32, 5 October 2019 |
Unique ID of original document | F9C11EB3B1E16324BF214C171C52938F |