File:Cross bedding in structurally tilted quartzose sandstones (Dakota Sandstone, Lower Cretaceous; crest of Dinosaur Ridge (Dakota Hogback), west of Denver, Colorado, USA) (15044046741).jpg
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| Description |
Cross bedding in structurally tilted quartzose sandstones of the Dakota Group (Albian Stage, upper Lower Cretaceous) at Dinosaur Ridge, west of Denver, Colorado, USA. Cross beds and cross laminations (a.k.a. cross stratification) are tilted sedimentary layers between horizontal layers. They form in one-directional currents by wind or water. Many names for different types of cross stratification are available, depending on the specific geometry of the sedimentary structure. These include angular cross bedding, tabular cross bedding (planar cross bedding), tangential cross bedding, trough cross bedding (festoon cross bedding), herringbone cross bedding, hummocky cross bedding, swaley cross bedding, climbing ripples cross bedding (ripple cross bedding), contorted cross bedding, overturned cross bedding (recumbently folded cross bedding; prolapsed cross bedding), etc. |
| Date | |
| Source | Cross bedding in structurally tilted quartzose sandstones (Dakota Sandstone, Lower Cretaceous; crest of Dinosaur Ridge (Dakota Hogback), west of Denver, Colorado, USA) |
| 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@N05/15044046741 (archive). It was reviewed on 1 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 09:06, 1 December 2019 | | 3,008 × 2,000 (3.61 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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