File:Interference ripples (Dakota Sandstone, Lower Cretaceous; Dinosaur Ridge, Colorado, USA) (8278746564).jpg
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| Description |
Interference ripples in quartzose sandstones in the Cretaceous of Colorado, USA. The outcrop shown above is part of Dinosaur Ridge (a section of the Dakota Hogback), which is a north-south trending ridge of eastward-dipping Mesozoic sedimentary rocks. Triassic, Jurassic, and Cretaceous rocks are present, tilted by Laramide Orogeny uplift during the Cenozoic (the Front Range of the Colorado Rocky Mountains is immediately west of here). This exposure consists of structurally tilted beds of the Dakota Sandstone, a Lower Cretaceous succession of nearshore terrestrial to intertidal to shallow marine quartz sandstone deposits. Dinosaur tracks are common on some Dakota Sandstone bedding planes in this area. The ridges shown above are interference ripples on a shallow marine sandstone bedding plane. Interference ripples have two sets of symmetrical ripple marks intersecting at high angles. They form by the influence of two sets of 2-directional (oscillatory) currents. Symmetrical ripple marks only form in shallow water settings where back-and-forth wave action influences seafloor sediments. Stratigraphy: Dakota Sandstone, Albian Stage, upper Lower Cretaceous Locality: eastern side of Dinosaur Ridge, between Interstate 70 and the town of Morrison, west of Denver, north-central Colorado, USA |
| Date | |
| Source | Interference ripples (Dakota Sandstone, Lower Cretaceous; Dinosaur Ridge, Colorado, 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@N05/8278746564 (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 | 09:05, 1 December 2019 | | 960 × 460 (386 KB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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