File:Concretionary cone-in-cone structures (Benton Shale, Upper Cretaceous; Red Rock Canyon Open Space, Colorado Springs, Colorado, USA) 1.jpg
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[edit]DescriptionConcretionary cone-in-cone structures (Benton Shale, Upper Cretaceous; Red Rock Canyon Open Space, Colorado Springs, Colorado, USA) 1.jpg |
English: Concretionary cone-in-cone structures in the Cretaceous of Colorado, USA. (cross-section view)
Cone-in-cone structures are strange features found as interbeds in fine-grained siliciclastic rocks or in the outer layers of concretions. They consist of sets of conical structures stacked up within each other. Mineralogically, they are often composed of finely-crystalline fibrous calcite. Numerous hypotheses have been proposed over the years that try to explain cone-in-cone structures. None has emerged as the most popular or most likely (see Lugli et al., 2005 for a long list of proposed formation mechanisms). These structures remain a mystery. Stratigraphy: concretion in lower Benton Shale, Upper Cretaceous Locality: slope exposure along the Lower Hogback Trail, Red Rock Canyon Open Space, western side of the town of Colorado Springs, western El Paso County, central Colorado, USA (vicinity of 38° 50’ 59.79” North latitude, 104° 52’ 30.08” West longitude) For more info. on cone-in-cone structures, see (as examples): Melichar & Shkovira (2001) - Case study of the cone-in-cone structure based on Czech and Crimean samples. GeoLines 13. Lugli et al. (2005) - Silicified cone-in-cone structures from Erfoud (Morocco): a comparison with impact-generated shatter cones. in Impact tectonics. Impact Studies 6: 81-110. |
Date | |
Source | https://www.flickr.com/photos/47445767@N05/49284534842/ |
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@N05/49284534842 (archive). It was reviewed on 29 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
29 December 2019
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current | 02:17, 29 December 2019 | ![]() | 3,008 × 1,813 (3.99 MB) | Ser Amantio di Nicolao (talk | contribs) | User created page with UploadWizard |
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Date and time of data generation | 15:14, 29 October 2010 |
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File change date and time | 19:24, 27 December 2019 |
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Exif version | 2.21 |
Date and time of digitizing | 15:14, 29 October 2010 |
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File source | Digital still camera |
Scene type | A directly photographed image |
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Date metadata was last modified | 14:24, 27 December 2019 |
Unique ID of original document | 70A21D13ECC4DF1A5BE985C9821C8202 |