File:Cone-in-cone limestone bed (interbed in the Ohio Shale, Upper Devonian; Glen Echo Ravine, Columbus, central Ohio, USA) (15141452615).jpg
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Cone-in-cone limestone bed from the Devonian of Ohio, USA. (2.3 centimeters across at its widest) Cone-in-cone structures are strange features found as interbeds in fine-grained siliciclastic rocks and sometimes found 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: interbed in the Ohio Shale, Upper Devonian Locality: Glen Echo Ravine, Columbus, central Ohio, USA 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 | Cone-in-cone limestone bed (interbed in the Ohio Shale, Upper Devonian; Glen Echo Ravine, Columbus, central Ohio, 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@N05/15141452615 (archive). It was reviewed on 7 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| current | 18:53, 7 December 2019 | | 857 × 778 (794 KB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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