File:Cone-in-cone limestone (likely an interbed from the Ohio Shale, Upper Devonian; Alum Creek Lake area, Delaware County, Ohio, USA) 3.jpg
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English: Cone-in-cone limestone from the Devonian of Ohio. (cross-section view; weathered surface)
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: likely derived from an interbed in the Ohio Shale, Upper Devonian Locality: near Alum Creek Lake, Delaware County, Ohio, USA Example references on cone-in-cone structures: 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@N05/50474391121/ |
| 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@N05/50474391121. It was reviewed on 14 October 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| current | 05:52, 14 October 2020 | | 3,947 × 738 (2.02 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/50474391121/ with UploadWizard |
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