File:Chert nodule in limestone (Columbus Limestone, Middle Devonian; Ohio Caverns, western Ohio, USA) 10 (30817663336).jpg
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[edit]DescriptionChert nodule in limestone (Columbus Limestone, Middle Devonian; Ohio Caverns, western Ohio, USA) 10 (30817663336).jpg |
Ohio Caverns is the largest cave system in Ohio. It is located in a bedrock knob called Mt. Tabor on the southern side of the Bellefontaine Outlier (= Ohio's elevationally highest area). The cave is hosted in the Middle Devonian Columbus Limestone, which is part of a widespread shallow marine carbonate succession in eastern and midwestern America. In the above photo, the elongated nodule projecting from the limestone wall is chert, a cryptocrystalline quartzose sedimentary rock. This chert nodule is a diagenetic chert mass, formed by dissolution and remobilization of silica after burial. Visible marine fossils such as rugose corals and brachiopods are present in some of these nodules (= chertified limestone). The various colors are due to iron oxide staining. Locality: Ohio Caverns, Mt. Tabor, east of the town of West Liberty, northern margin of Champaign County, western Ohio, USA For a recent technical article on the geology of Ohio Caverns, see: <a href="http://scholarcommons.usf.edu/ijs/vol45/iss1/7/" rel="nofollow">scholarcommons.usf.edu/ijs/vol45/iss1/7/</a> |
Date | |
Source | Chert nodule in limestone (Columbus Limestone, Middle Devonian; Ohio Caverns, western Ohio, USA) 10 |
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@N05/30817663336 (archive). It was reviewed on 12 October 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
12 October 2019
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current | 13:38, 12 October 2019 | 4,000 × 3,000 (3.82 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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Camera manufacturer | Canon |
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F-number | f/2.8 |
ISO speed rating | 80 |
Date and time of data generation | 09:39, 23 October 2016 |
Lens focal length | 6.2 mm |
Image title | |
Width | 4,000 px |
Height | 3,000 px |
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Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
Software used | Adobe Photoshop Elements 13.0 (Macintosh) |
File change date and time | 01:23, 8 November 2016 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 09:39, 23 October 2016 |
Meaning of each component |
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File source | Digital still camera |
Custom image processing | Normal process |
Exposure mode | Manual exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Scene capture type | Portrait |
Lens used | 6.2-18.6 mm |
Date metadata was last modified | 18:23, 7 November 2016 |
Unique ID of original document | BB4B40C4A1C3D1EE2B2C982D057D796D |