File:Mudcracks in limestone (Makgol Formation, Ordovician; outcrop along the Yonchi River, Gangwon South Province, South Korea) 2.jpg
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Summary
[edit]DescriptionMudcracks in limestone (Makgol Formation, Ordovician; outcrop along the Yonchi River, Gangwon South Province, South Korea) 2.jpg |
English: Mudcracks in limestone in the Ordovician of South Korea.
Mudcracks are diagnostic sedimentary structures indicating subaerial exposure of sediment surfaces, with alternating wet & dry conditions. They are much more common that raindrop imprints, which indicate the same environmental setting. Mudcracks are most likely to occur in fine-grained siliciclastic rocks, fine-grained carbonate sediments, and in some evaporitic successions. Mudcracks are distinctive and easy to identify, but they do vary in appearance. The cracks themselves vary in width, depth, and areal density. Mudcrack polygons also vary in size & shape. The outcrop shown above has structurally-tilted Ordovician limestones representing tidal and peritidal facies. Mudcracks are present here; the rest of the outcrop has stromatolites, mudmounds, symmetrical ripples, gypsum needles, and birdseye structures. Stratigraphy: lower Makgol Formation, ~Lower Ordovician to ~Middle Ordovician Locality: riverbank exposure next to waterfalls in the Yonchi River, immediately north of river tunnel, eastern side of Rt. 35, ~1.5 kilometers north of Dongjeom railway station, far-southeastern Gangwon South Province, eastern South Korea (37° 05' 36.52" North latitude, 129° 02' 29.70" East longitude) (= stop 9 of Choi et al., 2004) Reference cited: Choi et al. (2004) - Cambrian in the Land of Morning Calm, IX International Conference of the Cambrian Stage Subdivision Working Group. Paleontological Society of Korea Special Publication 8: 36, 46-47. |
Date | |
Source | https://www.flickr.com/photos/47445767@N05/30066892076/ |
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@N05/30066892076 (archive). It was reviewed on 2 March 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
2 March 2020
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current | 22:41, 2 March 2020 | 1,280 × 960 (1.08 MB) | Ser Amantio di Nicolao (talk | contribs) | User created page with UploadWizard |
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Metadata
This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.
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Camera manufacturer | OLYMPUS OPTICAL CO.,LTD |
Camera model | C900Z,D400Z |
Exposure time | 1/264 sec (0.0037878787878788) |
F-number | f/3.4 |
ISO speed rating | 100 |
Date and time of data generation | 08:50, 17 September 2004 |
Lens focal length | 7.7 mm |
Orientation | Normal |
Horizontal resolution | 72 dpi |
Vertical resolution | 72 dpi |
Software used | Adobe Photoshop CS2 Macintosh |
File change date and time | 21:39, 3 October 2016 |
Y and C positioning | Co-sited |
Exif version | 2.1 |
Date and time of digitizing | 08:50, 17 September 2004 |
Meaning of each component |
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Image compression mode | 2 |
APEX exposure bias | 0 |
Maximum land aperture | 3 APEX (f/2.83) |
Metering mode | Pattern |
Light source | Unknown |
Flash | Flash did not fire |
Supported Flashpix version | 1 |
Color space | sRGB |
File source | Digital still camera |
Supported Flashpix version | 1 |
Image width | 1,280 px |
Image height | 960 px |
Date metadata was last modified | 17:39, 3 October 2016 |
IIM version | 2 |