File:Mudcracks (molds on base of sandstone bed, ABC Range Quartzite, Ediacaran, Neoproterozoic; Pichi Richi Pass railroad cut, South Flinders Ranges, South Australia) 2 (29738290840).jpg
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| Description |
Mudcracks in the Precambrian of South Australia. 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 fantastic mudcracks shown above are on the base of a well-cemented quartzose sandstone bed - the original fine-grained unit in which the cracks were developed is now gone. The beds here have been tilted to near vertical by tectonic activity. The viewer is facing toward "stratigraphic up". Stratigraphy: ABC Range Quartzite, lower Ediacaran, upper Neoproterozoic Locality: Pichi Richi Pass railroad cut (eastern side of railroad), eastern side of Rt. 47, Pichi Richi Pass, southern part of the South Flinders Ranges, between the towns of Stirling North & Quorn, South Australia (32° 26' 18.29" South latitude, 137° 58' 40.28" East longitude) |
| Date | |
| Source | Mudcracks (molds on base of sandstone bed, ABC Range Quartzite, Ediacaran, Neoproterozoic; Pichi Richi Pass railroad cut, South Flinders Ranges, South Australia) 2 |
| 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@N05/29738290840 (archive). It was reviewed on 6 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 02:12, 6 December 2019 | | 3,008 × 2,000 (4.89 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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