File:Rippled sandstone (Parachilna Formation, Lower Cambrian; Three Sisters Range, South Australia) 1.jpg
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| Description |
English: Sandstones in the Cambrian of South Australia.
Seen here are structurally tilted sandstones in the near-basal Cambrian of the South Australian Outback. This is the Parachilna Formation, a burrowed sandstone-siltstone succession and the basal-preserved Cambrian unit in the area. The beds are steeply dipping eastward - they are almost vertical. This site is on the western flank of a large syncline. The prominent ridges on the exposed bedding plane are ripple marks. They appear to be more or less evenly-shaped and thus are symmetrical ripple marks. Symmetrical ripples form as the result of a two-directional, back-and-forth current in very shallow water by wave action. Stratigraphy: Parachilna Formation, upper Nemakit-Daldynian Stage to lower Tommotian Stage, lower Lower Cambrian Locality: Mernmerna section - dry creek cut south of Merna Mora & north-northwest of Hawker, eastern side of the Three Sisters Range, South Australia (vicinity of 31° 34' 22.69" South latitude, 138° 24' 39.64" East longitude) |
| Date | |
| Source | https://www.flickr.com/photos/47445767@N05/49965293798/ |
| 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@N05/49965293798. It was reviewed on 23 April 2022 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 | |
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| current | 17:57, 23 April 2022 | | 3,008 × 2,000 (5.49 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/49965293798/ with UploadWizard |
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