File:Asymmetrical ripples on sandstone 4 (23980884696).jpg

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Asymmetrical ripple marks in Jurassic sandstone (cross-section view).

The ridges on the rock shown above are asymmetrical ripples. Asymmetrical ripple marks have a long side and a short side, when viewed in cross-section. They form in a one-directional current by wind or water. The current direction was toward the short side of each ripple (to the left in this case).

Locality: loose piece at roadcut along Rim Rock Road near Artists Point overlook, Colorado National Monument, western Colorado, USA
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Source Asymmetrical ripples on sandstone 4
Author James St. John

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This file is licensed under the Creative Commons Attribution 2.0 Generic license.
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/23980884696. 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.

6 December 2019

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Date/TimeThumbnailDimensionsUserComment
current03:59, 6 December 2019Thumbnail for version as of 03:59, 6 December 20192,503 × 1,341 (2.55 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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