File:Mudcracks (El Malpais National Monument, New Mexico, USA).jpg

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English: Modern mudcracks in New Mexico, USA. (1 September 2007)

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 sediments, fine-grained carbonate sediments, and in some evaporitic settings.

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 crusts of the modern examples shown above have curled slightly upward as they dried.

Locality: dry creek along La Ventana Natural Arch hiking trail, El Malpais National Monument, central Cibola County, western New Mexico, USA
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Source https://www.flickr.com/photos/47445767@N05/29737237810/
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@N05/29737237810 (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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current22:41, 2 March 2020Thumbnail for version as of 22:41, 2 March 20203,008 × 2,000 (3.67 MB)Ser Amantio di Nicolao (talk | contribs)User created page with UploadWizard

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