File:Mudcracks (Canyon de Chelly National Monument, Arizona, USA) 3.jpg

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English: Curled mudcracks in Arizona, USA. (3 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 upward as they dried.

Locality: Tsegi overlook area, Canyon de Chelly National Monument, east-southeast of the town of Chinle, northern Apache County, northeastern Arizona, USA
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Source https://www.flickr.com/photos/47445767@N05/29738052000/
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@N05/29738052000 (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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