Curled mudcracks (Coal Vein Trail, Roosevelt National Park, Little Missouri Badlands, North Dakota, USA) : 無料・フリー素材/写真
Curled mudcracks (Coal Vein Trail, Roosevelt National Park, Little Missouri Badlands, North Dakota, USA) / James St. John
| ライセンス | クリエイティブ・コモンズ 表示 2.1 |
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| 説明 | Modern curled mudcracks in North Dakota, USA. (28 August 2008)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 seen here have curled upward as they dried.Locality: along Coal Vein Trail, Little Missouri Badlands, South Unit of Roosevelt National Park, western North Dakota, USA |
| 撮影日 | 2008-08-28 14:57:58 |
| 撮影者 | James St. John |
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