Differentially eroded lacustrine sedimentary rocks (New Mexico, USA) 2 : 無料・フリー素材/写真
Differentially eroded lacustrine sedimentary rocks (New Mexico, USA) 2 / 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 | Differential weathering and differential erosion are often (jokingly) the default explanations for odd-looking rocks or unusual geologic scenery (e.g., Arches National Park & Fantasy Canyon in Utah). But they are important, real-life processes. Differential weathering and differential erosion refer to hard, resistant rocks & minerals weathering and eroding slowly and softer, less-resistant rocks & minerals eroding quickly.The rock seen here no provenance or specific geologic information accompanying it, apart from it being from a New Mexico lake deposit. Some rockhounds call specimens like this as "New Mexico Silt Columns". The gray material is silty. The dark-colored unit at top and the brownish-colored, projecting layers may be chert (?). Regardless, the gray silty layers are relatively soft and have weathered away more quickly than the brown layers - classic differential weathering and erosion. |
| 撮影日 | 2018-03-28 18:20:53 |
| 撮影者 | James St. John |
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