Structurally-folded clayshales (Bedford Shale, Upper Devonian; Blendon Woods, Columbus, Ohio, USA) 1a : 無料・フリー素材/写真
Structurally-folded clayshales (Bedford Shale, Upper Devonian; Blendon Woods, Columbus, Ohio, USA) 1a / 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 | Structurally-folded shales in the Devonian of Ohio, USA.Folds are geologic structures principally formed by compressional stress.Anticlines - uparched portions of folds.Synclines - downarched portions of folds.Monoclines - kinks or bends in rock layers.Plunging folds - folds with non-horizontal axesOverturned folds - partially or completely upside-down folds.Recumbent folds - folds lying on their sides are called recumbent folds.Drag folds - bent rock layers immediately adjacent to faults.This is a highlighted version of the previous picture in the photostream - it better shows the shape of the folding here.The host rocks are soft, grayish and grayish-brown clayshales of the Bedford Shale. Shales are incompetent rocks - they are easily structurally deformed when subjected to relatively low levels of stress.I suspect that the main anticline in this outcrop is cored by a small fault, but it's difficult to discern the situation due to stream erosion of the subcrop.Stratigraphy: Bedford Shale, Famennian Stage, upper Upper DevonianLocality: stream cut in Blendon Woods Park, Columbus, northeastern Franklin County, central Ohio, USA |
| 撮影日 | 2017-07-11 00:48:53 |
| 撮影者 | James St. John |
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