Shatterconed sandstone (Serpent Mound Impact Structure, southern Ohio, USA) 7 : 無料・フリー素材/写真
Shatterconed sandstone (Serpent Mound Impact Structure, southern Ohio, USA) 7 / 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 | Shattercones from the Paleozoic of Ohio, USA.Shattercones are striated conical structures in rocks formed by a powerful shock wave or pressure front moving through during an impact event. They have a three-dimensional cone-like structure, with the points of the cones directed toward the shock wave origination site. Undisturbed shatterconed rocks will have the apex of the cones pointing toward the direction of the incoming object (i.e., upward - toward space).The decent-sized sample seen here is shatterconed sandstone from the deeply eroded Serpent Mound Impact Structure in southern Ohio. The youngest disturbed rocks I have observed in the structure are in the Berea Sandstone (uppermost Devonian to lowermost Mississippian) - this specimen is from the Berea. Paleomagnetic dating by the Ohio Geological Survey has indicated that the Serpent Mound Impact occurred during the Pennsylvanian or Permian. |
| 撮影日 | 2014-06-27 17:39:46 |
| 撮影者 | James St. John |
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