Corals in fossiliferous limestone (Jeffersonville Limestone, Middle Devonian; Falls of the Ohio, southern Indiana, USA) 18 : 無料・フリー素材/写真
Corals in fossiliferous limestone (Jeffersonville Limestone, Middle Devonian; Falls of the Ohio, southern Indiana, USA) 18 / 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 | Silicified solitary rugose corals in fossiliferous limestone in the Devonian of Indiana, USA.Exceedingly fossiliferous rocks of the Jeffersonville Limestone are well exposed at the famous Falls of the Ohio outcrop (Indiana side of the Ohio River at Louisville). These Middle Devonian rocks have abundant colonial and solitary corals (tabulates and rugosans), plus other typical Paleozoic shallow carbonate seafloor invertebrates (e.g., brachiopods, bryozoans, crinoids). The shells and skeletons in portions of the Jeffersonville Limestone have been silicified (replaced by quartz/silica - SiO2). The silicified fossils are more resistant to weathering than the limestone host rock. Upon weathering and erosion, the fossils stand out in relief, or are weathered completely free of matrix.Stratigraphy: Jeffersonville Limestone, lower Middle DevonianLocality: northern shore of the Ohio River, across from the city of Louisville, west of the Falls of the Ohio rapids, southern margin of Clark County, southern Indiana, USA (vicinity of 38° 16' 42.32" North, 85° 45' 57.79" West)----------------------------------See info. at:en.wikipedia.org/wiki/Rugosa |
| 撮影日 | 2010-08-02 14:32:58 |
| 撮影者 | James St. John |
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