Ferruginous dolostone & pelletal glauconite beds (Floyds Knob Bed, Fort Payne Formation, Lower Mississippian; Burkesville West Rt. 90 roadcut, Kentucky, USA) 7 : 無料・フリー素材/写真
Ferruginous dolostone & pelletal glauconite beds (Floyds Knob Bed, Fort Payne Formation, Lower Mississippian; Burkesville West Rt. 90 roadcut, Kentucky, 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 | The Fort Payne Formation of southern Kentucky & Tennessee is a shale and limestone succession of Early Mississippian age. Fossils are common to abundant in many intervals. The unit is dominated by crinoids, which are stalked, sessile, benthic, filter-feeding echinoderms (see: www.flickr.com/photos/jsjgeology/albums/72157647779397286).Seen here is a weathered & eroded rock from the Floyds Knob Bed. It is a distinctive horizon in an otherwise gray shale succession in the lower Fort Payne Formation. At this site, the Floyds Knob consists of about 1.5 meters worth of brick red and speckled dark green rocks (click on the photo to zoom in). The brick red rocks are ferruginous dolostones (= medium gray-brown on fresh, crack surfaces). The speckled dark green rocks are peloidal glauconite and glauconitic limestone beds. Marine body fossils and trace fossils are present, including corals, brachiopods, bryozoans, bivalves, trilobites, ostracods, and crinoids. The small lima bean-like structures below the center of the photo are ostracods (= bivalved crustaceans).Stratigraphy: Floyds Knob Bed, Fort Payne Formation, Osagean Stage, upper Lower MississippianLocality: roadcut along Route 90, just west of Burkesville, Kentucky, USA (36° 47’ 58.81” North latitude, 85° 22’ 58.64” West longitude)------------------------Some info. from:Ettensohn et al. (2012) - The Early-Middle Mississippian Borden-Grainger-Fort Payne delta/basin complex: field evidence for delta sedimentation, basin starvation, mud-mound genesis, and tectonism during the Neoacadian Orogeny. Geological Society of America Field Guide 29: 345-395. |
| 撮影日 | 2018-03-13 16:47:53 |
| 撮影者 | James St. John |
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