Tonstein in bituminous coal (lower Cannel City-Amburgy Coal Zone, Pikeville Formation, Middle Pennsylvanian; Jackson North roadcut, Breathitt County, Kentucky, USA) 3 : 無料・フリー素材/写真
Tonstein in bituminous coal (lower Cannel City-Amburgy Coal Zone, Pikeville Formation, Middle Pennsylvanian; Jackson North roadcut, Breathitt County, Kentucky, USA) 3 / 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 | Tonstein in bituminous coal in the Pennsylvanian of Kentucky, USA.This exposure is part of a relatively new roadcut along new Route 15, north of the town of Jackson, Kentucky, USA. The outcrop has Pennsylvanian-aged cyclothemic sedimentary rocks of the Breathitt Group (formerly the Breathitt Formation). Shown above is the lower part of the Cannel City-Amburgy Coal Zone. The black-colored material is bituminous coal, which is a common variety of coal. It is relatively soft, sooty, has blocky-weathering, is well stratified and laminated, and has patches of glassy-lustered material (vitrain) in and among dull-lustered material. According to published information about this locality (see Greb & Eble, 2014), this bituminous coal has 11% ash and 1.9% sulfur. Its maceral content is dominated by vitrinite (~75%) and its plant microfossil content is dominated by lycopsid tree spores (~78%).The grayish-colored horizon in the middle of the photo is a tonstein. "Tonstein" refers to a diagenetically altered volcanic bed, or bentonite. When volcanic ash was deposited in ancient coal swamps, the acidic, reducing conditions altered the ash, resulting in a kaolinite-rich claystone bed.Stratigraphy: lower Cannel City-Amburgy Coal Zone, upper Pikeville Formation, Breathitt Group, lower Atokan Series (Duckmantian), lower Middle PennsylvanianLocation: Jackson North outcrop - large roadcut on the eastern side of new Rt. 15, just south of southbound old Rt. 15-new Rt. 15 split, north of Jackson, north-central Breathitt County, eastern Kentucky, USA (37° 34’ 53.95” North, 83° 23’ 07.99” West)------------------Reference cited:Greb & Eble (2014) - Cannel coals of the Cannel City-Amburgy Coal Bed (Pikeville Formation, Middle Pennsylvanian); evidence for possible fault-generated lakes. Geological Society of America Abstracts with Programs 46(6): 604. |
| 撮影日 | 2015-01-08 09:26:39 |
| 撮影者 | James St. John |
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