File:Semi-anthracite coal (Langhorne Coal, Lower Mississippian; Cloyds Mountain roadcut, Valley Coalfield, Virginia, USA) 11 (30394752491).jpg
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Semi-anthracite coal in the Mississippian of Virginia, USA. This is the best outcrop anywhere of the only economically significant Mississippian-aged coal occurrence in the world. The beds were structurally tilted during the Allegheny Orogeny in the Pennsylvanian. The coal bed shown above is the Langhorne Coal. Just below it (= at upper left) is a hard sandstone. Stratigraphically above the Langhorne Coal (= at upper right) is a mudshale-dominated interval. At this site, the Langhorne Coal is tectonically-thickened and sheared. The unit contains semi-anthracite coal, which is the result of very low grade metamorphism of bituminous coal. Adjacent beds (shales and sandstones) are not metamorphosed. The Langhorne Coal has been mined in the past. Stratigraphy: uppermost lower member (= sandstone at left) & lowermost upper member (= coal + overlying shale), Price Formation, Osagean Stage, upper Lower Mississippian Locality: roadcut on the eastern side of Rt. 100, western end of Cloyds Mountain, south of the town of Poplar Hill, Pulaski County, Valley Coalfield, southwestern Virginia, USA (= locality shown in figure 9 of Bartholomew & Brown, 1992) (37° 10' 42.39" North latitude, 80° 42' 48.48" West longitude) Some info. from: Bartholomew, M.J. & K.E. Brown. 1992. The Valley Coalfield (Mississippian age) in Montgomery and Pulaski Counties, Virginia. Virginia Division of Mineral Resources Publication 124. 33 pp. 2 pls. Gensel, P.G. & K.B. Pigg. 2010. An arborescent lycopsid from the Lower Carboniferous Price Formation, southwestern Virginia, USA and the problem of species delimitation. International Journal of Coal Geology 83: 132-145. |
| Date | |
| Source | Semi-anthracite coal (Langhorne Coal, Lower Mississippian; Cloyds Mountain roadcut, Valley Coalfield, Virginia, USA) 11 |
| Author | James St. John |
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/30394752491 (archive). It was reviewed on 7 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
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| current | 17:59, 7 December 2019 | | 3,000 × 4,000 (5.35 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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