File:Coal (Menefee Formation, Upper Cretaceous; National King Coal Mine, Hay Gulch, Colorado, USA) 3 (22486553294).jpg
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| Description |
Coal from the Cretaceous of Colorado, USA. (public display, Durango & Silverton Narrow Gauge Railroad Museum, Durango, Colorado, USA) Coal is a carbonaceous, biogenic sedimentary rock composed of the altered remains of plant material in ancient swamp environments. The precursor to coal is peat - a very loosely consolidated, highly porous, lightweight mass of plant fragments. With burial and diagenesis, the peat is altered to various ranks of coal - lignite coal, sub-bituminous coal, and bituminous coal. With very low grade metamorphism, bituminous coal becomes semi-anthracite coal and then anthracite coal. Each successive coal rank is harder, heavier, more carbon-rich, and hotter-burning. The coal shown above appears to be a bituminous coal. It comes from a coal mine in Hay Gulch in southwestern Colorado. Coal from this locality is used to power steam locomotives of the Durango & Silverton Narrow Gauge Railroad, which operates tourist trains between those two towns in Colorado's San Juan Mountains. Stratigraphy: Menefee Formation, Campanian Stage, upper Upper Cretaceous Locality: National King Coal Mine, Hay Gulch, western La Plata County, southwestern Colorado, USA |
| Date | |
| Source | Coal (Menefee Formation, Upper Cretaceous; National King Coal Mine, Hay Gulch, Colorado, USA) 3 |
| 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@N05/22486553294 (archive). It was reviewed on 1 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 | |
|---|---|---|---|---|---|
| current | 08:57, 1 December 2019 | | 2,426 × 2,680 (4.61 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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