File:Manganese oxide-coated chert in limestone (Lost River Chert Bed, Middle Mississippian; Martel Avenue, Mammoth Cave, Kentucky, USA) 13 (24145978758).jpg
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| Description |
Chert horizon in limestone in the Mississippian of Kentucky, USA. The dark-colored, moth-eaten, ratty-looking rocks at the middle of the photo are weathered and eroded cherts. This is part of the Mississippian-aged Lost River Chert Bed, which consists of >1 horizon in a limestone succession. It is a laterally-discontinuous horizon and does not consist of discrete, subrounded chert nodules. Chert is a cryptocrystalline, quartzose sedimentary rock. It is not readily prone to dissolution by slightly acidic groundwater, unlike limestone. In cave passages, the chert is an erosion-resistant unit and often protrudes slightly to prominently from the surrounding limestone walls. Chert, being composed of quartz (SiO2), is hard (H = 7 on the Mohs Hardness Scale). Underground samples of Lost River Chert Bed do not have hard surfaces, however. The exposed rock in this horizon usually has a dark-colored, often black, coating of one or more manganese oxide minerals. The Mn-oxide coatings are relatively soft. The underlying chert is hard. Stratigraphy: Lost River Chert Bed, Horse Cave Member, upper St. Louis Limestone, upper Middle Mississippian Locality: outcrop along Martel Avenue, Mammoth Cave Ridge, Mammoth Cave National Park, western Kentucky, USA |
| Date | |
| Source | Manganese oxide-coated chert in limestone (Lost River Chert Bed, Middle Mississippian; Martel Avenue, Mammoth Cave, Kentucky, USA) 13 |
| 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@N05/24145978758 (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 | |
|---|---|---|---|---|---|
| current | 18:08, 7 December 2019 | | 4,000 × 3,000 (5.04 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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