File:Travertine drapery (Ohio Caverns, western Ohio, USA) 2 (30906647436).jpg
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Ohio Caverns is the largest cave system in Ohio. It is located in a bedrock knob called Mt. Tabor on the southern side of the Bellefontaine Outlier (= Ohio's elevationally highest area). The cave is hosted in the Middle Devonian Columbus Limestone, which is part of a widespread shallow marine carbonate succession in eastern and midwestern America. The general term for all secondary mineral deposits occurring in caves is speleothem. Between 200 and 300 different minerals have been reported to occur in various speleothems around the world. The most common speleothem minerals are calcite (CaCO3), aragonite (CaCO3), and gypsum (CaSO4·2H2O). Calcitic speleothem is given the rock name travertine. Varieties of cave travertine are named based on morphology and origin. The most common type is dripstone, which includes stalactites, stalagmites, and columns. Other varieties include flowstone, knobstone (a.k.a. coralloids), helictites, shelfstone, rimstone, cave pearls, frostwork, etc. Shown above is a travertine drapery, which is a variety of dripstone. Dripstone forms by precipitation of minerals (in this case, calcium carbonate - calcite) from dripping water. Dripstone structures attached to cave ceilings or upper walls are called stalactites. The corresponding structures on cave floors are called stalagmites. When fused together, they form columns. Relatively thin, sheet-like to wrinkled curtains of dripstone are called draperies, formed by calcium carbonate precipitation from water drips that descend along slanted cave ceilings or upper walls. Pure travertine is white. The discoloration seen in this travertine drapery is due to iron oxide impurity. Bands of impurities make some draperies have a bacon-like appearance and are called "cave bacon". Locality: Ohio Caverns, Mt. Tabor, east of the town of West Liberty, northern margin of Champaign County, western Ohio, USA For a recent technical article on the geology of Ohio Caverns, see: <a href="http://scholarcommons.usf.edu/ijs/vol45/iss1/7/" rel="nofollow">scholarcommons.usf.edu/ijs/vol45/iss1/7/</a> |
| Date | |
| Source | Travertine drapery (Ohio Caverns, western Ohio, USA) 2 |
| 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@N05/30906647436 (archive). It was reviewed on 12 October 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| current | 13:40, 12 October 2019 | | 4,000 × 3,000 (4.93 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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