Travertine stalactites (Diamond Caverns, Kentucky, USA) 3 : 無料・フリー素材/写真
Travertine stalactites (Diamond Caverns, 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 | "Cave formations" are technically called "speleothem". Most speleothem is composed of travertine, a crystalline-textured chemical sedimentary rock composed of calcite (CaCO3). Travertine forms in most caves and at some springs by precipitation of crystals from water. Travertine speleothem occurs in a wide variety of forms. The most common variety of travertine speleothem is dripstone (seen here), which forms by the action of dripping water. The second-most common type of travertine speleothem is flowstone, which forms by precipitation of crystals from relatively thin films of flowing water. Flowstone typically has the appearance of a frozen waterfalls.Pure travertine is white. The coloration present in the travertine seen above is from iron oxide impurities.Downward-tapering or cylindrical dripstone structures attached to cave ceilings or upper walls are called stalactites. The equivalent structures on the floor are called stalagmites. When fused together, they form columns.Locality: Diamond Caverns, ~1.7 air-miles north-northwest of the town of Park City, northwestern Barren County, west-central Kentucky, USA |
| 撮影日 | 2008-07-15 16:59:02 |
| 撮影者 | James St. John |
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