Chert nodule in limestone (Great Relief Hall, Mammoth Cave, Kentucky, USA) 1 : 無料・フリー素材/写真
Chert nodule in limestone (Great Relief Hall, Mammoth Cave, Kentucky, USA) 1 / 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 | Western Kentucky's Mammoth Cave is the longest cave system on Earth, with 412 miles known and mapped as of fall 2017. The name does not refer to the early discovery of fossil mastodon or mammoth bones here. Rather, the name refers to the immense size of many rooms and passages.Shown here is a subspherical chert nodule protruding from a limestone ceiling in Great Relief Hall, a Level D phreatic passage in the Mammoth Cave system. Chert (also known as flint) is a cryptocrystalline quartzose sedimentary rock. It is generally resistant to weathering, erosion, and dissolution.Stratigraphy: Fredonia Member, Ste. Genevieve Limestone, upper Middle MississippianLocality: Great Relief Hall, lower Level D, Mammoth Cave, west-central Kentucky, USA |
| 撮影日 | 2018-02-20 20:46:26 |
| 撮影者 | James St. John |
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