Erionite siltstone with gaylussite crystal casts (Green Beds, Upper Pleistocene, 40 ka; southeastern shoreline of Lake Magadi, Kenya, East African Rift Valley) : 無料・フリー素材/写真
Erionite siltstone with gaylussite crystal casts (Green Beds, Upper Pleistocene, 40 ka; southeastern shoreline of Lake Magadi, Kenya, East African Rift Valley) / 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 | Erionite siltstone (12.0 cm across at its widest) with gaylussite crystal casts (Na2Ca(CO3)2·5H2O) or calcite (CaCO3).This unusual pale-greenish siltstone was deposited in a rift basin lake environment in eastern Africa, interbedded with gray chemical cherts. The sole (bottom bedding plane) of the rock is shown. The pale greenish material is erionite siltstone - erionite is one of the zeolite minerals, having the formula Ca3K2Na2(Al10Si26O72)·30H2O. Stratigraphy & Age: bedded cherts of the upper Green Beds (a.k.a. lower High Magadi Beds; a.k.a. upper Chert Series), upper Upper Pleistocene, 40 k.y. Locality: shoreline outcrop along the southeastern shore of Lake Magadi, southwestern Kenya, East African Rift Valley (vicinity of 01º 57’ South, 36º 16’ East). |
| 撮影日 | 2014-08-25 21:37:20 |
| 撮影者 | James St. John |
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