Composite ironstone concretion 5 : 無料・フリー素材/写真
Composite ironstone concretion 5 / 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 | This visually-intriguing rock is composed of multiple small to medium-sized, subspherical ironstone nodules (= iron oxide rock). They have become cemented together by a crust of the same iron oxide material. This material could also be called mammillary ironstone.Provenance: modern fluvial gravel bar in Ohio; mammillary ironstone like this supposedly occurs at the Mississippian-Pennsylvanian unconformity in parts of Ohio |
| 撮影日 | 2021-05-02 23:37:00 |
| 撮影者 | James St. John |
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