Composite ironstone concretion (gravel bar clast, Chatham, Ohio, USA) 2 : 無料・フリー素材/写真
Composite ironstone concretion (gravel bar clast, Chatham, Ohio, USA) 2 / 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 | (centimeter scale)This rock is from a gravel bar along a creek at Chatham, Ohio. It was eroded from local or near-local Mississippian-aged bedrock - probably from the Logan Formation (Osagean Stage, upper Lower Mississippian).The sample is composed of over a dozen 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 clast derived from Pleistocene glacial driftLocality: gravel bar on the western side of the town of Chatham, northern Licking County, east-central Ohio, USA |
| 撮影日 | 2018-04-04 18:08:14 |
| 撮影者 | James St. John |
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