Mudcracked limestone (Tyrone Limestone, Middle Ordovician, 454 Ma; Frankfort, Kentucky) 2 : 無料・フリー素材/写真
Mudcracked limestone (Tyrone Limestone, Middle Ordovician, 454 Ma; Frankfort, Kentucky) 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 | Mudcracked lime mudstone from the Ordovician of Kentucky, USA. (~9.6 centimeters across along the base)Mudcracks are diagnostic sedimentary structures indicating subaerial exposure of sediment surfaces, with alternating wet & dry conditions. They are much more common that raindrop imprints, which indicate the same environmental setting. Mudcracks are most likely to occur in fine-grained siliciclastic rocks, fine-grained carbonate sediments, and in some evaporitic successions. Mudcracks are distinctive and easy to identify, but they do vary in appearance. The cracks themselves vary in width, depth, and areal density. Mudcrack polygons also vary in size & shape.Stratigraphy: upper Tyrone Limestone (just above the Deicke Bentonite), Black River Group, upper Middle Ordovician (sensu traditio), 454 MaLocality: abandoned quarry near the intersection of Route 127 and Route 421, northern side of the town of Frankfort, south-central Franklin County, north-central Kentucky, USA |
| 撮影日 | 2020-03-02 14:48:52 |
| 撮影者 | James St. John |
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