Platyceramus platinus inoceramid bivalve in chalk (Smoky Hill Chalk Member, Niobrara Formation, Upper Cretaceous; Castle Rock chalk badlands, south of Quinter, Kansas, USA) 6 : 無料・フリー素材/写真
Platyceramus platinus inoceramid bivalve in chalk (Smoky Hill Chalk Member, Niobrara Formation, Upper Cretaceous; Castle Rock chalk badlands, south of Quinter, Kansas, USA) 6 / 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 | Platyceramus platinus (Logan, 1898) - fossil bivalve in chalk in the Cretaceous of Kansas, USA.Inoceramid bivalves included the largest clams in Earth history - they are known to have reached about 10 feet in size (for a complete specimen, see: en.wikipedia.org/wiki/Platyceramus#/media/File:Platyceram...). Inoceramids are often described as having a turkey platter morphology - they had large, relatively thin shells that spread out their weight on soft, fine-grained, nonlithified chalk seafloors.The above photo depicts the margin of a large Platyceramus bivalve shell eroding from an outcrop of chalk near Castle Rock, south of Quinter, Kansas. These fossils are relatively common at this locality and at other chalk exposures in western Kansas.Classification: Animalia, Mollusca, Bivalvia, Pteriomorphia, Praecardioida, InoceramidaeStratigraphy: Smoky Hill Chalk Member (a.k.a. Smoky Hills Member), Niobrara Formation, Upper CretaceousLocality: Castle Rock chalk badlands, north of Gove County Road K & east of Castle Rock Road, 23 kilometers south-southeast of the town of Quinter, eastern Gove County, western Kansas, USA |
| 撮影日 | 2015-07-17 12:29:23 |
| 撮影者 | James St. John |
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