Pseudoperna congesta fossil osyters encrusting a Platyceramus platinus inoceramid bivalve shell (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
Pseudoperna congesta fossil osyters encrusting a Platyceramus platinus inoceramid bivalve shell (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 | Pseudoperna congesta (Conrad in Nicollet, 1843) - fossil oysters encrusting a Platyceramus platinus inoceramid bivalve shell in the Cretaceous of Kansas, USA.The light-colored, irregularly-shaped structures shown above are Pseudoperna fossil oysters that are encrusting a portion of a large inoceramid bivalve shell that is eroding from Cretaceous-aged chalk in western Kansas. Inoceramids 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. Hard-substrate encrusting organisms such as oysters could not occupy such soft seafloors so they preferentially attached to the mineralized biologic surfaces of inoceramids.Classification of encrusting Pseudoperna oysters: Animalia, Mollusca, Bivalvia, Ostreoida, OstreidaeClassification of host inoceramid bivalve: 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 11:28:12 |
| 撮影者 | James St. John |
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