File:Pseudoperna congesta fossil osyters encrusting a Platyceramus platinus shell.jpg
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Summary
| Description |
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, Ostreidae Classification of host inoceramid bivalve: Animalia, Mollusca, Bivalvia, Pteriomorphia, Praecardioida, Inoceramidae Stratigraphy: Smoky Hill Chalk Member (a.k.a. Smoky Hills Member), Niobrara Formation, Upper Cretaceous Locality: 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 |
| Date | |
| Source | 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 |
| Author | James St. John |
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This image was originally posted to Flickr by jsj1771 at https://flickr.com/photos/47445767@N05/19928996925. It was reviewed on 23 July 2015 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 20:14, 23 July 2015 | | 4,000 × 3,000 (3.79 MB) | Tillman | Transferred from Flickr via Flickr2Commons |
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