File:Pseudoperna congesta fossil osyters encrusting a Platyceramus platinus shell.jpg
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DescriptionPseudoperna congesta fossil osyters encrusting a Platyceramus platinus shell.jpg |
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. |
23 July 2015
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Date and time of data generation | 11:28, 17 July 2015 |
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File change date and time | 20:56, 22 July 2015 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 11:28, 17 July 2015 |
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Date metadata was last modified | 16:56, 22 July 2015 |
Unique ID of original document | FA938E6201691FBD841125647134BBAC |