File:Gryphaea dilobotes (fossil oyster) (Kellaways Formation, Middle Jurassic; England) 3.jpg
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[edit]DescriptionGryphaea dilobotes (fossil oyster) (Kellaways Formation, Middle Jurassic; England) 3.jpg |
English: Gryphaea dilobotes Duff, 1978 - fossil oyster shell from the Jurassic of England. (dorsal view of left valve)
Orientation: To the right - anterior To the left - posterior side & posterior flange Most modern and fossil clams have asymmetrically-shaped but equal-sized shells that are mirror images of each other. Oyster shells depart radically from this general rule. The Gryphaea oysters evolved a greatly enlarged, coiled, highly convex left valve & a greatly reduced, concave right valve. The overall shape of gryphaeid oyster shells was a consequence of their living on soft, fine-grained substrates. All oysters are filter feeders, and practically all are hard substrate encrusters at some point in their ontogeny. The highly coiled Gryphaea oysters are free-living forms as large adults. Their shell shape appears to be the result of repeated downward toppling into the mud along the ventral margin of the left valve by the weight of the shell. Classification: Animalia, Mollusca, Bivalvia, Pteriomorphia, Pterioida, Ostreina, Ostreoidea, Gryphaeidae Stratigraphy: Kellaways Formation, Callovian Stage, upper Middle Jurassic Locality: unrecorded/undisclosed site in England |
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Source | https://www.flickr.com/photos/47445767@N05/50553472322/ |
Author | James St. John |
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/50553472322. It was reviewed on 2 November 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
2 November 2020
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current | 16:42, 2 November 2020 | ![]() | 2,207 × 1,861 (2.98 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/50553472322/ with UploadWizard |
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Camera manufacturer | Canon |
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Camera model | Canon PowerShot D10 |
Exposure time | 1/60 sec (0.016666666666667) |
F-number | f/11 |
ISO speed rating | 80 |
Date and time of data generation | 15:33, 27 October 2020 |
Lens focal length | 11.614 mm |
Width | 4,000 px |
Height | 3,000 px |
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Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
Software used | Adobe Photoshop Elements 18.0 (Macintosh) |
File change date and time | 21:46, 31 October 2020 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 15:33, 27 October 2020 |
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Image compression mode | 3 |
APEX shutter speed | 5.90625 |
APEX aperture | 6.90625 |
APEX exposure bias | −1 |
Maximum land aperture | 4 APEX (f/4) |
Metering mode | Pattern |
Flash | Flash fired, compulsory flash firing, red-eye reduction mode |
Supported Flashpix version | 1 |
Color space | sRGB |
Focal plane X resolution | 16,460.905349794 |
Focal plane Y resolution | 16,483.516483516 |
Focal plane resolution unit | inches |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Custom image processing | Normal process |
Exposure mode | Manual exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Scene capture type | Standard |
Lens used | 6.2-18.6 mm |
Date metadata was last modified | 18:46, 31 October 2020 |
Unique ID of original document | A6AE76581F6E9FE2971A9A2B2A706725 |