File:Chesapecten jeffersonius (fossil scallop) (Yorktown Formation, Lower Pliocene; Williamsburg, Virginia, USA) 1.jpg
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[edit]DescriptionChesapecten jeffersonius (fossil scallop) (Yorktown Formation, Lower Pliocene; Williamsburg, Virginia, USA) 1.jpg |
English: Chesapecten jeffersonius (Say, 1824) - fossil scallop from the Pliocene of Virginia, USA. (exterior of a right valve)
Bivalves are bilaterally symmetrical molluscs having two calcareous, asymmetrical shells (valves) - they include the clams, oysters, and scallops. In most bivalves, the two shells are mirror images of each other (the major exception is the oysters). They occur in marine, estuarine, and freshwater environments. Bivalves are also known as pelecypods and lamellibranchiates. Bivalves are sessile, benthic organisms - they occur on or below substrates. Most of them are filter-feeders, using siphons to bring in water, filter the water for tiny particles of food, then expel the used water. The majority of bivalves are infaunal - they burrow into unlithified sediments. In hard substrate environments, some forms make borings, in which the bivalve lives. Some groups are hard substrate encrusters, using a mineral cement to attach to rocks, shells, or wood. The fossil record of bivalves is Cambrian to Recent. They are especially common in the post-Paleozoic fossil record. Scallops are common marine bivalves in much of the fossil record and in the modern oceans. Individual bivalve shells, unlike brachiopod shells, are asymmetrical. Scallop shells sometimes approach bilateral symmetry, but the subtriangular, wing-like auricles along the hingeline will still display asymmetry. One of the auricles has a basal notch. A notched auricle on the right side of a shell indicates a right valve. A notched auricle on the left side of a shell indicates a left valve. If the auricles are partially broken or eroded, the preserved growth lines will indicate which side had the notch. Classification: Mollusca, Bivalvia, Pteriomorphia, Pectinoida, Pectinidae Stratigraphy: Yorktown Formation, Lower Pliocene Locality: unrecorded/undisclosed site at or near the town of Williamsburg, Virginia, USA See info. at: en.wikipedia.org/wiki/Chesapecten_jeffersonius and en.wikipedia.org/wiki/Scallop |
Date | |
Source | https://www.flickr.com/photos/47445767@N05/50743036578/ |
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@N05/50743036578. It was reviewed on 21 December 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
21 December 2020
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current | 14:44, 21 December 2020 | 2,683 × 2,341 (4.31 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/50743036578/ with UploadWizard |
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Camera manufacturer | Canon |
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Camera model | Canon PowerShot D10 |
Exposure time | 1/160 sec (0.00625) |
F-number | f/3.2 |
ISO speed rating | 80 |
Date and time of data generation | 23:45, 17 December 2020 |
Lens focal length | 8.295 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 | 08:14, 21 December 2020 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 23:45, 17 December 2020 |
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Image compression mode | 3 |
APEX shutter speed | 7.3125 |
APEX aperture | 3.34375 |
APEX exposure bias | 0 |
Maximum land aperture | 3.34375 APEX (f/3.19) |
Metering mode | Pattern |
Flash | Flash did not fire, compulsory flash suppression |
Supported Flashpix version | 1 |
Color space | sRGB |
Focal plane X resolution | 16,460.905349794 |
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Focal plane resolution unit | inches |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Custom image processing | Normal process |
Exposure mode | Auto 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 | 03:14, 21 December 2020 |
Unique ID of original document | 03E43A5BB6E8CF41EFED65F7C235F3A2 |