File:Diacalymene ouzregui fossil trilobite (Upper Ktaoua Formation, Upper Ordovician; southeastern Morocco) 1.jpg
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[edit]DescriptionDiacalymene ouzregui fossil trilobite (Upper Ktaoua Formation, Upper Ordovician; southeastern Morocco) 1.jpg |
English: Diacalymene ouzregui (Destombes, 1966) fossil trilobite from the Ordovician of Morocco. (9.9 cm long)
Trilobites are extinct marine arthropods. They first appear in Lower Cambrian rocks and the entire group went extinct at the end of the Permian. Trilobites had a calcitic exoskeleton and nonmineralizing parts underneath (legs, gills, gut, etc.). The calcite skeleton is most commonly preserved in the fossil record, although soft-part preservation is known in some trilobites (Ex: Burgess Shale and Hunsruck Slate). Trilobites had a head (cephalon), a body of many segments (thorax), and a tail (pygidium). Molts and carcasses usually fell apart quickly - most trilobite fossils are isolated parts of the head (cranidium and free cheeks), individual thoracic segments, or isolated pygidia. The name "trilobite" was introduced in 1771 by Johann Ernst Immanuel Walch and refers to the tripartite division of the trilobite body - it has a central axial lobe that runs longitudinally from the head to the tail, plus two side lobes (pleural lobes). The trilobite shown above is Diacalymene ouzregui from the Ordovician of Morocco. These specimens are relatively common and are frequently seen in the fossil retail market. Classification: Animalia, Arthropoda, Trilobita, Polymerida, Calymenidae Stratigraphy: middle part of the Upper Ktaoua Formation, upper Ktaoua Group, Rawtheyan Stage, upper Upper Ordovician (~equivalent to the upper Richmondian Stage of the upper Cincinnatian Series) Locality: unrecorded/undisclosed site in Morocco, but likely from near Tazoulait, ~50 km east of Alnif, ~92 km west-southwest of Rissani, southern foothills of the Anti-Atlas Mountains, southeastern Morocco |
Date | |
Source | https://www.flickr.com/photos/47445767@N05/25554945984/ |
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@N05/25554945984. It was reviewed on 13 October 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
13 October 2020
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current | 01:53, 13 October 2020 | 2,092 × 3,192 (4.32 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/25554945984/ 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/9 |
ISO speed rating | 80 |
Date and time of data generation | 18:22, 31 March 2016 |
Lens focal length | 8.295 mm |
Orientation | Normal |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
Software used | Adobe Photoshop CS2 Macintosh |
File change date and time | 18:32, 31 March 2016 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 18:22, 31 March 2016 |
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APEX shutter speed | 5.90625 |
APEX aperture | 6.34375 |
APEX exposure bias | −0.66666666666667 |
Maximum land aperture | 3.34375 APEX (f/3.19) |
Metering mode | Pattern |
Flash | Flash fired, compulsory flash firing, red-eye reduction mode |
Supported Flashpix version | 1 |
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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 | Manual exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Scene capture type | Portrait |
Supported Flashpix version | 1 |
Image width | 2,092 px |
Image height | 3,192 px |
Date metadata was last modified | 14:32, 31 March 2016 |
IIM version | 2 |