File:Olenellus sp. (fossil trilobite) (Pioche Formation, Lower Cambrian; Ruin Wash, Chief Range, Nevada, USA).jpg
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[edit]DescriptionOlenellus sp. (fossil trilobite) (Pioche Formation, Lower Cambrian; Ruin Wash, Chief Range, Nevada, USA).jpg |
English: Olenellus sp. - fossil trilobite cephalon in mudrock from the Cambrian of Nevada, USA.
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). Seen here is an olenellid trilobite cephalon from the Chief Range in Nevada. The specimen comes from a Cambrian soft-bodied fossil deposit called the Ruin Wash Lagerstätte. Within five minutes of my arrival at this site, I found an anomalocaridid feeding appendage. Classification: Animalia, Arthropoda, Trilobita, Polymerida, Redlichiida, Olenellina, Olenellidae Stratigraphy: Ruin Wash Lagerstätte, lower C-Shale Member, Pioche Formation, just below the olenelloid trilobite extinction event, ~uppermost Bonnia-Olenellus zone, uppermost Dyeran Stage, uppermost Lower Cambrian Locality: ICS locality 1044, pit from along-strike fossil quarries, adjacent to Ruin Wash, western side of the Chief Range, south of Bennett Pass & north of Klondike Pass, 121 mm N & 205 mm E of the SW corner of the Bennett Pass, Nevada 7.5' topographic quadrangle map, northeast-central Lincoln County, southeastern Nevada, USA (vicinity of 37˚ 46.647' North latitude, 114˚ 34.247' West longitude) |
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Source | https://www.flickr.com/photos/47445767@N05/49062985996/ |
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@N05/49062985996. 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 | 01:54, 13 October 2020 | ![]() | 2,588 × 2,175 (4.62 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/49062985996/ with UploadWizard |
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Camera manufacturer | Canon |
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Camera model | Canon PowerShot D10 |
Exposure time | 1/30 sec (0.033333333333333) |
F-number | f/4 |
ISO speed rating | 80 |
Date and time of data generation | 21:59, 12 November 2019 |
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 16.0 (Macintosh) |
File change date and time | 23:50, 13 November 2019 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 21:59, 12 November 2019 |
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Image compression mode | 3 |
APEX shutter speed | 4.90625 |
APEX aperture | 4 |
APEX exposure bias | −1.6666666666667 |
Maximum land aperture | 4 APEX (f/4) |
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Flash | Flash did not fire, compulsory flash suppression |
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File source | Digital still camera |
Custom image processing | Normal process |
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White balance | Auto white balance |
Digital zoom ratio | 1 |
Scene capture type | Portrait |
Lens used | 6.2-18.6 mm |
Date metadata was last modified | 18:50, 13 November 2019 |
Unique ID of original document | 6658751E62F40DA3376A6A52D4102782 |