File:Elrathia kingii (fossil trilobites).jpg
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Summary[edit]
DescriptionElrathia kingii (fossil trilobites).jpg |
English: Elrathia kingii (Meek, 1870) - fossil trilobites from the Cambrian of Utah, USA.
Trilobites are extinct marine arthropods that occur in the Cambrian to Permian stratigraphic record. They are most common in Cambrian rocks. The group goes extinct at the Permian-Triassic mass extinction event (251 million years ago). Trilobites have a tripartite skeleton both transversely and longitudinally. They have a head (cephalon), a body of many segments (thorax), and a tail (pygidium) (in the fossil shown here, the head is at the upper right & the tail is at lower left). During life, the trilobite animal had antennae and legs and gills and guts and other soft parts. The preserved portion of a trilobite fossil is the hard, calcitic exoskeleton that covered the soft anatomy. During molting or after death, the multipart exoskeleton separates into many pieces. Complete, articulated fossil trilobites are uncommon to rare. The trilobites seen here are Elrathia kingii, one of the most abundantly preserved trilobite species on Earth. These are affectionately called "Joe Trilobites" by trilobite researchers, in reference to their abundance and unremarkable skeletal morphology (i.e., no spines or unusual features). Classification: Arthropoda, Trilobita, Polymerida, Alokistocaridae Stratigraphy & age: upper Ptychagnostus atavus Interval-zone (= lower Bolaspidella Assemblage-zone), Wheeler Formation, upper Middle Cambrian Locality: House Range, northern Millard County, western Utah, USA |
Date | |
Source | https://www.flickr.com/photos/jsjgeology/46866936382/ |
Author | James St. John |
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Camera manufacturer | Canon |
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F-number | f/9 |
ISO speed rating | 80 |
Date and time of data generation | 09:27, 23 January 2019 |
Lens focal length | 8.295 mm |
Image title | |
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 13.0 (Macintosh) |
File change date and time | 12:35, 29 January 2019 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 09:27, 23 January 2019 |
Meaning of each component |
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Image compression mode | 3 |
APEX shutter speed | 5.90625 |
APEX aperture | 6.34375 |
APEX exposure bias | −0.66666666666667 |
Maximum land aperture | 3.34375 APEX (f/3.19) |
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Flash | Flash fired, compulsory flash firing, red-eye reduction mode |
Supported Flashpix version | 1 |
Color space | sRGB |
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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 |
Lens used | 6.2-18.6 mm |
Date metadata was last modified | 07:35, 29 January 2019 |
Unique ID of original document | C5A62146DBB7C3AD230853755F1FB0D9 |
IIM version | 18,755 |