File:Emperoceras sp. (fossil heteromorph ammonite) (Late Cretaceous) (32180949494).jpg
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DescriptionEmperoceras sp. (fossil heteromorph ammonite) (Late Cretaceous) (32180949494).jpg |
Emperoceras sp. - fossil ammonite (CM 33061, Carnegie Museum of Natural History, Pittsburgh, Pennsylvania, USA) This genus is considered by some to be a junior subjective synonym of Didymoceras. Ammonites are common & conspicuous fossils in Mesozoic marine sedimentary rocks. Ammonites are an extinct group of cephalopods - they’re basically squids in coiled shells. The living chambered nautilus also has a squid-in-a-coiled-shell body plan, but ammonites are a different group. Ammonites get their name from the coiled shell shape being reminiscent of a ram’s horn. The ancient Egyptian god Amun (“Ammon” in Greek) was often depicted with a ram’s head & horns. Pliny’s Natural History, book 37, written in the 70s A.D., refers to these fossils as “Hammonis cornu” (the horn of Ammon), and mentions that people living in northeastern Africa perceived them as sacred. Pliny also indicates that ammonites were often pyritized. Ammonites typically have a planispirally coiled, calcareous shell. The fossil shown above has a bizarre and irregularly shaped shell. Such examples are called heteromorph ammonites. Classification: Animalia, Mollusca, Cephalopoda, Ammonoidea, Ancyloceratina, Nostoceratidae See info. at: <a href="https://en.wikipedia.org/wiki/Didymoceras" rel="nofollow">en.wikipedia.org/wiki/Didymoceras</a> and <a href="https://en.wikipedia.org/wiki/Ancyloceratina" rel="nofollow">en.wikipedia.org/wiki/Ancyloceratina</a> |
Date | |
Source | Emperoceras sp. (fossil heteromorph ammonite) (Late Cretaceous) |
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@N05/32180949494 (archive). It was reviewed on 1 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
1 December 2019
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current | 08:59, 1 December 2019 | 1,740 × 1,905 (2.6 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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Camera manufacturer | Canon |
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Camera model | Canon PowerShot D10 |
Exposure time | 1/80 sec (0.0125) |
F-number | f/4 |
ISO speed rating | 320 |
Date and time of data generation | 16:21, 30 January 2011 |
Lens focal length | 11.614 mm |
Orientation | Normal |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
Software used | Adobe Photoshop CS2 Macintosh |
File change date and time | 22:49, 20 February 2017 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 16:21, 30 January 2011 |
Meaning of each component |
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Image compression mode | 3 |
APEX shutter speed | 6.3125 |
APEX aperture | 4 |
APEX exposure bias | 0 |
Maximum land aperture | 4 APEX (f/4) |
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 |
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 | Auto exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Scene capture type | Standard |
Supported Flashpix version | 1 |
Image width | 1,740 px |
Image height | 1,905 px |
Date metadata was last modified | 17:49, 20 February 2017 |
IIM version | 2 |