File:Helicoprion ferrieri fossil shark jaw, Brewster County TX.jpg
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Summary
[edit]DescriptionHelicoprion ferrieri fossil shark jaw, Brewster County TX.jpg |
Helicoprion ferrieri (Hay, 1907) fossil shark jaw from the Permian of Texas, USA (public display, FMNH PF 7445, Field Museum of Natural History, Chicago, Illinois, USA). This remarkable fossil is a symphyseal tooth whorl from the lower jaw of an edestoid shark. It is in fossiliferous limestone of the Decie Ranch Member of the Skinner Ranch Formation (Wolfcampian Series, lower Lower Permian) from Dugout Mountain, northern Brewster County, Glass Mountains, western Texas, USA. Sharks have a cartilaginous skeleton and mineralized, phosphatic teeth (as are all vertebrate teeth). Helicoprion is undoubtedly the oddest shark in geologic history (see reconstructions elsewhere in this photo album). The specimen shown here is described in Kelly & Zangerl (1976) - Helicoprion (Edestidae) in the Permian of West Texas. Journal of Paleontology 50: 992-994. Classification: Animalia, Chordata, Vertebrata, Chondrichthyes, Elasmobranchii, Eugeneodontida, Edestoidea, Agassizodontidae/Helicoprionidae |
Date | |
Source | Helicoprion ferrieri fossil shark jaw (Skinner Ranch Formation, Lower Permian; Dugout Mountain, northern Brewster County, western Texas, USA) 1 |
Author | James St. John |
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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/15149774827. It was reviewed on 26 September 2014 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
26 September 2014
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current | 02:51, 26 September 2014 | 2,635 × 1,818 (4.21 MB) | Tillman (talk | contribs) | Transferred from Flickr via Flickr2commons |
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Camera manufacturer | NIKON CORPORATION |
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Exposure time | 1/60 sec (0.016666666666667) |
F-number | f/5.3 |
Date and time of data generation | 11:38, 11 June 2010 |
Lens focal length | 75 mm |
Orientation | Normal |
Horizontal resolution | 300 dpi |
Vertical resolution | 300 dpi |
Software used | Adobe Photoshop CS2 Macintosh |
File change date and time | 19:10, 23 September 2014 |
Y and C positioning | Co-sited |
Exposure Program | Not defined |
Exif version | 2.21 |
Date and time of digitizing | 11:38, 11 June 2010 |
Meaning of each component |
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Image compression mode | 4 |
APEX exposure bias | 0 |
Maximum land aperture | 4.7 APEX (f/5.1) |
Metering mode | Pattern |
Light source | Unknown |
Flash | Flash fired, strobe return light detected, auto mode |
DateTime subseconds | 10 |
DateTimeOriginal subseconds | 10 |
DateTimeDigitized subseconds | 10 |
Supported Flashpix version | 1 |
Color space | sRGB |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Scene type | A directly photographed image |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Focal length in 35 mm film | 112 mm |
Scene capture type | Standard |
Scene control | None |
Contrast | Normal |
Saturation | Normal |
Sharpness | Normal |
Subject distance range | Unknown |
Supported Flashpix version | 1 |
Image width | 2,635 px |
Image height | 1,818 px |
Date metadata was last modified | 15:10, 23 September 2014 |