File:Helicoprion tooth whorl.jpg
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Summary
DescriptionHelicoprion tooth whorl.jpg |
English: Helicoprion sp. - fossil shark tooth whorl from the Permian of Idaho, USA. (public display, FHPR L2003-2, Utah Field House of Natural History, Vernal, Utah, USA)
This remarkable fossil is a symphyseal tooth whorl from the lower jaw of an edestoid shark. It is in fossiliferous limestone of the Permian-aged Phosphoria Formation in Idaho. Sharks have a cartilaginous skeleton and mineralized, phosphatic teeth (as are all vertebrate teeth). Helicoprion is undoubtedly the strangest shark in geologic history (see reconstructions elsewhere in this photo album). Some paleontologists have interpreted the tooth whorl of this shark as part of a coiled lower jaw that may have been whipped outward and back to capture fish prey. Although intriguing, this type of reconstruction is almost certainly incorrect. Instead of an external lower tooth whorl, the tooth whorl was likely internal. The latter interpretation is based on well-preserved specimens with soft-part preservation from Idaho Phosphoria Formation concretions. From museum signage: This stunning fossil is a shark tooth-whorl. A whorl is a spiral of teeth that Helicoprion sharks evolved 250 million years ago. This species of early shark may have been more than 10 feet long and used its unusual teeth to injure and disable prey. Classification: Animalia, Chordata, Vertebrata, Chondrichthyes, Elasmobranchii, Eugeneodontida, Edestoidea, Agassizodontidae/Helicoprionidae Stratigraphy: Phosphoria Formation (a.k.a. Park City Formation), Roadian Stage to Wordian Stage, mid-Permian Locality: unrecorded/undisclosed site in Idaho (likely southeastern Idaho), USA |
Date | |
Source | https://www.flickr.com/photos/jsjgeology/33484853213/ |
Author | James St. John |
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10 June 2012
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current | 06:36, 30 April 2017 | 2,622 × 2,548 (5.36 MB) | FunkMonk | User created page 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/3.2 |
ISO speed rating | 80 |
Date and time of data generation | 10:18, 10 June 2012 |
Lens focal length | 8.295 mm |
Image title | |
Width | 4,000 px |
Height | 3,000 px |
Bits per component |
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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 | 00:22, 27 April 2017 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 10:18, 10 June 2012 |
Meaning of each component |
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Image compression mode | 3 |
APEX shutter speed | 5.90625 |
APEX aperture | 3.34375 |
APEX exposure bias | -0.33333333333333 |
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 |
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 | 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 | 20:22, 26 April 2017 |
Unique ID of original document | FE545B3CFFC0C594FE569025A0119B30 |