File:Shark tooth (Fort Payne Formation, Lower Mississippian; Burkesville West Rt. 90 roadcut, Kentucky, USA) 1 (41378628505).jpg
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Summary
[edit]DescriptionShark tooth (Fort Payne Formation, Lower Mississippian; Burkesville West Rt. 90 roadcut, Kentucky, USA) 1 (41378628505).jpg |
Fossil shark tooth from the Mississippian of Kentucky, USA. The oldest known fish bones are fragments from the Upper Cambrian. Soft-bodied chordates referred to as “vertebrates” or “fish” are known from the Lower Cambrian and Middle Cambrian. The earliest, decent fossils of true fish are in the Ordovician. These remains show that the first fish lacked jaws. The evolution of jaws involved morphologic modification of the anterior pairs of gill arches. By the Devonian, jawed fishes had diversified into many distinct groups and became an important component of ancient oceans. The Devonian is often nicknamed “The Age of Fishes”. Shown above is the occlusal surface of a shell-crushing tooth from a fossil shark - possibly Helodus. It is composed of blackish-colored apatite (calcium phosphate). Classification: Animalia, Chordata, Vertebrata, Chondrichthyes, Euchondrocephali, Helodontidae (?) Stratigraphy: Fort Payne Formation, Osagean Stage, upper Lower Mississippian Locality: roadcut on the southern side of Route 90, just west of Burkesville, Kentucky, USA (36° 47’ 58.30” North latitude, 85° 22’ 58.20” West longitude) |
Date | |
Source | Shark tooth (Fort Payne Formation, Lower Mississippian; Burkesville West Rt. 90 roadcut, Kentucky, USA) 1 |
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@N05/41378628505 (archive). It was reviewed on 12 October 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
12 October 2019
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 04:04, 12 October 2019 | 3,761 × 2,623 (5.44 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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Metadata
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Camera manufacturer | Canon |
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Camera model | Canon PowerShot D10 |
Exposure time | 1/320 sec (0.003125) |
F-number | f/2.8 |
ISO speed rating | 80 |
Date and time of data generation | 16:59, 13 March 2018 |
Lens focal length | 6.2 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 | 00:02, 22 May 2018 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 16:59, 13 March 2018 |
Meaning of each component |
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Image compression mode | 3 |
APEX shutter speed | 8.3125 |
APEX aperture | 2.96875 |
APEX exposure bias | −0.66666666666667 |
Maximum land aperture | 2.96875 APEX (f/2.8) |
Metering mode | Pattern |
Flash | Flash did not fire, auto 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 | 20:02, 21 May 2018 |
Unique ID of original document | 7D0912228442BB7116A55B2A8BC24A79 |