File:Fossil shark tooth (Sanders Group, Mississippian; Henderson Creek roadcut, Lawrence County, Indiana, USA) 1 (34916012175).jpg
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[edit]DescriptionFossil shark tooth (Sanders Group, Mississippian; Henderson Creek roadcut, Lawrence County, Indiana, USA) 1 (34916012175).jpg |
Fossil shark tooth from the Mississippian of Indiana, 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”. Seen here is the occlusal surface of a shell-crushing tooth from a fossil shark - probably Helodus. Classification: Animalia, Chordata, Vertebrata, Chondrichthyes, Euchondrocephali, Helodontidae Stratigraphy: float from the Ramp Creek Formation (middle Sanders Group, upper Osagean Stage, lower Malmeyeran Series, upper Lower Mississippian) or the Harrodsburg Limestone (middle Sanders Group, upper Osagean Stage to lower Meramecian Stage, middle Valmeyeran Series, upper Lower Mississippian to lower Middle Mississippian) Locality: talus from the base of a roadcut along Rt. 446, just south of Henderson Creek, due west of Norman Station, just east of due north of Heltonville (NE1/4 of section 14, T6N, R1E, Norman Quadrangle), central Pleasant Run Township, northeastern Lawrence County, south-central Indiana, USA |
Date | |
Source | Fossil shark tooth (Sanders Group, Mississippian; Henderson Creek roadcut, Lawrence County, Indiana, USA) 1 |
Author | James St. John |
Licensing
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/34916012175 (archive). It was reviewed on 7 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
7 December 2019
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 18:06, 7 December 2019 | 1,613 × 1,222 (1.34 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 | 1/60 sec (0.016666666666667) |
F-number | f/11 |
ISO speed rating | 80 |
Date and time of data generation | 14:23, 26 May 2017 |
Lens focal length | 11.614 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 | 21:33, 26 May 2017 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 14:23, 26 May 2017 |
Meaning of each component |
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Image compression mode | 3 |
APEX shutter speed | 5.90625 |
APEX aperture | 6.90625 |
APEX exposure bias | −0.66666666666667 |
Maximum land aperture | 4 APEX (f/4) |
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 | 17:33, 26 May 2017 |
Unique ID of original document | 6A2F48438D92C5F27389BAA9CE5270C0 |
IIM version | 1 |