File:Pseudorthoceras sp. (fossil cephalopod) (Lower Mercer Limestone, Middle Pennsylvanian; Rock Cut, Muskingum County, Ohio, USA) 2 (34332392696).jpg
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[edit]DescriptionPseudorthoceras sp. (fossil cephalopod) (Lower Mercer Limestone, Middle Pennsylvanian; Rock Cut, Muskingum County, Ohio, USA) 2 (34332392696).jpg |
Pseudorthoceras sp. - straight-shelled fossil nautiloid in fossiliferous limestone in the Pennsylvanian of Ohio, USA. Nautiloids are squid-like creatures that construct long and slightly tapering or coiled, aragonitic, hollow shells with regularly-spaced internal walls. In the fossil record, the original aragonite shell has usually dissolved away, leaving an internal mold (an impression of the shell's interior). Nautiloids were relatively common components of Paleozoic oceans. Most species had straight, slightly tapering shells, but some had loosely coiled or tightly coiled shells. The entire group is represented in today's oceans by five living species of chambered nautilus, all of which have a coiled shell: Nautilus pompilius, Nautilus macromphalus, Nautilus stenomphalus, Nautilus belauensis, and Allonautilus scrobiculatus. This photo depicts an internal mold of a Pseudorthoceras nautiloid, which had a fairly narrow, slightly tapering shell. Classification: Animalia, Mollusca, Cephalopoda, Nautiloidea (or Orthoceratoidea), Pseudorthocerida, Pseudorthoceratidae Stratigraphy: Lower Mercer Limestone, Pottsville Group, Atokan Stage, lower Middle Pennsylvanian Locality: Rock Cut railroad cut - large talus block along Ohio Central Railroad tracks (west of milepost 134), ~southwest of Copeland Island & south-southeast of the town of Dresden, northern Muskingum County, eastern Ohio, USA (~vicinity of 40° 04’ 24.41” North latitude, ~81° 59’ 11.25” West longitude) |
Date | |
Source | Pseudorthoceras sp. (fossil cephalopod) (Lower Mercer Limestone, Middle Pennsylvanian; Rock Cut, Muskingum County, Ohio, USA) 2 |
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@N05/34332392696. It was reviewed on 24 June 2017 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
24 June 2017
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 17:39, 24 June 2017 | 3,779 × 2,234 (7.23 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 | 1/100 sec (0.01) |
F-number | f/8 |
ISO speed rating | 80 |
Date and time of data generation | 12:11, 15 April 2017 |
Lens focal length | 6.2 mm |
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 | 23:23, 30 April 2017 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 12:11, 15 April 2017 |
Meaning of each component |
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Image compression mode | 3 |
APEX shutter speed | 6.65625 |
APEX aperture | 6 |
APEX exposure bias | −1.3333333333333 |
Maximum land aperture | 2.96875 APEX (f/2.8) |
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 | 19:23, 30 April 2017 |
Unique ID of original document | 264C28E5FDAA8428E90586403F513BA8 |