File:Harrisoceras rectum fossil nautiloid (Silurian; Wyandot County, northern Ohio, USA).jpg
Original file (2,752 × 1,186 pixels, file size: 3.47 MB, MIME type: image/jpeg)
Captions
Summary
editDescriptionHarrisoceras rectum fossil nautiloid (Silurian; Wyandot County, northern Ohio, USA).jpg |
English: Harrisoceras rectum - internal mold of a straight-shelled nautiloid, preserved in dolostone from the Silurian of Ohio, USA. (public display, Orton Geology Museum, Ohio State University, Columbus, 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. In the above photo, the thin whitish lines in the center and right portions of this Harrisoceras rectum fossil nautiloid are sutures, marking the intersection of internal walls (septa) and the external shell. The left portion of the fossil lacks sutures - that’s the living chamber where the squid animal was located. Classification: Animalia, Mollusca, Cephalopoda, Nautiloidea, Orthocerida, Geisonoceratidae Stratigraphy: unrecorded unit in the Silurian Locality: unspecified location in Wyandot County, northern Ohio, USA |
Date | |
Source | https://www.flickr.com/photos/47445767@N05/15218529696/ |
Author | James St. John |
Licensing
edit- You are free:
- to share – to copy, distribute and transmit the work
- to remix – to adapt the work
- Under the following conditions:
- attribution – You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/15218529696. It was reviewed on 20 October 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
20 October 2020
File history
Click on a date/time to view the file as it appeared at that time.
Date/Time | Thumbnail | Dimensions | User | Comment | |
---|---|---|---|---|---|
current | 19:29, 20 October 2020 | 2,752 × 1,186 (3.47 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/15218529696/ with UploadWizard |
You cannot overwrite this file.
File usage on Commons
There are no pages that use this file.
Metadata
This file contains additional information such as Exif metadata which may have been added by the digital camera, scanner, or software program used to create or digitize it. If the file has been modified from its original state, some details such as the timestamp may not fully reflect those of the original file. The timestamp is only as accurate as the clock in the camera, and it may be completely wrong.
Camera manufacturer | NIKON CORPORATION |
---|---|
Camera model | NIKON D70s |
Exposure time | 1/60 sec (0.016666666666667) |
F-number | f/4.8 |
Date and time of data generation | 15:13, 13 August 2007 |
Lens focal length | 52 mm |
Orientation | Normal |
Horizontal resolution | 300 dpi |
Vertical resolution | 300 dpi |
Software used | Adobe Photoshop CS2 Macintosh |
File change date and time | 19:51, 14 September 2014 |
Y and C positioning | Co-sited |
Exposure Program | Not defined |
Exif version | 2.21 |
Date and time of digitizing | 15:13, 13 August 2007 |
Meaning of each component |
|
Image compression mode | 4 |
APEX exposure bias | 0 |
Maximum land aperture | 4.5 APEX (f/4.76) |
Metering mode | Pattern |
Light source | Unknown |
Flash | Flash fired, strobe return light detected, auto mode |
DateTime subseconds | 00 |
DateTimeOriginal subseconds | 00 |
DateTimeDigitized subseconds | 00 |
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 | 78 mm |
Scene capture type | Standard |
Scene control | Low gain up |
Contrast | Normal |
Saturation | Normal |
Sharpness | Normal |
Subject distance range | Unknown |
Supported Flashpix version | 1 |
Image width | 2,752 px |
Image height | 1,186 px |
Date metadata was last modified | 15:51, 14 September 2014 |