File:Oolitic Sand from Pyramid Lake in Washoe County in Nevada USA.jpg
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Summary[edit]
DescriptionOolitic Sand from Pyramid Lake in Washoe County in Nevada USA.jpg |
English: Oolitic sand from the Holocene deposits of Pyramid Lake in Washoe County, Nevada, USA. (Public display, Geology Department, Wittenberg University, Springfield, Ohio, USA).
Oolites are sand-sized (1/16 mm to 2 mm in size), well rounded, concentrically-layered calcite or aragonite grains (they are also known as ooliths and ooids). Oolites form by rolling back and forth on a shallow seafloor, or sometimes on a shallow lake bed, by wave action. Oolites are forming today on the Bahamas Platform and in Great Salt Lake, Utah, USA. Ancient, solidified deposits of oolites are called oolitic limestones. Uncertainty exists about the specifics of the origin of oolites. Some researchers conclude that oolites form by completely inorganic chemical precipitation of CaCO3 from water around some nucleus (a tiny shell or skeletal fragment or sediment grain). Other researchers conclude that the presence of bacterial films on oolite grain surfaces play a significant role in the precipitation of CaCO3 layers. However, the undoubted presence of bacteria does not necessarily indicate a biogenic origin for oolites - bacteria are everywhere. |
Date | |
Source | https://www.flickr.com/photos/jsjgeology/27392574117/ |
Author | James St. John (https://www.flickr.com/people/jsjgeology/ |
Licensing[edit]
This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/27392574117 (archive). It was reviewed on 25 May 2018 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
25 May 2018
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current | 20:09, 25 May 2018 | 2,838 × 2,565 (4.15 MB) | GeoWriter (talk | contribs) | 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/13 |
ISO speed rating | 80 |
Date and time of data generation | 15:55, 24 March 2018 |
Lens focal length | 14.303 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 | 22:46, 20 May 2018 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 15:55, 24 March 2018 |
Meaning of each component |
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Image compression mode | 3 |
APEX shutter speed | 5.90625 |
APEX aperture | 7.40625 |
APEX exposure bias | −0.66666666666667 |
Maximum land aperture | 4.34375 APEX (f/4.51) |
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 | 18:46, 20 May 2018 |
Unique ID of original document | 2D5B9CC2172FD3A29927CBCC4C5849E5 |
IIM version | 29,735 |