File:Elephant Rock (Aztec Sandstone, Upper Triassic to Lower Jurassic; Valley of Fire, Nevada, USA) 8 (49673774257).jpg
Original file (2,592 × 1,544 pixels, file size: 2.66 MB, MIME type: image/jpeg)
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Summary[edit]
DescriptionElephant Rock (Aztec Sandstone, Upper Triassic to Lower Jurassic; Valley of Fire, Nevada, USA) 8 (49673774257).jpg |
Differentially weathered sandstones in the Mesozoic of Nevada, USA. The Aztec Sandstone is a widespread quartzose sandstone lithofacies in the lower Mesozoic of America's Southwest. It is Late Triassic to Early Jurassic in age and equivalent to the Navajo Sandstone, the Nugget Sandstone, and the Glen Canyon Sandstone (I wish they'd have one name only). The Aztec/Navajo/Nugget/Glen Canyon is an ancient eolian sand dune deposit. Vast "seas" of wind-blown sand dunes are called "ergs". The Sahara Desert in northern Africa is a modern example. This photo shows the Aztec Sandstone at Valley of Fire in southeastern Nevada. The reddish color is from hematite (Fe2O3, iron oxide), which is natural "rust". Hematitic siliciclastic sedimentary rocks (sandstones, siltstones, shale) are called "redbeds". They first appear in the upper Paleoproterozoic stratigraphic record, about 1.8 billion years ago. This corresponds to times when Earth's atmosphere starting accumulating significant levels of free oxygen gas (O2). Earth's earliest air lacked free oxygen. |
Date | Taken on 6 July 2010, 14:24 |
Source | Elephant Rock (Aztec Sandstone, Upper Triassic to Lower Jurassic; Valley of Fire, Nevada, USA) 8 |
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@N05/49673774257. It was reviewed on 14 April 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
14 April 2020
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current | 18:12, 14 April 2020 | 2,592 × 1,544 (2.66 MB) | Poldavia (talk | contribs) | Transferred from Flickr via #flickr2commons |
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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 | Canon |
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Camera model | Canon PowerShot S2 IS |
Exposure time | 1/800 sec (0.00125) |
F-number | f/4 |
ISO speed rating | 50 |
Date and time of data generation | 14:24, 6 July 2010 |
Lens focal length | 10.6 mm |
Width | 2,592 px |
Height | 1,944 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 16.0 (Macintosh) |
File change date and time | 01:48, 18 March 2020 |
Y and C positioning | Centered |
Exif version | 2.2 |
Date and time of digitizing | 14:24, 6 July 2010 |
Meaning of each component |
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Image compression mode | 3 |
APEX shutter speed | 9.65625 |
APEX aperture | 4 |
APEX exposure bias | 0 |
Maximum land aperture | 3.34375 APEX (f/3.19) |
Metering mode | Pattern |
Flash | Flash did not fire, compulsory flash suppression |
Supported Flashpix version | 1 |
Color space | sRGB |
Focal plane X resolution | 11,520 |
Focal plane Y resolution | 11,571.428571429 |
Focal plane resolution unit | inches |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Scene capture type | Standard |
Lens used | 6.0-72.0 mm |
Date metadata was last modified | 21:48, 17 March 2020 |
Unique ID of original document | 7F1018AC0E01E9CCDF0CE090BAD2DD48 |