File:Porphyritic phonolite (Eocene, 49 Ma; Devils Tower, northeastern Wyoming, USA) 2.jpg
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![File:Porphyritic phonolite (Eocene, 49 Ma; Devils Tower, northeastern Wyoming, USA) 2.jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/b/b7/Porphyritic_phonolite_%28Eocene%2C_49_Ma%3B_Devils_Tower%2C_northeastern_Wyoming%2C_USA%29_2.jpg/522px-Porphyritic_phonolite_%28Eocene%2C_49_Ma%3B_Devils_Tower%2C_northeastern_Wyoming%2C_USA%29_2.jpg?20191219014821)
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[edit]DescriptionPorphyritic phonolite (Eocene, 49 Ma; Devils Tower, northeastern Wyoming, USA) 2.jpg |
English: The principal scenery at America's first national monument in northeastern Wyoming is a distinctive igneous feature called Devils Tower. It has been variously interpreted as a volcanic neck (probable), an eroded laccolith (unlikely), or an eroded stock (possible). The vertical to subvertical striations along the sides of Devils Tower represent columnar jointing, formed as the original molten rock cooled and contracted. Devils Tower is one of three classic localities on Earth that have excellent columnar jointing - the other sites are Devils Postpile in California and Giants Causeway in Ireland. The rocks of Devils Tower are 49 million year old porphyritic phonolites, formed during the Eocene.
Locality: Tower Trail, Devils Tower National Monument, northeastern Wyoming, USA |
Date | |
Source | https://www.flickr.com/photos/47445767@N05/15900729432/ |
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@N05/15900729432 (archive). It was reviewed on 19 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
19 December 2019
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 01:48, 19 December 2019 | ![]() | 1,995 × 2,289 (2.44 MB) | Ser Amantio di Nicolao (talk | contribs) | User created page with UploadWizard |
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Camera manufacturer | NIKON CORPORATION |
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Camera model | NIKON D70s |
Exposure time | 1/400 sec (0.0025) |
F-number | f/8 |
ISO speed rating | 400 |
Date and time of data generation | 15:04, 15 August 2010 |
Lens focal length | 18 mm |
Orientation | Normal |
Horizontal resolution | 72 dpi |
Vertical resolution | 72 dpi |
Software used | Adobe Photoshop CS2 Macintosh |
File change date and time | 18:50, 28 November 2014 |
Exposure Program | Not defined |
Exif version | 2.2 |
Date and time of digitizing | 15:04, 15 August 2010 |
Image compression mode | 4 |
APEX exposure bias | 0 |
Maximum land aperture | 3.6 APEX (f/3.48) |
Metering mode | Pattern |
Light source | Unknown |
Flash | Flash did not fire |
DateTime subseconds | 80 |
DateTimeOriginal subseconds | 80 |
DateTimeDigitized subseconds | 80 |
Supported Flashpix version | 1 |
Color space | sRGB |
Sensing method | One-chip color area sensor |
Custom image processing | Normal process |
Exposure mode | Auto exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Focal length in 35 mm film | 27 mm |
Scene capture type | Standard |
Contrast | Normal |
Saturation | Normal |
Sharpness | Normal |
Subject distance range | Unknown |
Supported Flashpix version | 1 |
Image width | 1,995 px |
Image height | 2,289 px |
Date metadata was last modified | 13:50, 28 November 2014 |