File:Porphyritic phonolite (Shonkin Sag Laccolith, Early Eocene, 50-53 Ma; Buck Ranch, Highwood Mountains, Montana, USA) 1 (49061149591).jpg
![File:Porphyritic phonolite (Shonkin Sag Laccolith, Early Eocene, 50-53 Ma; Buck Ranch, Highwood Mountains, Montana, USA) 1 (49061149591).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/c/cc/Porphyritic_phonolite_%28Shonkin_Sag_Laccolith%2C_Early_Eocene%2C_50-53_Ma%3B_Buck_Ranch%2C_Highwood_Mountains%2C_Montana%2C_USA%29_1_%2849061149591%29.jpg/800px-Porphyritic_phonolite_%28Shonkin_Sag_Laccolith%2C_Early_Eocene%2C_50-53_Ma%3B_Buck_Ranch%2C_Highwood_Mountains%2C_Montana%2C_USA%29_1_%2849061149591%29.jpg?20191206020532)
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[edit]DescriptionPorphyritic phonolite (Shonkin Sag Laccolith, Early Eocene, 50-53 Ma; Buck Ranch, Highwood Mountains, Montana, USA) 1 (49061149591).jpg |
Porphyritic phonolite from the Eocene of Montana, USA. Phonolite is a highly alkaline, intermediate to mafic, finely-crystalline, extrusive igneous rock - it is a scarce type of volcanic lava. This sample is a porphyritic phonolite and is intrusive in origin - it's from a laccolith in Montana. Its phenocrysts include salite pyroxene (a type of diopside), pseudoleucite, olivine, phlogopite mica, and apatite. The finely-crystalline groundmass is composed of pseudoleucite, olivine, salite, sanidine, biotite, titanomagnetite, apatite, zeolites, and minor carbonate. Geologic unit & age: Shonkin Sag Laccolith, Ypresian Stage, Early Eocene, 50-53 Ma Locality: Buck Ranch, ~3.0 miles south-southwest of Geraldine, northeastern flank of the Highwood Mountains, southern Choteau County, northern Montana, USA |
Date | |
Source | Porphyritic phonolite (Shonkin Sag Laccolith, Early Eocene, 50-53 Ma; Buck Ranch, Highwood Mountains, Montana, USA) 1 |
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@N05/49061149591 (archive). It was reviewed on 6 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
6 December 2019
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current | 02:05, 6 December 2019 | ![]() | 3,295 × 2,313 (5.33 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 | 1/60 sec (0.016666666666667) |
F-number | f/9 |
ISO speed rating | 80 |
Date and time of data generation | 12:22, 12 November 2019 |
Lens focal length | 8.295 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 16.0 (Macintosh) |
File change date and time | 15:05, 13 November 2019 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 12:22, 12 November 2019 |
Meaning of each component |
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Image compression mode | 3 |
APEX shutter speed | 5.90625 |
APEX aperture | 6.34375 |
APEX exposure bias | −0.66666666666667 |
Maximum land aperture | 3.34375 APEX (f/3.19) |
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 | 10:05, 13 November 2019 |
Unique ID of original document | 7C65B41F5C9C489F6EF92F44647EEA5D |