File:Phlogopite-actinolite schist (Precambrian; near Custer, South Dakota, USA) 1 (49155293918).jpg
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Summary
[edit]DescriptionPhlogopite-actinolite schist (Precambrian; near Custer, South Dakota, USA) 1 (49155293918).jpg |
Tourmaline schist from the Precambrian of South Dakota, USA. (public display, South Dakota School of Mines Museum of Geology, Rapid City, South Dakota, USA) Brown = phlogopite mica Pale green = actinolite Schist is a foliated, intermediate- to high-grade metamorphic rock. Most examples are dominated by mica. This example has phlogopite mica and actinolite amphibole. The rock comes from Precambrian basement rocks in South Dakota's Black Hills, a large dome that was uplifted during the Laramide Orogeny (late Mesozoic to early Cenozoic). The Black Hills are the easternmost Laramide uplift in America's Cordillera. The original Phanerozoic sedimentary cover has been eroded away and is now only exposed in the margins of the Black Hills Uplift. The core of the Black Hills is a complex mix of mostly metamorphic and igneous rocks. The area includes several famous gold mines. Locality: unrecorded/undisclosed site near the town of Custer, Black Hills, western South Dakota, USA |
Date | |
Source | Phlogopite-actinolite schist (Precambrian; near Custer, South Dakota, 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@N05/49155293918 (archive). It was reviewed on 2 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
2 December 2019
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current | 06:24, 2 December 2019 | 2,934 × 2,000 (5.38 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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Date and time of data generation | 12:09, 18 August 2010 |
Lens focal length | 90 mm |
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Bits per component |
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Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 300 dpi |
Vertical resolution | 300 dpi |
Software used | Adobe Photoshop Elements 16.0 (Macintosh) |
File change date and time | 22:54, 1 December 2019 |
Y and C positioning | Co-sited |
Exposure Program | Not defined |
Exif version | 2.21 |
Date and time of digitizing | 12:09, 18 August 2010 |
Meaning of each component |
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APEX shutter speed | 5.906891 |
APEX aperture | 4.811985 |
APEX exposure bias | 0 |
Maximum land aperture | 4.8 APEX (f/5.28) |
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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 | 135 mm |
Scene capture type | Standard |
Scene control | None |
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Saturation | Normal |
Sharpness | Normal |
Subject distance range | Unknown |
Serial number of camera | 200638ad |
Lens used | 18.0-200.0 mm f/3.5-5.6 |
Date metadata was last modified | 17:54, 1 December 2019 |
Unique ID of original document | 537C0BDA4A5EBDFA171C7560E0D12367 |