File:Boxwork veining in metatuffs (Cranberry Island Series, Upper Silurian, 424 Ma; Seawall Beach, Mt. Desert Island, Maine, USA) 2.jpg
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DescriptionBoxwork veining in metatuffs (Cranberry Island Series, Upper Silurian, 424 Ma; Seawall Beach, Mt. Desert Island, Maine, USA) 2.jpg |
English: Veins in rhyolitic metatuffs in the Silurian of Maine, USA.
The criss-crossing veins seen here look like they're composed of quartz (SiO2 - silica). Such vein networks are referred to as boxwork or stockwork. "Boxwork" is incorrectly asserted by some to be a cave feature only. The host rocks are part of a Upper Silurian volcanic succession called the Cranberry Island Series. It mostly consists of rhyolitic volcanic breccias, volcanic tuffs, and rhyolite lava flows. These are metamorphosed rhyolitic volcanic tuffs in the middle member of the series, which is the most voluminous of the three members. The dark orangish brown coloration is iron oxide staining. Stratigraphy: upper Middle Member, Cranberry Island Series, Upper Silurian, 424 Ma Locality: Seawall Beach, Acadia National Park, Mt. Desert Island, Maine, USA Some info. from: Seaman et al. (1995) - Volcanic expression of bimodal magmatism: the Cranberry Island-Cadillac Mountain complex, coastal Maine. Journal of Geology 103: 301-311. |
Date | |
Source | https://www.flickr.com/photos/47445767@N05/50084064307/ |
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@N05/50084064307. It was reviewed on 25 August 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
25 August 2020
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current | 06:13, 25 August 2020 | 3,008 × 2,000 (5.04 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/50084064307/ with UploadWizard |
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Camera manufacturer | NIKON CORPORATION |
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Camera model | NIKON D70s |
Exposure time | 1/125 sec (0.008) |
F-number | f/5.6 |
ISO speed rating | 200 |
Date and time of data generation | 16:16, 12 September 2006 |
Lens focal length | 70 mm |
Width | 3,008 px |
Height | 2,000 px |
Bits per component |
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Pixel composition | RGB |
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 | 03:04, 6 July 2020 |
Y and C positioning | Co-sited |
Exposure Program | Not defined |
Exif version | 2.21 |
Date and time of digitizing | 16:16, 12 September 2006 |
Meaning of each component |
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Image compression mode | 4 |
APEX shutter speed | 6.965784 |
APEX aperture | 4.970854 |
APEX exposure bias | 0 |
Maximum land aperture | 4.3 APEX (f/4.44) |
Metering mode | Pattern |
Light source | Unknown |
Flash | Flash did not fire |
DateTime subseconds | 70 |
DateTimeOriginal subseconds | 70 |
DateTimeDigitized subseconds | 70 |
Supported Flashpix version | 1 |
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 | 105 mm |
Scene capture type | Standard |
Scene control | None |
Contrast | Normal |
Saturation | Normal |
Sharpness | Normal |
Subject distance range | Unknown |
Serial number of camera | 1004a0cc |
Lens used | 18.0-70.0 mm f/3.5-4.5 |
Date metadata was last modified | 23:04, 5 July 2020 |
Unique ID of original document | 84B94B6A7C1A5AC4795FCBFD6C49075F |
IIM version | 32,767 |