File:Quartzite & slate (Baraboo Quartzite, upper Paleoproterozoic, ~1.7 Ga; Van Hise Rock, just north of Rock Springs, Wisconsin, USA) 6 (45488895945).jpg
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editDescriptionQuartzite & slate (Baraboo Quartzite, upper Paleoproterozoic, ~1.7 Ga; Van Hise Rock, just north of Rock Springs, Wisconsin, USA) 6 (45488895945).jpg |
Quartzite & slate in the Precambrian of Wisconsin, USA. (photo by Mary Ellen St. John) The Baraboo Ranges of southern Wisconsin are dominated by a hard, erosion-resistant Precambrian metamorphic unit called the Baraboo Quartzite. These rocks were originally marine sandstones and have been subjected to metamorphism and structural folding. Original sedimentary structures are preserved, such as cross-bedding and ripple marks. Baraboo Quartzites vary in color from pinkish to dark reddish to grayish. During metamorphism, quartz overgrowths formed over the original quartz sand grains. Long-term, modern weathering can result in original sand grains being released. The large rock shown above is Van Hise Rock, which detached from a natural cliff of Baraboo Quartzite outcrop behind the photographer (the cliff has since been modified by road construction). The pinkish areas at right are quartzite. The dark gray areas at left are slate (often referred to as "phyllite" in the literature). Slate/phyllite interbeds (= originally shales) are somewhat common in certain intervals of the Baraboo Quartzite. Van Hise Rock has fallen such that the original sedimentary bedding is now vertical. The slanted layering in the slate at left is metamorphic foliation. This unit has economic significance - it has been quarried historically and in modern times. The quartzite is broken down into gravel-sized pieces for use as railroad ballast and erosion-control rip-rap. Stratigraphy: Baraboo Quartzite, upper Paleoproterozoic, ~1.7 Ga Locality: Van Hise Rock - large, cliff-detached block on the eastern side of Rt. 136, just north of the town of Rock Springs, North Range of the Baraboo Ranges, north-central Sauk County, southern Wisconsin, USA (43° 29’ 20.70” North latitude, 89° 54’ 56.57” West longitude) |
Date | |
Source | Quartzite & slate (Baraboo Quartzite, upper Paleoproterozoic, ~1.7 Ga; Van Hise Rock, just north of Rock Springs, Wisconsin, USA) 6 |
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@N05/45488895945. It was reviewed on 22 October 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
22 October 2019
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current | 05:42, 22 October 2019 | 3,000 × 4,000 (2.21 MB) | Rudolphous (talk | contribs) | Transferred from Flickr via #flickr2commons |
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Camera manufacturer | Canon |
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Camera model | Canon PowerShot SX40 HS |
Exposure time | 1/250 sec (0.004) |
F-number | f/4 |
ISO speed rating | 200 |
Date and time of data generation | 12:15, 3 June 2015 |
Lens focal length | 6.166 mm |
Orientation | Normal |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
Software used | Adobe Photoshop Elements 6.0 Windows |
File change date and time | 14:43, 10 December 2016 |
Y and C positioning | Co-sited |
Exif version | 2.3 |
Date and time of digitizing | 12:15, 3 June 2015 |
Meaning of each component |
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Image compression mode | 3 |
APEX shutter speed | 7.96875 |
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 | 16,393.442622951 |
Focal plane Y resolution | 16,393.442622951 |
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 |
Supported Flashpix version | 1 |
Image width | 3,000 px |
Image height | 4,000 px |
Rating (out of 5) | 0 |
Date metadata was last modified | 09:43, 10 December 2016 |
IIM version | 14,143 |