File:Asymmetrical ripple marks in quartzite (Baraboo Quartzite, upper Paleoproterozoic, ~1.7 Ga; southern shore of Devil's Lake, Devil's Lake State Park, Wisconsin, USA) 3 (18200165874).jpg
![File:Asymmetrical ripple marks in quartzite (Baraboo Quartzite, upper Paleoproterozoic, ~1.7 Ga; southern shore of Devil's Lake, Devil's Lake State Park, Wisconsin, USA) 3 (18200165874).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/9/95/Asymmetrical_ripple_marks_in_quartzite_%28Baraboo_Quartzite%2C_upper_Paleoproterozoic%2C_~1.7_Ga%3B_southern_shore_of_Devil%27s_Lake%2C_Devil%27s_Lake_State_Park%2C_Wisconsin%2C_USA%29_3_%2818200165874%29.jpg/800px-thumbnail.jpg?20191022054543)
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[edit]DescriptionAsymmetrical ripple marks in quartzite (Baraboo Quartzite, upper Paleoproterozoic, ~1.7 Ga; southern shore of Devil's Lake, Devil's Lake State Park, Wisconsin, USA) 3 (18200165874).jpg |
Asymmetrical ripple marks in quartzite in the Precambrian of Wisconsin, USA. 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. 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. The ridges on the rock shown above are asymmetrical ripples. Asymmetrical ripple marks have a long side and a short side, when viewed in cross-section. They form in a one-directional current by wind or water (in this case, water). The current direction was toward the short side of each ripple. Stratigraphy: Baraboo Quartzite, upper Paleoproterozoic, ~1.7 Ga Locality: loose block along the southern shore of Devil's Lake, Devil's Lake State Park, northern part of the South Range of the Baraboo Ranges, southeast of the town of Baraboo, eastern Sauk County, southern Wisconsin, USA |
Date | |
Source | Asymmetrical ripple marks in quartzite (Baraboo Quartzite, upper Paleoproterozoic, ~1.7 Ga; southern shore of Devil's Lake, Devil's Lake State Park, Wisconsin, USA) 3 |
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@N05/18200165874 (archive). 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 | 05:45, 22 October 2019 | ![]() | 4,000 × 3,000 (4.15 MB) | Rudolphous (talk | contribs) | Transferred from Flickr via #flickr2commons |
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ISO speed rating | 80 |
Date and time of data generation | 14:54, 3 June 2015 |
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Image title | |
Width | 4,000 px |
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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 13.0 (Macintosh) |
File change date and time | 01:22, 15 June 2015 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 14:54, 3 June 2015 |
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APEX aperture | 6 |
APEX exposure bias | −0.33333333333333 |
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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 | 21:22, 14 June 2015 |
Unique ID of original document | 5EB18C19496981C7D97048FA7ECD24CE |