File:Interbedded metagraywacke-slate (Lake Vermilion Formation, Neoarchean, 2.695-2.722 Ga; Pike River Bridge outcrop, just north of Peyla, Minnesota, USA) 2 (21601838842).jpg
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[edit]DescriptionInterbedded metagraywacke-slate (Lake Vermilion Formation, Neoarchean, 2.695-2.722 Ga; Pike River Bridge outcrop, just north of Peyla, Minnesota, USA) 2 (21601838842).jpg |
Turbidites (interbedded metagraywacke and slate) in the Precambrian of Minnesota, USA. Whitish-gray layers = metagraywacke Dark gray layers = slate The Lake Vermilion Formation is a Precambrian stratigraphic unit in northeastern Minnesota, USA. It consists of low-grade metamorphosed volcaniclastic sedimentary rocks that were deposited in a moderately deep water marine environment. The outcrop shown above is a Pleistocene-glaciated knob of Lake Vermilion Formation turbidites, which consist of interbedded graywackes ("dirty sandstones") and shales - these have since been metamorphosed to metagraywackes and slates. Turbidites are deposits laid down by turbidity currents - underwater sediment slides. Such slides commonly occur in continental slope settings. Turbidity current deposits typically accumulate in the continental rise, at the base of the slope. Turbidites consist principally of interbedded coarse-grained and fine-grained siliciclastic sedimentary rocks that show graded bedding, climbing ripple cross-stratification, flame structures, flute casts, and soft-sediment deformation. Note that a small-scale fault (middle of photo) has slightly offset the layers. The ridges at left are silicified joints. Stratigraphy: Lake Vermilion Formation, Neoarchean, 2.695-2.722 Ga Locality: Pike River Bridge Outcrop - glaciated low outcrop on the western side of County Road 77, immediately north of bridge over the Pike River, just north of the town of Peyla, north-central St. Louis County, Minnesota, USA (47° 47’ 30.89” North, 92° 22’ 07.68” West) |
Date | |
Source | Interbedded metagraywacke-slate (Lake Vermilion Formation, Neoarchean, 2.695-2.722 Ga; Pike River Bridge outcrop, just north of Peyla, Minnesota, USA) 2 |
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@N05/21601838842 (archive). It was reviewed on 5 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
5 December 2019
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current | 05:49, 5 December 2019 | 4,000 × 3,000 (4.62 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 | 1/400 sec (0.0025) |
F-number | f/8 |
ISO speed rating | 80 |
Date and time of data generation | 13:58, 10 June 2015 |
Lens focal length | 6.2 mm |
Image title | |
Width | 4,000 px |
Height | 3,000 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 | 21:53, 21 September 2015 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 13:58, 10 June 2015 |
Meaning of each component |
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Image compression mode | 3 |
APEX shutter speed | 8.65625 |
APEX aperture | 6 |
APEX exposure bias | −0.33333333333333 |
Maximum land aperture | 2.96875 APEX (f/2.8) |
Metering mode | Pattern |
Flash | Flash did not fire, compulsory flash suppression |
Supported Flashpix version | 1 |
Color space | sRGB |
Focal plane X resolution | 16,460.905349794 |
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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 | Landscape |
Date metadata was last modified | 15:53, 21 September 2015 |
Unique ID of original document | CAC3C13B7735DCC96ED339BEC22415CF |