File:Glacial striations from Pleistocene glaciation on dolostone (Dunham Dolomite, Lower Cambrian; Route 2 roadcut, southeast of the Lamoille River bridge, Vermont, USA) 18.jpg
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Summary[edit]
DescriptionGlacial striations from Pleistocene glaciation on dolostone (Dunham Dolomite, Lower Cambrian; Route 2 roadcut, southeast of the Lamoille River bridge, Vermont, USA) 18.jpg |
English: Glacial striations (glacial scratches) on Cambrian dolostone in Vermont, USA.
Glaciers are rivers of ice. Ice is a mineral (H2O). Glacial ice is a rock (technically, a metamorphic rock). Despite being solid, ice does flow under certain conditions at the Earth’s surface. Occasionally, Earth experiences Ice Ages, during which extensive ice sheets cover and move over significant portions of the Earth’s surface. As ice moves over landmasses, it erodes underlying rocks and picks up small to large pieces of debris. This debris accumulates at the base of the ice sheet and scrapes bedrock as the glacier moves, resulting in glacial scratches (glacial striations) (= thin scratch lines on rock) and glacial grooves (= large channels incised in rock). The Cambrian dolostone outcrop seen here has linear scratches on its surface. These are glacial striations produced during the Late Pleistocene's Wisconsinan Glaciation. Stratigraphy: Dunham Dolomite, upper Lower Cambrian Locality: roadcut on the southern side of Route 2, just southeast of bridge over the Lamoille River, northwestern Chittenden County, northwestern Vermont, USA (44° 36' 02.54" North latitude, 73° 12' 11.33" West longitude) |
Date | |
Source | https://www.flickr.com/photos/47445767@N05/49638090986/ |
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@N05/49638090986 (archive). It was reviewed on 10 March 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
10 March 2020
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 01:39, 10 March 2020 | 3,008 × 2,000 (4.52 MB) | Ser Amantio di Nicolao (talk | contribs) | Uploaded a work by James St. John from https://www.flickr.com/photos/47445767@N05/49638090986/ 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 | 11:06, 10 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 | 01:11, 9 March 2020 |
Y and C positioning | Co-sited |
Exposure Program | Not defined |
Exif version | 2.21 |
Date and time of digitizing | 11:06, 10 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 | 00 |
DateTimeOriginal subseconds | 00 |
DateTimeDigitized subseconds | 00 |
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 | 21:11, 8 March 2020 |
Unique ID of original document | 4F88C8AFC968DE5E05678FAE0D8E908B |