File:Glacial Grooves State Park, Kelleys Island OH.jpg
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Summary
DescriptionGlacial Grooves State Park, Kelleys Island OH.jpg |
Glacial grooves in Columbus Limestone (lower Middle Devonian) at Glacial Grooves State Park, northwestern Kelleys’ Island, western Lake Erie, USA. These spectacular, world-class glacial grooves were carved out during the Pleistocene (the last Ice Age). 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). |
Date | |
Source | Glacial grooves from Pleistocene glaciation on Columbus Limestone (Middle Devonian) (Glacial Grooves State Park, northwestern Kelleys Island, far-northern Ohio, western Lake Erie, USA) 4 |
Author | James St. John |
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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/14972692967. It was reviewed on 10 September 2014 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0. |
10 September 2014
Items portrayed in this file
depicts
some value
12 June 2007
0.002 second
11
48 millimetre
File history
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 00:24, 10 September 2014 | 3,008 × 2,000 (3.71 MB) | commons>Tillman | Transferred from Flickr via Flickr2commons |
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Metadata
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Camera manufacturer | NIKON CORPORATION |
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Camera model | NIKON D70s |
Exposure time | 1/500 sec (0.002) |
F Number | f/11 |
Date and time of data generation | 10:49, 12 June 2007 |
Lens focal length | 48 mm |
Orientation | Normal |
Horizontal resolution | 300 dpi |
Vertical resolution | 300 dpi |
Software used | Adobe Photoshop CS2 Macintosh |
File change date and time | 15:32, 6 September 2014 |
Y and C positioning | Co-sited |
Exposure Program | Not defined |
Exif version | 2.21 |
Date and time of digitizing | 10:49, 12 June 2007 |
Meaning of each component |
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Image compression mode | 4 |
APEX exposure bias | 0 |
Maximum land aperture | 4.4 APEX (f/4.59) |
Metering mode | Pattern |
Light source | Unknown |
Flash | Flash did not fire, compulsory flash suppression |
DateTime subseconds | 80 |
DateTimeOriginal subseconds | 80 |
DateTimeDigitized subseconds | 80 |
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 | 72 mm |
Scene capture type | Landscape |
Scene control | Low gain up |
Contrast | Normal |
Saturation | Normal |
Sharpness | Hard |
Subject distance range | Unknown |
Supported Flashpix version | 1 |
Image width | 3,008 px |
Image height | 2,000 px |
Date metadata was last modified | 11:32, 6 September 2014 |