File:Glacial striations on limestone (Inscription Rock, Kelleys Island, Lake Erie, Ohio, USA) 1 (48541220531).jpg
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Summary
[edit]DescriptionGlacial striations on limestone (Inscription Rock, Kelleys Island, Lake Erie, Ohio, USA) 1 (48541220531).jpg |
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 glacial striations seen here were incised on Devonian fossiliferous limestone during the Pleistocene (= last Ice Age). Stratigraphy: Columbus Limestone, Eifelian Stage, lower Middle Devonian Locality: Inscription Rock, southern shoreline of Kelleys Island, western Lake Erie, Ohio, USA |
Date | |
Source | Glacial striations on limestone (Inscription Rock, Kelleys Island, Lake Erie, Ohio, USA) 1 |
Author | James St. John |
Licensing
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/48541220531 (archive). It was reviewed on 8 October 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
8 October 2019
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 02:27, 8 October 2019 | 3,007 × 1,750 (4.46 MB) | Ser Amantio di Nicolao (talk | contribs) | 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 | 1/125 sec (0.008) |
F-number | f/4 |
ISO speed rating | 200 |
Date and time of data generation | 10:37, 7 June 2012 |
Lens focal length | 18 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 | 23:47, 10 August 2019 |
Y and C positioning | Co-sited |
Exposure Program | Not defined |
Exif version | 2.21 |
Date and time of digitizing | 10:37, 7 June 2012 |
Meaning of each component |
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Image compression mode | 4 |
APEX shutter speed | 6.965784 |
APEX aperture | 4 |
APEX exposure bias | 0 |
Maximum land aperture | 3.6 APEX (f/3.48) |
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 | 27 mm |
Scene capture type | Standard |
Scene control | None |
Contrast | Normal |
Saturation | Normal |
Sharpness | Normal |
Subject distance range | Unknown |
Serial number of camera | 200638ad |
Lens used | 18.0-200.0 mm f/3.5-5.6 |
Date metadata was last modified | 17:47, 10 August 2019 |
Unique ID of original document | 71337ABFA4D8DB98E2A902D7B3810DDC |