File:Glacially smoothed, faceted, & striated limestone pebble from Pleistocene glacial till (Granville, Ohio, USA) 1 (31224192562).jpg
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Summary
[edit]DescriptionGlacially smoothed, faceted, & striated limestone pebble from Pleistocene glacial till (Granville, Ohio, USA) 1 (31224192562).jpg |
Pleistocene-aged glacial striations on a Devonian limestone pebble from Ohio, USA. (4.5 cm across at its widest) 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). This photo depicts a till clast of Devonian limestone that was glacially smoothed, faceted, and striated during the Pleistocene Ice Age. Geologic context: till clast from a ground moraine deposit, Pleistocene Locality: Raccoon Creek Valley, western side of Granville, Licking County, Ohio, USA |
Date | |
Source | Glacially smoothed, faceted, & striated limestone pebble from Pleistocene glacial till (Granville, Ohio, USA) 1 |
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@N05/31224192562 (archive). It was reviewed on 7 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
7 December 2019
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 18:59, 7 December 2019 | 2,493 × 2,034 (3.21 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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Metadata
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Camera manufacturer | Canon |
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Camera model | Canon PowerShot D10 |
Exposure time | 1/60 sec (0.016666666666667) |
F-number | f/10 |
ISO speed rating | 80 |
Date and time of data generation | 00:38, 2 December 2016 |
Lens focal length | 9.681 mm |
Image title | |
Width | 4,000 px |
Height | 3,000 px |
Bits per component |
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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 | 02:02, 2 December 2016 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 00:38, 2 December 2016 |
Meaning of each component |
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Image compression mode | 3 |
APEX shutter speed | 5.90625 |
APEX aperture | 6.65625 |
APEX exposure bias | −0.66666666666667 |
Maximum land aperture | 3.625 APEX (f/3.51) |
Metering mode | Pattern |
Flash | Flash fired, compulsory flash firing, red-eye reduction mode |
Supported Flashpix version | 1 |
Color space | sRGB |
Focal plane X resolution | 16,460.905349794 |
Focal plane Y resolution | 16,483.516483516 |
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 | Portrait |
Lens used | 6.2-18.6 mm |
Date metadata was last modified | 19:02, 1 December 2016 |
Unique ID of original document | E637EF4CEA1D1C7EE99EABAA8A317FD2 |