File:Glacial striations on limestone (outcrop near Inscription Rock, Kelleys Island, Lake Erie, Ohio, USA) 5 (48541381542).jpg
![File:Glacial striations on limestone (outcrop near Inscription Rock, Kelleys Island, Lake Erie, Ohio, USA) 5 (48541381542).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/2/21/Glacial_striations_on_limestone_%28outcrop_near_Inscription_Rock%2C_Kelleys_Island%2C_Lake_Erie%2C_Ohio%2C_USA%29_5_%2848541381542%29.jpg/800px-Glacial_striations_on_limestone_%28outcrop_near_Inscription_Rock%2C_Kelleys_Island%2C_Lake_Erie%2C_Ohio%2C_USA%29_5_%2848541381542%29.jpg?20191008022833)
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[edit]DescriptionGlacial striations on limestone (outcrop near Inscription Rock, Kelleys Island, Lake Erie, Ohio, USA) 5 (48541381542).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: outcrop near Inscription Rock, southern shoreline of Kelleys Island, western Lake Erie, Ohio, USA |
Date | |
Source | Glacial striations on limestone (outcrop near Inscription Rock, Kelleys Island, Lake Erie, Ohio, USA) 5 |
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@N05/48541381542 (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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current | 02:28, 8 October 2019 | ![]() | 3,008 × 2,000 (5.21 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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Number of components | 3 |
Horizontal resolution | 300 dpi |
Vertical resolution | 300 dpi |
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File change date and time | 07:38, 2 August 2019 |
Y and C positioning | Co-sited |
Exposure Program | Not defined |
Exif version | 2.21 |
Date and time of digitizing | 10:48, 7 June 2012 |
Meaning of each component |
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File source | Digital still camera |
Scene type | A directly photographed image |
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Focal length in 35 mm film | 52 mm |
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Date metadata was last modified | 01:38, 2 August 2019 |
Unique ID of original document | 1274458824A30A064EFCBD54F49100ED |