File:Glacial Grooves State Park, Kelleys Island OH.jpg
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Summary
| Description |
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. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 00:24, 10 September 2014 | | 3,008 × 2,000 (3.71 MB) | Tillman | Transferred from Flickr via Flickr2commons |
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