File:Glacial striations on limestone (rocky northern shore of Kelleys Island, Lake Erie, Ohio, USA) 16 (48541244551).jpg

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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: northern shoreline of Kelleys Island, western Lake Erie, Ohio, USA
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Source Glacial striations on limestone (rocky northern shore of Kelleys Island, Lake Erie, Ohio, USA) 16
Author James St. John

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This file is licensed under the Creative Commons Attribution 2.0 Generic license.
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/48541244551 (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/TimeThumbnailDimensionsUserComment
current02:29, 8 October 2019Thumbnail for version as of 02:29, 8 October 20193,008 × 2,000 (5.19 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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