File:Glacially striated boulder (Quarry Trails Park, Columbus, Ohio, USA) 1.jpg

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English: Glacial striations (glacial scratches) on a Pleistocene glacial clast in Ohio, USA.

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 rock seen here is a Precambrian metamorphic derived from eastern Canada. It was delivered to Ohio by Pleistocene glaciers. The glacial scratches on its surface (upper left to lower right) were produced during the Late Pleistocene's Wisconsinan Glaciation.

Locality: trailside, Quarry Trails Park, western side of Marblecliff Quarry (Marble Cliff Quarry), western side of Columbus, Franklin County, central Ohio, USA
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Source https://www.flickr.com/photos/47445767@N05/51778792215/
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@N05/51778792215. It was reviewed on 3 January 2022 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

3 January 2022

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