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File:Glacially scratched & faceted limestone pebble from Pleistocene glacial till (Granville, Ohio, USA) (31253354871).jpg

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Pleistocene-aged glacial scratches on a Devonian limestone pebble from Ohio, USA. (3.3 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 scratched 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
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Source Glacially scratched & faceted limestone pebble from Pleistocene glacial till (Granville, Ohio, USA)
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@N05/31253354871 (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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current18:59, 7 December 2019Thumbnail for version as of 18:59, 7 December 20192,102 × 1,573 (2.04 MB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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