Glacial grooves from Pleistocene glaciation on Columbus Limestone (Middle Devonian) (Kelleys Island, far-northern Ohio, western Lake Erie, USA)

            Glacial grooves on Columbus Limestone (lower Middle Devonian) from Kelleys Island, western Lake Erie, USA (public display, Field Museum of Natural History, Chicago, Illinois, USA).
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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).

   

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Taken on: June 11, 2010

Tags:

glacial

grooves

scratches

Pleistocene

Ice

Age « less

Sets appears in: • Pleistocene Rocks & Fossils • Kelleys Island (Lake Erie, Ohio, USA) more » • Glacial Grooves, Glacial Striations, Glacial Scratches « less

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