Misplaced Pages

Chatter mark

Article snapshot taken from Wikipedia with creative commons attribution-sharealike license. Give it a read and then ask your questions in the chat. We can research this topic together.
(Redirected from Crescentic gouge) Mark left by rocks within moving glaciers For chatter marks made in machining, see Chatter (machining).
Brown crescent-shaped chatter marks on a formation of gray sandstone.
Chatter marks on sandstone south of Lac Beauchamp, in Gatineau, Quebec, Canada

In glacial geology, a chatter mark is a wedge-shaped mark (usually of a series of such marks) left by chipping of a bedrock surface by rock fragments carried in the base of a glacier (glacial plucking). Marks tend to be crescent-shaped and oriented at right angles to the direction of ice movement.

There are three different types of chatter marks. The crescentic gouge is an upstream concave that is made by the removal of a piece of rock. The crescentic fracture is a downstream concave that is also made by the removal of rock. The lunate fracture is also a downstream concave made without the removal of rock.

See also

References

  1. Marshak, Stephen, 2009, Essentials of Geology, W. W. Norton & Company, 3rd ed. ISBN 978-0393196566
  2. Dictionary of Geological Terms, Third Edition (1984). American Geological Institute Publications. Robert L. Bates and Julia A. Jackson, Editors
  3. Encyclopædia Britannica


Stub icon

This glaciology article is a stub. You can help Misplaced Pages by expanding it.

Categories: