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Encyclopedia > Terminal moraine

Moraine is the general term for debris of all sorts originally transported by glaciers or ice sheets that have since melted away. The following are commonly recognized types of moraine: This article is about the geographical formation. ...

Moraine at Mono Lake, California, USA
Moraine at Mono Lake, California, USA
  • Lateral moraine: The talus and other material from the sides of a glacial valley accumulated on the glacier and carried along with it. The mass of debris distributed along the lateral edges of the glacier are thus called lateral moraine. In the case of valley glaciers which have disappeared, their former existence may often be proved by the traces of lateral moraines left along the sides of the valley.
  • Medial moraine: If one or more tributary glaciers coalesce with the main glacier the lateral moraines unite to form trains of debris on the surface of the glacier at or near its center, called medial moraines.
  • Terminal moraine: When balance is maintained between the melting of a glacier and its forward advance, the debris carried on (superglacial), within (englacial), and dragged along the bottom (subglacial) is dumped at that point and builds up a heterogeneous mass of the transported material called the terminal moraine. If a glacier is slowly retreating and makes successive halts farther and farther up the valley, a series of terminal moraines are formed which are spoken of as recessional moraines.
  • Interlobate moraine: If large glaciers and continental ice sheets advance irregularly so that their margins are lobate, when the margins retreat by melting the resulting terminal moraines of boulders, clay, and sand simulate the original interlobate shape of the glacier or glaciers, and therefore such moraines are called interlobate.
  • Ground moraine: When a valley glacier melts completely away the debris carried on or within it are dropped on the valley floor, forming a deposit called ground moraine. The ground moraine from the melting of the great Pleistocene ice sheets is usually spoken of as till.
Lateral moraine on a glacier joining the Gorner Glacier, Zermatt, Switzerland. The moraine is the high bank of debris in the top left hand quarter of the picture. For more explanation, click on the picture.
Lateral moraine on a glacier joining the Gorner Glacier, Zermatt, Switzerland. The moraine is the high bank of debris in the top left hand quarter of the picture. For more explanation, click on the picture.

Image by Daniel Mayer taken in September 2003 and released under terms of the GNU FDL Processed for better clarity and colour by Adrian Pingstone in May 2004. ... Image by Daniel Mayer taken in September 2003 and released under terms of the GNU FDL Processed for better clarity and colour by Adrian Pingstone in May 2004. ... Talus (which is Latin for ankle-bone), has several meanings: in mountaineering and climbing, talus is small broken rock found on mountain slopes and at the base of cliffs. ... Fljótsdalur in East-Iceland A valley is a landform, which can range from a few square miles (square kilometers) to hundreds or even thousands of square miles (square kilometers) in area. ... Clay is a generic term for an aggregate of hydrous silicate particles less than 4 μm (micrometres) in diameter. ... Patterns in the sand Sand is an example of a class of materials called granular matter. ... The Pleistocene Epoch is part of the geologic timescale, usually dated as 1. ... This article is about glacial sediments, for other uses see till (disambiguation). ... Lateral moraine on a glacier joining the Gorner Glacier, Zermatt, Switzerland. ... Lateral moraine on a glacier joining the Gorner Glacier, Zermatt, Switzerland. ...

See also


  Results from FactBites:
 
Moraine - Wikipedia, the free encyclopedia (362 words)
Moraine is the general term for debris of all sorts originally transported by glaciers or ice sheets that have since melted away.
Terminal moraine: When balance is maintained between the melting of a glacier and its forward advance, the debris carried on (superglacial), within (englacial), and dragged along the bottom (subglacial) is deposited at that point and builds up a heterogeneous mass of the transported material called the terminal moraine.
Interlobate moraine: If large glaciers and continental ice sheets advance irregularly so that their margins are lobate, when the margins retreat by melting the resulting terminal moraines of boulders, clay, and sand simulate the original interlobate shape of the glacier or glaciers, and therefore such moraines are called interlobate.
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