Landforms of Glacial Deposition

Quick revise

There are three types of glacial deposition

  • Moraines
  • Drumlins (boulder clay or till)
  • Erratics

This is the name given to fragments of rock transported by the glacier and deposited when it melts

  • Terminal Moraine:is deposited by the glacier at the snout as it retreats
  • Medial Moraine: is material carried in the middle of the glacier
  • Lateral Moraine: is the material that has fallen onto the side of a glacier and carried along by it.
  • These are large boulders or rocks which have been carried by a glacier and deposited in area where it does not belong
  • For example it would mean a large boulder of limestone being deposited in an area where the bedrock is made of granite!
  • These are made up of a mixture of angular rock fragments and clay (formed by the pressure of ice grinding down the rock over time)
  • When the glacier is moving it deposits this clay and rock mixture from the underneath of the glacier.
  • As the glacier moves over the boulder clay it shapes them into an egg shape with a high rounded back and narrow tail.

Lochaber – a glaciated valley landscape

This video looks the key features of a glaciated valley are described using the Lochaber area of Scotland as an example. Graphics and aerial views are used to explain the low level glaciated features of the Lochaber area. The creation of u-shaped valleys, truncated spurs, hanging valleys, alluvial fans, roches moutonnées, erratics, moraine deposits and misfit streams is explained.

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