Drumlins

• Drumlins are elongated hills made up of unsorted glacial deposits (Till)
• Made of till because ice deposits all the material at the same time underneath a glacier as it moves downhill.
• Drumlins form when a glacier becomes overloaded with sediment and deposits it. The sediment streamlines as the glacier flows over the top of it.
• The steep 'stoss' slope faces up-valley.
• The gently sloping 'lee' slope faces down valley
• If there is a small obstacle on the ground it may act as a trigger point and till can build up around it.
• Drumlins may be reshaped by further ice movements after the sediment was originally deposited.
• Drumlins are found in swarms or a 'basket of eggs' topography.
• Drumlins also form when ice flows over a layer of sediment that is deeper than normal.
• The large weight of ice on top of the sediment causes pressure on top of it moulding it into a drumlin shape.
• Drumlin Example: Glasgow
• If 12 mark include glacier formation.