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Glacial depositional landforms
- Drumlins
- Smooth, oval shaped hills
found in lowland locations on
valley floors where the ice has
emerged from the highlands
- Can be as long as 1.5km (most
smaller) and up to 60m in height
- Poorly sorted glacial till
- Poorly sorted glacial till
- Steep end (stoss) and gently sloping end (leeside)
- Elongated in direction of ice advance
- Often found in-groups known as
swarms 'basket of eggs
topography'
- Often found in-groups known as
swarms 'basket of eggs
topography'
- Elongated in direction of ice advance
- Eden Valley, Cumbria
- Debate over exact formation of drumlins as formed sub glacially and only revealed once ice has disappeared
- Lodgement of subglacial debris as melts out of basal ice
- Reshaping of previously deposited material during subsequent re-advance
- Accumulation of material around a bedrock obstruction (rock-cored drumlins)
- Thinning of ice as spreads over lowland area reducing ability to carry
debris, continued forward movement streamlines feature
- Lodgement of subglacial debris as melts out of basal ice
- Smooth, oval shaped hills
found in lowland locations on
valley floors where the ice has
emerged from the highlands
- Erratics
- Individual pieces of rock with
distinctive geology different
from the area in which they
were found
- May vary in size from
small pebbles to large
boulders
- May vary in size from
small pebbles to large
boulders
- Norber Erratics - Yorkshire Dales
- Pieces of rock which have been
transported by a glacier from one
area and deposited in an area of
different rock type
- Likely they were eroded by plucking and
entrained in the glacier or were
frost-shattered from the valley sides,
becoming supra-glacial debris by rockfall
- Likely they were eroded by plucking and
entrained in the glacier or were
frost-shattered from the valley sides,
becoming supra-glacial debris by rockfall
- Individual pieces of rock with
distinctive geology different
from the area in which they
were found
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