What types of moraines are shown at A and B? State if each moraine is subglacial, englacial or supraglacial.
A B Drumlins
Drumlins are oval-shaped hills that are made of deposited boulder clay (a mixture of sand and clay). They often occur in large numbers known as swarms.
Map view (elevation contour lines)
Direction of glacial flow
Height
Direction of glacial flow
10 20 30 40 50
Length
When close together, contour lines indicate a steep slope.
When far apart, contour lines indicate a gentle slope.
Formation
1 2
3
Glacial ice deposits boulder clay in irregular heaps.
The ice retreats and then advances again. This time it shapes and smooths the boulder clay into rounded oval-shaped hills.
The steep slope of the drumlin is the direction from which the ice advanced. The gentle slope points to the direction in which the ice was travelling.
Examples: Clew Bay, Co. Mayo and Lower Lough Erne, Co. Fermanagh. 165 Drumlins
Side view of the drumlin
This is the view from above, using contour lines on OS maps
