3. A drumlin swarm in Clew Bay D C A B Working with others:
Figure 3 shows a drumlin swarm in Clew Bay, Co. Mayo. These drumlins were partially submerged (drowned) when the sea rose at the end of the Ice Age.
1. How do you know by the shape of these islands that they are drumlins?
2. The place labelled A on the photograph is shown as Rosnakilly on the OS map. Using the map to help you, name the points labelled B and C and the island labelled D on the photograph.
3. Is there any evidence on the photograph or map that the drumlins shown may have been inhabited in ancient times?
Erratics
Erratics are large boulders that were deposited by ice in an area where the rock type of the area is quite different to the rock type of the boulder. Because of this, the boulders look out of place in the landscape in which they now stand. Erratics can tell us how far and in what direction ice has travelled.
Example: Erratics of granite can be found in the limestone area of the Burren, Co. Clare, as seen in the image on the right.
1. Name one feature of glacial deposition. (a) Name one example of that feature. (b) Draw a labelled diagram of the feature. (c) Explain how the feature was formed.
