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There are four sections in the Geology stack.




The Upper and Lower Resevoirs of the Dodder are situated in a glaciated valley. This valley was created by a glacier. Before the glacier moved into position it had collected boulders, rocks, stones, pebbles, gravel, sand and clay. These were embedded in the ice of the glacier and as it moved eroded the underlying rock. The glacier was in the valley for thouands of years and while it was there it slowly moved downwards and sideways. This caused the sides of the valley to become steeper and the bottom to become wider.When the ice melted there was a steep - sided u-shaped valley with a lot of glacial till left behind. The Dodder began to cut its way down through the glacial till.The engineers in the 19th century thought this was an ideal place for a resevoir.



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