The features of interest at Lisnaragh were formed by the action of water and ice toward the end of the last Ice Age, between 17,000 and 13,000 years ago. At this time the earth’s climate was warming after the prolonged cold period that had allowed the ice to form.
The main features are a moraine (sand, gravel and mud) ridge and an outwash terrace. During the ice age, ridges of moraine were deposited by the ice across the Burn Dennet River valley. Part of one of these ridges is contained within the site. Rivers and streams flowing from the glacier front laid down what are called outwash deposits along the side of the valley. These are flat and contrast with the moraine ridge.
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