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The dramatic Pennant Valley, cut by the River Twymyn, seen from the
roadside near Dylife. According to a notice nearby: "This dramatic ravine was
created by the action of first ice and then water. Before the last Ice Age, the
river Twymyn did not flow through this valley but instead followed a course
from east to west. When the ice came, the valley was filled by a glacier
flowing northwards down the side of the hill. This river of ice ground out the
earth to form a U-shaped glaciated valley. When the glacier melted the Twymyn
started to run down the wide channel left behind. The fast flowing river
further eroded the valley, cutting the V-shaped gorge seen today. This V-shaped
channel is typical of the valleys cut by young, fast-flowing streams." |