Llyn Peris
Also within
Geology & landscape
Geological Period: Quaternary
Landscape processes: Glacial
Description
Description This site is selected for its geomorphological interest as a classic Quaternary location and comprises part of the shores of Llyn Peris, a component reservoir of the Dinorwig Pump Storage scheme half a mile south of Llanberis. The shores of Llyn Peris are important for exceptionally fine examples of glaciated bedrock surfaces and small-scale forms of glacial erosion. Although it is some 13,000 years since the area was last glaciated, features including glacial striae, friction cracks, sichelwannen and sinuous grooves and channels have been remarkably well preserved from subaerial weathering beneath the lake waters. Both the diversity of the forms and their degree of freshness make Llyn Peris an important site for studies of glacial erosion and glacier rockbed-forms.