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3
Snowdonia – Post Glacial Changes
Fluvial erosion has cut through the morainic deposits in Cwm Idwal.
4
Snowdonia – Post Glacial Changes
Lakes have been infilled as shown by these lake deposits in the Nant Ffrancon valley.
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Snowdonia – Post Glacial Changes
Soils and vegetation have developed on both the bare rock and morainic surfaces left after the ice retreated.
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Snowdonia – Post Glacial Changes
Grazing by sheep has resulted in a distinctive grassland flora; trees and heather only occur where sheep are unable to graze.
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Snowdonia – Post Glacial Changes
Where walkers keep to the path the surrounding vegetation is able to recover from erosion.