Glaciation in Snowdonia

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Glaciation in Snowdonia-

• Some Post-Glacial Changes to the Landscape

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Snowdonia Post Glacial Changes

• Post-glacial screes due to frost shattering on
  the slopes above.

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Snowdonia Post Glacial Changes

• Fluvial erosion has cut through the morainic
  deposits in Cwm Idwal.

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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

• Footpath erosion is a problem in many popular
  sites.

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Snowdonia Post Glacial Changes

• Many paths have been paved, as in Cwm Idwal.

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Snowdonia Post Glacial Changes

• Where walkers keep to the path the surrounding
  vegetation is able to recover from erosion.

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Snowdonia Post Glacial Changes

• The small, old Cwm Dyli H.E.P. scheme has left a
  pipeline eyesore The new scheme at Dinorwig is
  hardly visible.