Glaciation In Snowdonia   Some Post Glacial Changes
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Glaciation In Snowdonia Some Post Glacial Changes

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Glaciation In Snowdonia Some Post Glacial Changes Presentation Transcript

  • 1. Glaciation in Snowdonia - Some Post-Glacial Changes to the Landscape
  • 2. Snowdonia – Post Glacial Changes
    • Post-glacial screes due to frost shattering on the slopes above.
  • 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.
  • 5. Snowdonia – Post Glacial Changes
    • Soils and vegetation have developed on both the bare rock and morainic surfaces left after the ice retreated.
  • 6. 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.
  • 7. Snowdonia – Post Glacial Changes
    • Footpath erosion is a problem in many popular sites.
  • 8. Snowdonia – Post Glacial Changes
    • Many paths have been paved, as in Cwm Idwal.
  • 9. Snowdonia – Post Glacial Changes
    • Where walkers keep to the path the surrounding vegetation is able to recover from erosion.
  • 10. 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.