Glaciation In Snowdonia Some Post Glacial Changes

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.