Glacial erosion can form U-shaped valleys and hanging valleys. U-shaped valleys are formed as glaciers erode existing river valleys, deepening and widening them into a characteristic U-shape with steep sides and a flat floor. Hanging valleys form when a tributary glacier erodes a valley that runs above and perpendicular to the main valley. As the main glacier recedes, it leaves behind steep walled, high elevation valleys hanging over the main valley below.

1. Glacial Erosion features - Glacial Valleys Objectives: To understand the formation of the following glacial erosion features: U – shaped valleys Hanging valleys To know the terms: truncated spurs, alluvial fan

3. Glacial features on an OS map

4. Pyramid Peak Arete Valley Glacier Corrie

5. Corrie Arête Pyramidal Peak

7. Types of Glaciers – Valley Glacier Tongas National Forest, Alaska

9. U shaped Valleys

11. U-Shaped Valley in Tracy Wilderness, Southeastern Alaska

12. U-shaped valley formation

15. U-shaped valley (trough) The Nant Ffrancon Valley The once u-shaped valley has been distorted by moraine deposits and a collection of scree from weathering and mass movement.

16. U shaped Valley Glacial U shaped valley with steep sides, flat floor, and truncated spurs (middle left)

18. Langdale – a U-shaped valley Steep valley sides Flat valley floor

20. Hanging Valley A HANGING VALLEY is a glacial valley that runs above and perpendicular to another glacial valley

21. Hanging Valley

23. Receding tributary glacier Medial moraines Former height of glacier Main valley glacier Hanging valley Truncated spur U shaped valley ‘ Misfit’ stream Waterfall Corrie Pyramid peak Truncated spur

24. On an O.S. map

26. Can you identify a corrie, pyramid peak, hanging valley, terminal moraine, corrie lip, arete, glacial trough? In summary….