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1. Glacial Erosion and Depositional Features How Do Glaciers Affect the Landscape?
2. Glacial Erosion Glaciers remove loose rock from the valleys
The flowing glacier pries rocks loose and incorporates them into the ice
3. Glacial Striations Rocks scrape the underlying bedrock
This picture was taken near Squamish 1997
4. Valley Shape Glaciers will carve out a U shaped valley
5. A fjord is a U shaped valley filled in with water. Its also called an inlet. Fjords and Inlets
6. Erosional Features At the top of an alpine glacier a semicircular basin is carved out called a cirque
When two cirques form on a peak the ridge separating them is called an arte
Three or more cirques on a mountain can carve out a horn
7. The glacier erodes
8. After the glacier melts
9. The Matterhorn In the Swiss alps
10. A Swiss glacier is eroding the mountain. Glacier at work
11. Swiss Alps are glacially sculpted
12. Glacial Deposits Glaciers pick up everything in its path, even the largest boulders.
Large amounts of sediment can be carried large distances by glaciers.
Glacial deposit is called till.
13. Erratics Erratics are large boulders carried and then deposited by a glacier.
It marks the furthest extent of the glacier.
Near 12th Avenue and 200th Street, Surrey.
14. Glacial Erratics
15. Burnaby Mountain Park Glacial Erratics
16. Moraines A moraine is a mound or ridge of till deposited by a glacier
The different places along a glaciers advance will result in the different types of moraines
17. Moraine dams the lake
18. Banff National Park
The haze is from the forest fires of 2003 Moraine Lake
19. Bluest lake in the Rockies. The glacial till causes the light to be scattered leaving the lake very blue. Peyto Lake
20. End moraine of the Matanuska Glacier, Alaska.
Note the poorly sorted sediment; The boulders are several meters in diameter. End Moraine
21. The terminus of a glacier may remain stationary for years.
The sediment piles up in a ridge called an end moraine.
If this marks the furthest extent of the glacier it is a terminal moraine. Formation of end moraine
22. Retreating Glacier End moraine
23. The retreating Athabasca Glacier
24. On the Athabasca Glacier
25. Lateral Moraine Lateral moraines are accumulations of sediment on the margins of glaciers.
Rock slides, rock falls, snow avalanches and other forms of mass wasting are especially efficient at loading the margins of the glacier with this material.
26. Formation of a Medial Moraine The medial moraine forms where two tributary glaciers meet, and their adjacent lateral moraines merge to form the medial moraine.
27. Kennicott Glacier, Alaska.
28. Medial Moraine Switzerland, Aletsch Glacier in the Bernese Oberland