1. Glacial Landforms 1.Alpine erosional landforms 2.Alpine depositional landforms 3.Continental glacial landforms (erosional and depositional

2. Alpine Glacial Erosional Landforms

3. cirque

5. Tarn rock bound lake

6. Tarn (looking down)

7. horn

8. Horns have cirques on all sides (Mitre Peak, New Zealand)

9. U-shaped glacial trough from v-shaped river valley

12. Hanging Valley

13. Originally

14. After Ice Melts

16. Fjord

18. Iceland

19. Telluride

20. Snowbird – Little Ice Age Cirques

23. Glaciers smooth aretes and allow travel over these col passes

24. Melting from Pressure: upside

25. Polishing on up side

26. Direction of Ice Flow

27. Glacial Grooves

29. Plucking refreezing around rock

30. Plucking refreeze and pull out

31. Alpine Depositional Landforms Boulders,Cobble Sand, Silt – where does it come from? Mass Wasting, avalanches onto glacier Erosion along the bed of a glacier

32. Till – boulders down to clay deposited in contact with a glacier

33. Deposited in the Ablation Zone

34. Basic forms, after glacier ablates

35. Moraines – ridges of till

36. Lateral moraines – from avalanches on the sides of the glacier

37. Accumulation Zone Ablation Zone tarn in cirque lateral moraine Lateral moraines – evidence when the glacier is all gone of its extent

38. Lateral moraines – deposited in ablation zone

39. lateral moraines join end moraine

40. Glaciers are a conveyor belt and moraines are the ‘garbage dump’ animated gif that should play (don’t worry if it does not)

41. end or terminal moraine (shows maximum extent) end moraine

42. Recessional Moraine

43. Laterals join recessional/end moraine end moraine

44. laterals come together as medial moraines

45. Only see medial moraines when glaciers are present (they are destroyed by meltwater streams)

46. Meltwater streams deposit outwash plains

50. Fox Glacier, New Zealand

51. Glacial Erratics – giant boulders left behind: Noah’s flood or ancient ice age?

52. Religion vs. Science

53. Continental Glacial Landforms Biggest Changes (where see evidence) Laurentide ice sheet: eastern N Am. Cordilleran ice sheet: Canadian Rockies Eurasian ice sheet: northern Europe Classroom Resource: Little Change in Antarctica

54. Biggest Changes Laurentide ice sheet: eastern N Am. Cordilleran ice sheet: Canadian Rockies Eurasian ice sheet: northern Europe

55. Wisconsin – 20 ka

57. On the ocean side …icebergs carried glacial sediment into the Atlantic Very cold & wet pulses

58. Gulf Stream further south – so northern Europe froze Heinrich events - Very cold & wet pulses

60. Under the Ice Areas of Scour: rock ground down, plucked, and quarried producing lots of bare rock and lakes Deep Valley Cutting: large troughs eroded by concentrated abrasion, quarrying and plucking Areas of Little Erosion: where its so cold that all the pressure can’t melt the bottom ice, cold-based glaciers produce little movement and little erosion

61. Aerial Scouring: East Antarctica

62. Aerial Scouring: Ireland

63. Aerial Scouring: Finland and Newfoundland

64. Deep Valley Cutting: Finger Lakes

65. Deep Scour Long Island Terminal Moraine

66. Started with deep scouring, then got complicated

67. Each of these in turn

68. End Moraine: Greenland

70. End of Cordilleran Ice Sheet Outwash Till Plain (or ground moraine)

72. Drumlins

73. Oriented with flow

74. Drumlins in Patagonia

75. Perhaps formed under areas of fast moving ice

78. Kettle Lakes

79. Spectacular Outwash: Iceland

80. Online Resources Glacier Physics http://serc.carleton.edu/NAGTWorkshops/visualization/collections/glaci er_physics.html Origin of Glaciation http://serc.carleton.edu/NAGTWorkshops/visualization/collections/glaci ation_origins.html Glacial Landforms Resulting from Erosion and Deposition http://serc.carleton.edu/NAGTWorkshops/visualization/collections/glaci al_landforms.html Examples of Deglaciation http://serc.carleton.edu/NAGTWorkshops/visualization/collections/degla ciation.html