GEOS 112 Lecture Topics 42403

1
GEOS 112 Lecture Topics 4/24/03
Glaciers and Glacial Processes

• Types of Glaciers
• Glacier Formation, Mation, and Mass Balance
• Glacial Landscapes
• Erosional Features
• Depositional Features
• 4. Ice Ages

Read Chapter 12 (Glaciers) Quiz 6 on Monday
(4/28)
2
Glacial Erosion
3
Glacial Striations
4
GlacialGrooves
5
Rock Steps (roche moutonnée rock sheep in
French)
6
Glacial Landscapes Erosional Features
7
U-shaped valleys
Glacier National Park, Montana
8
Beartooth Plateau, Wyoming
Scotland, England
9
Fiords
Coastal U-shaped valleys flooded by rising
seawater
Northern Norway
10
Norway
Fiords
Canadian Artic
Alaska
11
Glacial Landscapes Erosional Features
12
hanging valley
main glacial valley
Yosemite Valley, Yosemite National Park,
California
13
(No Transcript)
14
Tributaries to the Gorner Glacier, Switzerland
15
Bridal Veil Falls, Yosemite National Park,
California
Glacier National Park, Montana
16
Glacial Landscapes Erosional Features
17
The Matterhorn
The Matterhorn, Swizterland
18
The Matterhorn, Switzerland
19
Glacial Landscapes Erosional Features
20
cirque
Canadian Rockies, Alberta
21
Glacier National Park, Montana
cirques
Northern Norway
Rocky Mtn National Park, Colorado
22
Glacial Landscapes Erosional Features
Arête
23
cirque
Canadian Rockies, Alberta
Mount Logan, Canada
24
arête
Glacier National Park, Montana
25
GEOS 112 Lecture Topics 4/24/03
Glaciers and Glacial Processes

• Types of Glaciers
• Glacier Formation, Mation, and Mass Balance
• Glacial Landscapes
• Erosional Features
• Depositional Features
• 4. Ice Ages

Read Chapter 12 (Glaciers) Quiz 6 on Monday
(4/28)
26
Glacial Landscapes Depositional
Features
Types of glacial sediment
27
Ice-related deposits (composed of till)
moraines
28
Ice-related deposits (composed of till)
lateral and medial moraines
29
lateral and medial moraines
30
Denali National Park, Alaska
31
Denali National Park, Alaska
32
Sierra Nevada, California
33
Alaska
34
Athabasca Glacier, Alberta, Canada
35
Ice-related deposits (composed of till)
moraines
36
The Glacial Conveyor Belt
37

• Glacial advance and retreat is determined by the
  balance between the accumulation of snow and the
  removal of ice by sublimation, melting, and
  calving (ablation). When the rate of ablation
  below the snowline equals the rate of
  accumulation above it, the glacier is stationary,
  as in View 1. During glacial retreat, View 2, the
  rate of ablation exceeds the rate of
  accumulation, and the position of the toe
  retreats toward the origin of the glacier.
  Glacial advance, View 3, occurs when the rate of
  accumulation exceeds the rate of ablation. For
  all views, pay attention to the motion of the
  stones. Note that in all cases, ice flows
  downhill. by Stephen Marshak
• Play Animation Windows version gtgt
• Play Animation Macintosh version gtgt

38
(No Transcript)
39
Banff National Park, Alberta, Canada
end moraine
40
(No Transcript)
41
Terminal Moraine from the Last Ice Age
42
(No Transcript)
43
Ice-related deposits (composed of till)
drumlins
Rochester area, NY
44
(No Transcript)
45
(No Transcript)
46
Glacial Landscapes Depositional
Features
Types of glacial sediment
47
Meltwater-related deposits (composed of outwash)
48
Casement Glacier, Glacier Bay National Park,
Alaska
outwash
49
(No Transcript)
50
Peyto Glacier, Banff National Park, Alberta,
Canada
51
Meltwater-related deposits (composed of outwash)
52
Wisconsin
terminal moraine
outwash plain
53
Meltwater-related deposits (composed of outwash)
54
Iceland
glacier
moraine
kettle lake
55
(No Transcript)
56
(No Transcript)
57
Meltwater-related deposits (composed of outwash)
58
(No Transcript)
59
esker
60
esker
Wisconsin
61
esker
NW Territories, Canada