Peter Hannigan Natural Resources Canada Geological Survey of Canada – Calgary
Ice Sheet on Ellesmere Island, Canada Photo from: Geological Survey of Canada
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Ice Sheet on Ellesmere Island, Canada Photo from: Geological Survey of Canada Continental Ice Sheets Greenland Ice Sheet Satellite Image from NASA.gov GLACIAL-INTERGLACIAL TIMESCALES
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GLACIAL-INTERGLACIAL TIMESCALES. I. Continental Ice Sheets. Ice Sheet on Ellesmere Island, Canada Photo from: Geological Survey of Canada. Greenland Ice Sheet Satellite Image from NASA.gov. II. Alpine Glaciers. Alaskan Glacier, USGS photo. Lateral Moraine. Medial Moraine. U-shaped Valley. - PowerPoint PPT Presentation
Transcript of Ice Sheet on Ellesmere Island, Canada Photo from: Geological Survey of Canada
Ice Sheet on Ellesmere Island, Canada Photo from: Geological Survey of Canada
I. Continental Ice Sheets
Greenland Ice SheetSatellite Image from NASA.gov
GLACIAL-INTERGLACIAL TIMESCALES
Alaskan Glacier, USGS photoII. Alpine Glaciers
Medial Moraine
Lateral Moraine
U-shaped Valley
Boggs. Principles of Sedimentology and Stratigraphy. 4th Edition, p 279.
U-shapedValley
Alaskan Glacier, USGS photo
Cirque
Arete
Meltwater Lake
Alaskan Glacier, USGS photo
M7.9 Earthquake on Denali Fault, November 3, 2002 / Stitched 2022_2023Photos by R. March and D. Trabant, USGS Glaciology, Fairbanks, AK11/7/2002
Boggs. Principles of Sedimentology and Stratigraphy. 4th Edition, p 277.
Glacial Environments and Timescales
Boggs. Principles of Sedimentology and Stratigraphy. 4th Edition, p 282.
Till Mt. Ranier, WA
U.S. Geological Survey photo by Bruce Molnia
Kettles: form during Glacial Retreat as block of ice are stranded in surrounding outwash and then melt.
Often associated with Kames: piles of sediment that accumulate in a depression on a retreating glacier, that then melts.
Isolated Blocks of Glacial Ice
Esker in Northern Manitoba. A Natural Resources Canada image
Drumlin near Calgary
Ice Flow Direction
Ice Flow Direction
Image created by Dr. Richard AllmendingerEarth and Atmospheric Sciences, Cornell University
Glacial/Interglacial TimescalesOrbital Variations
(Ruddiman, 2001)
“Milankovitch cycles”
Variations every 20,000 to 100,000 years
(aka “orbital cycles”)
From: http://geochange.er.usgs.gov/pub/data/sea_level/
From: www.gfdl.noaa.gov
1 meter rise 2 meter rise
4 meter rise 8 meter rise
From: http://www.mvd.usace.army.mil/mrc/images/p1_new.jpg
From: http://www.uwgb.edu/dutchs/EarthSC202Notes/GLACgeog.HTM
(Van Diver, 1987)
Glacial Processes in New Hampshire
• Drumlins• Kame Terraces• Moraines• Outwash Deposits• Erratics• Striations• Kames and Kettles
(Van Diver, 1987)
(Van Diver, 1987)
Mountain Scale
Roche moutonnée, northern Abitibi, Québec, from Geological Survey of Canada
Sheepback or Roche moutonnée
Outcrop Scale
(Van Diver, 1987)
Erratics
(Van Diver, 1987)
Glacial Lakes
Marine Submersion
(Van Diver, 1987)
