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Ice Sheet on Ellesmere Island, Canada Photo from: Geological Survey of Canada I. Continental Ice Sheets Greenland Ice Sheet Satellite Image from NASA.gov.

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Presentation on theme: "Ice Sheet on Ellesmere Island, Canada Photo from: Geological Survey of Canada I. Continental Ice Sheets Greenland Ice Sheet Satellite Image from NASA.gov."— Presentation transcript:

1 Ice Sheet on Ellesmere Island, Canada Photo from: Geological Survey of Canada I. Continental Ice Sheets Greenland Ice Sheet Satellite Image from NASA.gov GLACIAL-INTERGLACIAL TIMESCALES

2 Alaskan Glacier, USGS photoII. Alpine Glaciers Medial Moraine Lateral Moraine U-shaped Valley

3 Boggs. Principles of Sedimentology and Stratigraphy. 4th Edition, p 279. U-shaped Valley

4 Alaskan Glacier, USGS photo Cirque Arete Meltwater Lake

5 Alaskan Glacier, USGS photo

6 M7.9 Earthquake on Denali Fault, November 3, 2002 / Stitched 2022_2023 Photos by R. March and D. Trabant, USGS Glaciology, Fairbanks, AK 11/7/2002

7 Boggs. Principles of Sedimentology and Stratigraphy. 4th Edition, p 277. Glacial Environments and Timescales

8 Boggs. Principles of Sedimentology and Stratigraphy. 4th Edition, p 282. Till Mt. Ranier, WA

9 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

10 Esker in Northern Manitoba. A Natural Resources Canada image Drumlin near Calgary Ice Flow Direction

11 Image created by Dr. Richard Allmendinger Earth and Atmospheric Sciences, Cornell University

12 Glacial/Interglacial Timescales Orbital Variations (Ruddiman, 2001)

13 “Milankovitch cycles” Variations every 20,000 to 100,000 years (aka “orbital cycles”)

14 From: http://geochange.er.usgs.gov/pub/data/sea_level/

15 From: www.gfdl.noaa.gov 1 meter rise 2 meter rise 4 meter rise8 meter rise

16 From: http://www.mvd.usace.army.mil/mrc/images/p1_new.jpg From: http://www.uwgb.edu/dutchs/Earth SC202Notes/GLACgeog.HTM

17 (Van Diver, 1987) Glacial Processes in New Hampshire

18 Drumlins Kame Terraces Moraines Outwash Deposits Erratics Striations Kames and Kettles (Van Diver, 1987)

19 Mountain Scale Roche moutonnée, northern Abitibi, Québec, from Geological Survey of Canada Sheepback or Roche moutonnée Outcrop Scale

20 (Van Diver, 1987) Erratics

21 (Van Diver, 1987) Glacial Lakes Marine Submersion

22 (Van Diver, 1987)


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