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 transcript:

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

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

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

Alaskan Glacier, USGS photo Cirque Arete Meltwater Lake

Alaskan Glacier, USGS photo

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

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

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

Glacial/Interglacial Timescales Orbital Variations (Ruddiman, 2001)

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

From:

From: 1 meter rise 2 meter rise 4 meter rise8 meter rise

From: From: SC202Notes/GLACgeog.HTM

(Van Diver, 1987) Glacial Processes in New Hampshire

Drumlins Kame Terraces Moraines Outwash Deposits Erratics Striations Kames and Kettles (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)