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GEOG 205 (26)
Lecture

February 13th

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Department
Geography
Course
GEOG 205
Professor
Gail Chmura
Semester
Winter

Description
February 13 , 2013: Glacial Lakes  stadial: cold period within a glacial period  channelled scablands: holes 60 m deep o caused by slow, normal erosion? o caused by large volumes of water in a few days? o doctrine of catastrophism? o principle of uniformitarianism? (processes occurring in present are same as those in the past) o pro-glacial lakes  Wisconsinan was the last glacial advance of the Pleistocene  Columbia River formed from ice dam breaking from Cordillera ice sheet  most geologists through channeled scablands from normal erosion by normal amounts of water  Bretz examined size/spacing/placement of features  had to be caused by movement of large volumes of water over short time periods  theory not accepted since no evidence & very close to catastrophism which would negate uniformitarianism  source of catastrophic floods found
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