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USGS Geology in the Parks

USGS logo annimation by Ralph Haugerud and Harvey Greenberg
The last (Vashon) glaciation of the Puget Lowland  Inputs:
  • global sea level
  • ice advance and retreat
  • isostatic depression and rebound
  • initial topography (a fiction!)
Ice advance and retreat were rapid. Seattle was covered by ice for less than 2,000 years. At glacial maximum about 1 km (3,000 ft) of ice covered Seattle.

 Return to Olympic Geology, Glaciers: The Heavier Hand


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