Moraine, Washington State

Steven Dutch, Professor Emeritus, Natural and Applied Sciences, University of Wisconsin - Green Bay

Ice margins simply don't get sharper than this one south of Chelan, Washington. The southwesternmost corner of the Laurentide Ice Sheet spread south from Canada and stopped here. A belt of hilly terrain dotted with huge black basalt boulders has a razor-sharp boundary with smooth hills to the west (left) that were not glaciated and were covered with wind-deposited soil called loess.

Location 47o 50' 00" N, 119o 52' 14" W. The individual boulders are visible on Google Earth.

Original Scene

(author's image)

Possible Coloring

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Created 05 February 2008, Last Update 15 January 2020