I need to make it crystal clear that none of this is my own research. The pictures on this and associated pages were taken on a GSA field trip in 1994 led by Richard B. Waitt of the U.S. Geological Survey, and the interpretations presented here are largely those of Dr. Waitt as presented on the field trip and its guidebook. I thank Dr. Waitt and his colleagues for a stupendous field experience.
Because every geologist needs to see this before he dies.
|It looks drab, but there is something powerful about this monochromatic landscape.|
south. Since this valley is open at both ends but carries no through-going
stream, it probably formed by retreat of a huge series of cataracts. At
maximum flood the water was over the cliff tops.
There is something incredibly powerful about this stark, monochromatic landscape.
|Looking northwest. Steamboat Rock is just below and left of center, Grand Coulee Dam at extreme upper right. Note several dry cataracts just right of the head of the lake (Banks Lake)|
|Steamboat Rock is at lower left, Grand Coulee Dam just out of the picture at upper right. Note several dry cataracts just right of the head of the lake (Banks Lake)|
|Looking west. Grand Coulee Dam is at lower center where the Columbia River abruptly narrows.|
|Several eskers wind across the glaciated area west of Grand Coulee Dam.|
|It's not evident from this placid-looking photo but the wind was screaming at this stop.|
|Left: the boulder is resting on till|
|Looking west. Other large boulders are visible in the distance.|
|Looking northwest toward the Cascades.|
|Do glacial margins get any clearer than this? Rumpled till dotted with huge boulders ends abruptly against smooth unglaciated loess. Looking north.|
|Looking southwest. Till in the foreground, loess in the valley and beyond.|
|Looking northwest to Lake Chelan.|
Created 7 April 2003, Last Update 01 July 2012
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