Already knew about this...I attended Soil Science Institute (a 4-week training session for professional soil scientists) at Washington State University this summer, and we took field trips into the Channeled Scablands to study just this event. It was fascinating (and a beautiful area). If we ever meet in person, I'll tell you all about it.
I grew up in Eastern Washington. Some of the most fascinating geology there is... You can find examples of just about anything there.
Yeah, I first heard about this at Columbia Basin Sporstman Club banquetback inthe early '90's. The first real work on this by a geologist named Bretz, was rejected by the geological society back in the 1920's.
It sure is good to know that we have to pay for this "new" research over and over again. Here are just a few of the links:
http://www.fs.fed.us/r6/columbia/missoula.htm
http://gsahist.org/gsat2/pardee.htm
http://www.nps.gov/iceagefloods/contacts.htm
If you want more just type in "Columbia Basin Scablands", "Eastern Washington Geology", or "Bretz, J.H." in your search engine"..