On a random web search the other day I came across this short but interesting geological history of Sullivan's Gulch. It's written by earth scientist and PSU grad Matthew Klaas, on his blog Uncovered Earth - a blog about adventure, education and earth science.It turns out the Gulch got its start only about 15,000 years when a series of massive floods came down what is now the Columbia Gorge and had to flow around Rocky Butte and so carved out the area we call Sullivan's Gulch. These floods are also the cause Alameda Ridge as well.
Click on Uncovered Earth above to read the full story. Thanks Matthew.
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