In the 1920s, geologist J. Harlen Bretz was ostracized after trying to get his fellow geologists to accept his hypothesis for the unusual geologic features of eastern Washington. Bretz proposed that the deeply pockmarked terrain was not the result of slow weathering, but a catastrophic flood caused by Glacial Lake Missoula that engulfed the area thousands of years before. Evidence later lends support for Bretz's once ridiculed hypothesis and also indicates that the flood Bretz hypothesized may have been only one of many that repeatedly swept through the area.
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