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Bretz's view, which was seen as arguing for a catastrophic explanation of the geology, ran against the prevailing view of uniformitarianism, and Bretz's views were initially disregarded. C, invited the young Bretz to present his previously published research at a January 12, 1927 meeting where several other geologists presented competing theories. Bretz defended his theories, and this kicked off an acrimonious 40-year debate over the origin of the Scablands.Both Pardee and Bretz continued their research over the next 30 years, collecting and analyzing evidence that led them to identify Lake Missoula as the source of the Spokane Flood and creator of the Channeled Scablands.

He was researching the Channeled Scablands in Eastern Washington, the Columbia Gorge, and the Willamette Valley of Oregon.Shaw's team of geologists reviewed the sedimentary sequences of the Touchet beds and concluded that the sequences do not automatically imply multiple floods separated by decades or centuries.Rather, they proposed that sedimentation in the Glacial Lake Missoula basin was the result of jökulhlaups draining into Lake Missoula from British Columbia to the north.Glacial deposits overlaid with centuries of windblown sediments (loess) have scattered steep, southerly-sloping dunes throughout the Columbia Valley, ideal conditions for orchard and vineyard development at higher latitudes.

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After analysis and controversy, geologists now believe that there were 40 or more separate floods, although the exact source of the water is still being debated.

The Missoula Floods (also known as the Spokane Floods or the Bretz Floods) refer to the cataclysmic floods that swept periodically across eastern Washington and down the Columbia River Gorge at the end of the last ice age.

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