The major controversy regarding the origin of the Channeled Scabland is whether the landforms were formed mainly by multiple periodic floods or by a grand-scale cataclysmic flood from late Pleistocene Glacial Lake Missoula. Evidence for the multiple flood—as many as 40 as estimated by Waitt (1980; 1984; 1985)—hypothesis is derived mainly from lake deposits in Ninemile Creek and flood deposits in Burlingame Canyon. Shaw et al. (1999) reevaluated these sedimentary sequences and concluded that the sequences do not imply multiple floods separated by decades or centuries. They suggest that the sediment records indicate that there were sources...

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