River level, over which water once cascaded; Huge potholes, requiring enormously turbulent water; Gigantic boulders, up to 200 tons. Portland, OR: Timber Press, 1986. Only in the 1950s and 1960s was Bretz's hypothesis regarding the Missoula Floods accepted and his contributions recognized. Like a detective, Bretz gathered as many clues as he could and reached what he believed to be the best solution to the geologic puzzle of the Missoula Floods.
Lake Missoula was formed by the glacial damming of the Clark Fork River at the end of the last ice age (approximately 10,000 years ago). While teaching high school biology in Seattle, Washington, he became interested in glacial landforms in the Puget Sound area that were formed during the most recent glacial period (ending about 10,000 years ago). Mueller, Marge, and Ted Mueller. This figure shows the maximum extent of the last ice sheet in what is today the.S. A Pioneering Theorist, born in Michigan in 1882, Bretz showed an early interest in science, and in college obtained a biology degree. Enormous gravel bars, 90 to 120 meters (300 to 400 feet) high.
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