"They exhibit a unique drainage pattern that appears to have an entrance in the northeast and an exit in the southwest. The Cordilleran Ice Sheet dammed up Glacial Lake Missoula at the Purcell Trench Lobe. A series of floods occurring over the period of 18,000 and 13,000 years ago swept over the landscape when the ice dam broke. The eroded channels also show an anastomosing, or braided, appearance....
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I was living in Washington state going to graduate school mixing engineering and astronomy together back in the late '70s - and coincidentally, that was when the eastern Washington scablands were offered up as an analog to the flow features seen on Mars. One of my courses was taught by a geologist active in the space exploration program and - he was probably aware of the history of the scabland controversy dating back to the 1920s. I was not.
But in this context, I can now see some other ramifications. Especially when about a year ago, I ended up digging up an article about J. Harlen Bretz and his theories about the scablands, written in the journal Science (22 December 1978).
One of the reasons I had pulled it up was on account of someone's argument about a universal flood occurring some time around 4000 years. My counter to that was that there were a lot of independent flood features around the world that appeared to older than that, independent of each others age - and they hadn't been wiped away. Since this one was attributed to a particular glacier lake and dam structure which burst around 10,000 years ago, I argued that a universal flood should have eroded this one away as well. Ditto for the Grand Canyon. But there they are.
Just for the record, that argument didn't cut much ice (sic) that time with the Noachian viewpoint. But then when I look at the original 1978 Science article, Noachian theories appeared to be in the background in the 1920s as well. The controversy then was whether the gradualist theory in geology was as gradual and non-catastrophic as many 19th century proponents had come to accept. Bretz was met with a good deal of skepticism even though he had tons of field data from Eastern Washington for a flood of enormous magnitude.
Here's the article conclusion:
The Spokane flood controversy is both a story of ironies and a marvelous exposition of the scientific method. One cannot but be amazed at the efforts to give a uniformitarian explanation for the Channeled Scabland and to uphold the [then prevalent] framework of geology as it had been established in the writings of Hutton, Lyell and Agassiz. The final irony may be that Bretz's critics did not appreciate the scientific implications of Agassiz's famous dictum, "Read nature, not books." Perhaps no geologist has lived and understood the spirit of those words than J. Harlen Bretz."
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How much of the controversy in the 1920s and successive decades was based on a reaction in the geology community to anything that smacked of field work supportive of Biblical notions, is hard to determine from the article. But over the years catastrophism has been assimilated into both geology and evolutionary biology without the "framework" of the sciences collapsing. Impacting asteroids, volcanic explosions producing more devastation that nuclear bombs and melting glacial lakes have all had a role in both geology and biology over periods of tens of thousands of years, not to mention millions. But oddly enough, when you consider the connection with the martian surface, the flood model of Biblical literalists seems to apply more neatly out there, what with submerged hydrospheres and impacts causing gushers that sweep over frozen wastes...
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