The Origin of the Rio Plomo Ice-Dam

end. I cannot help feeling that accumulation till a critical angle is reached, plus lubrication by water on a scale that we do not appreciate in temperate and polar lands, form essential parts of the mechanism that Professor Mason has described so vividly. I am prepared to believe that some of the extraordinary movements may affect the collecting ground comparatively little, and that the deficiency may be most felt in the higher reaches of the glacier. We should not lose sight of the observation that the dates of rapid advance vary with the glaciers, and that each glacier may have its own period, while the field as a whole may show no change. The PRESIDENT: Having regard to the hour, I think we must close the discussion now. It must be obvious to all who have listened to the very interesting paper that the problem discussed is one of vital importance. There are, it seems to me, so many ramifications of it that there is endless room for scientific investigation. Speaking as an ignoramus it seems to me that not only may the cause be climatic in one case and topographic in another, but that both influences may well be acting on the same glacier, and on the other hand that every or any glacier may be moving or behaving from quite different causes from its neighbour a few miles away. I have not the knowledge on which to discuss this vital question more than superficially, so I can only ask you now to join with me in thanking Professor Mason for his paper, and the other speakers, Mr. Goudge, Mr. Pilditch, Dr. Longstaff-whose remarks were particularly interesting-and Dr. Sandford, for kindly joining in the discussion

Archaeology · Earth science · Geography · Physical geography · Cryospheric studies and observations · Geology

• Alaskan Ice-Dammed Lakes 1

  Kirk H Stone•Annals of the Association of…•1963

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