Late Quaternary megafloods from Glacial Lake Atna, Southcentral Alaska, U.S.A.

  title={Late Quaternary megafloods from Glacial Lake Atna, Southcentral Alaska, U.S.A.},
  author={Michaela Wiedmer and David R. Montgomery and Allan R. Gillespie and Harvey M. Greenberg},
  journal={Quaternary Research},
  pages={413 - 424}
Geomorphic, stratigraphic, geotechnical, and biogeographic evidence indicate that failure of a Pleistocene ice dam between 15.5 and 26 ka generated a megaflood from Glacial Lake Atna down the Matanuska Valley. While it has long been recognized that Lake Atna occupied ⩾9000 km2 of south-central Alaska's Copper River Basin, little attention has focused on the lake's discharge locations and behaviors. Digital elevation model and geomorphic analyses suggest that progressive lowering of the lake… Expand
Discussion of “Late Quaternary megafloods from Glacial Lake Atna, Southcentral Alaska, U.S.A.”
1. Multiple outburst floods from Glacial Lake Atna could not have deposited flood features in theWasilla area. Glacial Lake Atna existed during theMIS 2 glaciation, latest in a series ofExpand
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Reply to the comments of Reger, Lowell, and Evenson on “Late Quaternary megafloods from Glacial Lake Atna, Southcentral Alaska, U.S.A.”
We discussed only one Matanuska flood, not a series, but future research may reveal such evidence. RLE interpret the Lake Atna literature differently than do we. Williams (1989) assigned the nameExpand
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