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Geomorphic, stratigraphic, geotechnical, and biogeographic evidence indicate that failure of a Pleistocene ice dam between 15.5 and 26ka generated a megaflood from Glacial Lake Atna down the Matanuska Valley. While it has long been recognized that Lake Atna occupied ≥9000km 2 of south-central Alaska's Copper River Basin, little attention has focused on the lake's discharge locations and behaviors...
Late Pleistocene glaciers around Darhad Basin advanced to near their maximum positions at least three times, twice during the Zyrianka glaciation (at ∼17–19 ka and ∼35–53 ka), and at least once earlier. The Zyrianka glaciers were smaller than their predecessors, but the equilibrium-line altitude (ELA) difference was <75 m. End moraines of the Zyrianka glaciers were ∼1600 m asl; ELAs were 2100–2400 m...
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