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Cover: Glacial meltwater atop the Bagley ice field in the St. Elias Mountains, Alaska. Water and ice flow are from upper right to lower left, perpendicular to pervasive stress fracturing. Recent warming has driven the glacier equilibrium line altitude (ELA) higher, and this location has become subject to extensive seasonal melting only in the last decade or so. Focused erosion near the shifting ELA exerts an important control on orogenic development. See, “Denudation and deformation in a glaciated orogenic wedge: The St. Elias orogen, Alaska” by Berger and Spotila, p. 523–526.
Photo by Aaron L. Berger
Cover design by: Eric Christensen
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