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Ancient whale coprolites, fault slickensides, shergottites, Ediacara, and Cascadia
Date:7/31/2013

rge magnitude "megaflood" deposits immediately downstream of the Yarlung-Tsangpo River Gorge in the easternmost Himalaya. These data support the previous hypothesis that Tibetan lakes restrained by glacial ice and debris within the Yarlung-Tsangpo drainage episodically evacuated through this steep, narrow gorge. These extreme flood events were capable of transporting a considerable amount of material from steep channel-adjacent hillslopes, focusing erosion within the gorge. Although megaflood frequency remains unconstrained, these data support a mechanism to substantially contribute to the Quaternary erosion of the Yarlung-Tsangpo Gorge.


The role of multiple glacier outburst floods in proglacial landscape evolution: The 2010 Eyjafjallajkull eruption, Iceland
Stuart A. Dunning et al., Geography, Engineering and Environment, Northumbria University, Newcastle upon Tyne NE1 8ST, UK. Published online ahead of print 30 July 2013, http://dx.doi.org/10.1130/G34665.1.

In 2010, Eyjafjallajkull volcano in Iceland erupted, causing global disruption due to the dispersing ash cloud. Less well known are the series of floods (known by the Icelandic term "jkulhlaup") generated by the melting of parts of the volcano ice-cap. Stuart A. Dunning and colleagues had a unique opportunity to survey the flood routing prior to the flooding as monitoring indicated an imminent eruption, and to then return after the eruption ended. They used laser scanning and time-lapse camera imagery to create detailed 3D models of the landscape to quantify change. The jkulhlaups completely in-filled a lake at the foot of Gigjkull glacier with sediment totaling more than 17 million cubic meters -- enough to cover nearly 315 NFL pitches 10 m deep in a mix of ash, rock, and ice. Contrary to prior models assuming that the largest events dominate the proglacial landscape, much change occurred during a series
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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