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Mistaken point, Sanctuary of Zeus, catastrophic outburst floods, shocked sand grains
Date:2/20/2014

, BC, V8P 5C2, Canada. Posted online ahead of print on 13 Feb. 2014; http://dx.doi.org/10.1130/B30935.1.

How was Earth's most recent supercontinent constructed? While Earth Scientists agree that all of Earth's continents came together to form Pangea 350 million years ago, there is little consensus with regard to how and why. The role of the Iberian Peninsula remains particularly controversial. An ancient mountain range spanning Spain and Portugal records a continental collision involved in the formation of Pangea, but what exactly was colliding with what? Was Iberia its own small continent derived from South America? A part of continental Africa? In this study, Ph.D. candidate Jessica Shaw and her colleagues at the universities of Victoria, British Columbia, and Salamanca, Spain, used geologic forensics to address this controversy. By age-dating large numbers of zircon grains contained within sedimentary rocks, one can construct a sedimentary "fingerprint" unique to a particular time and region. Shaw and her colleagues discovered a perfect match between 470 million year old Iberian sandstones and equal-aged sandstones from northeast Africa and Arabia. These findings show that Iberia formed a portion of an Atlantic-style African passive margin that faced north towards the ocean whose closure heralded the collisions that fused Pangea. Still unknown: when and how Iberia separated from Africa.


Ice dams, outburst floods, and glacial incision at the western margin of the Tibetan Plateau: A >100-k.y. chronology from the Shyok Valley, Karakoram
Dirk Scherler et al., Institute of Earth and Environmental Sciences, University Potsdam, 14476 Potsdam, Germany. Posted online ahead of print on 13 Feb. 2014; http://dx.doi.org/10.1130/B30942.1.

Catastrophic outburst floods from large glacier-dammed lakes ha
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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