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Date:11/14/2012

onstrates that Earth's oceans quickly returned to habitable conditions and were then driven back to anoxia several times during the Early Triassic. This caused several failed attempts by life to recover until the age of the dinosaurs finally began. The cause of these repeated stresses remains uncertain, but Grasby and colleagues point to evidence for a series of major volcanic eruptions during that time. They suggest that emissions of volcanic gases in addition to nutrients and toxins could have had significant and repeated impacts on the global ecosystem.


Rapid Pliocene uplift of Timor

N. Nguyen et al. (J. Shulmeister, corresponding), School of Geography, Planning and Environmental Management, University of Queensland, St Lucia, 4072 QLD, Australia. Posted online 13 November 2012; doi: 10.1130/G33420.1.

Changes in vegetation from coastal mangroves to montane forest are used to record the emergence of Timor from the sea and to track the uplift of the island from sea level to over 2000 m above sea level. The island started to emerge soon after 4.5 million years ago, but the uplift dramatically accelerated after 3.1 million years ago to rates of 2-5 mm per year. The emergence of Timor is earlier than Indonesia to the west, but follows the same pattern. The uplift of Timor is closely associated with the constriction of the Indonesian through flow. This study helps constrain both the nature of tectonic activity in this region and also reinforces understanding of the causes of climate change in the last three million years, including the timing of development of a modern El Nio Southern Oscillation (ENSO) system.


Drainage capture and discharge variations driven by glaciation in the Southern Alps, New Zealand 1

Ann V. Rowan et al., School of Earth, Atmospheric and Environmental Sciences, University of Manchester, Manchester M13 9PL, UK. Posted online 13 November 2012; doi: 10.1130/G33829.1.

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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert  

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