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Geology tracks eruptions, earthquakes, erosion, extinctions & more
Date:7/12/2013

rbara, 1006 Webb Hall, MC 9630, Santa Barbara, California 93106-9630, USA. First published on 11 July 2013, http://dx.doi.org/10.1130/G34387.1.

This study presents an innovative approach for reconstructing past sea level using intertidal microbial mats from Baffin Bay, Texas. Intertidal microbial mats are commonly found in arid regions wherein most sea-level proxies only have meter-scale precision. Studying past sea level is necessary for understanding how the coastline may respond to future change in sea level expected over the next century. 95% of all 1,297 microbial mats surveyed in Baffin Bay where found to live within 29 cm of mean sea level. Therefore buried microbial mats were used to determine past sea level within a 29 cm range for the last 5,000 years. The 29 cm precision of intertidal microbial mats to past sea level is much better than the typical precision of sea level proxies used within arid regions.


Rapid pulses of uplift, subsidence, and subduction erosion offshore Central America: Implications for building the rock record of convergent margins
Paola Vannucchi et al., Royal Holloway, University of London, Egham, Surrey TW20 OEX, UK. First published on 11 July 2013, http://dx.doi.org/10.1130/G34355.1.

Paola Vannucchi and colleagues describe the impact of the subduction of a high "mountain chain" on the margin of the overriding plate. A detailed record of the last 2.5 million years has been preserved in the sedimentary sequence drilled and recovered in 2011 by IODP Exp. 334. Reading this record and its correlation with the architecture of the margin as it appears today has allowed us to reconstruct the phases of disruption and how the margin is trying to heal through building deep, fast filling sedimentary basin on the forearc.


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

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