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

dicates that carbonation and laterization represent complementary records of meteoric water infiltration. Taken together, these results suggest a scenario in which synlaterization tectonic activity has enhanced water infiltration through the nappe, leading to widespread carbonation of the serpentine sole. This calls for renewed examination of other magnesite-bearing ultramafic nappes worldwide in order to establish whether active tectonics is commonly a major agent for carbonation.


Testing the use of microfossils to reconstruct great earthquakes at Cascadia
S.E. Engelhart et al. -- B.P. Horton, corresponding: Sea Level Research, Institute of Marine and Coastal Sciences, School of Environmental and Biological Sciences, Rutgers University, New Brunswick, New Jersey 08901, USA. Published online ahead of print 30 July 2013, http://dx.doi.org/10.1130/G34544.1.

In 1700, a massive earthquake struck the west coast of North America. Though it was powerful enough to cause a tsunami as far as Japan, a lack of local documentation has made studying this historic event challenging. In a study lead by S.E. Engelhart, Benjamin Horton, Professor in the Institute of Marine and Coastal Science at Rutgers University, and colleagues have helped unlock this geological mystery using a fossil-based technique. Their work provides a finer-grained portrait of this earthquake and the changes in coastal land level it produced, enabling modelers to better prepare for future events. The Cascadia Subduction Zone runs along the Pacific Northwest coast of the United States and up to Vancouver Island in Canada. This major fault line is capable of producing megathrust earthquakes 9.0 or higher, though this trait was only discovered within the last several decades from geology records due to a dearth of observations or historical records. The Lewis and Clark expedition would not make the first ex
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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