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Geology covers multiple disciplines and substantial territory in April's new postings
Date:4/18/2013

have had a particular impact on organisms directly dependent on primary producers as their main food source, such as suspension-feeding bryozoans. Cheilostome bryozoans are thought to be more nutrient-demanding than cyclostome bryozoans and, consequently, it is expected that cheilostomes would suffer the most from a reduced food supply. It has previously been suggested that cyclostome bryozoans thrived following the mass extinction event. However, data in this study by Caroline Sogot and colleagues show no such trend across the Cretaceous-Paleogene boundary. The dominant growth form of bryozoans was seen to change after the mass extinction event but not in the way predicted by a primary productivity crash. These results are consistent between Denmark and the Southeastern USA, which suggests that this is a global response. This study therefore questions the primary productivity crash hypothesis, or at least the extent to which this kill mechanism influenced suspension feeders at the Cretaceous-Paleogene mass extinction event.


Intermediate-depth earthquakes facilitated by eclogitization-related stresses
Junichi Nakajima et al., Research Center for Prediction of Earthquakes and Volcanic Eruptions, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan. Published online ahead of print on 4 April; http://dx.doi.org/10.1130/G33796.1.

This article by Junichi Nakajima and colleagues answers an untested hypothesis that the large volume reduction during eclogite formation should produce a paired stress regime along the eclogitization reaction front in which tension is underlain by compression. Nakajima and colleagues reveal that in an isolated, tiny seismic cluster tensional earthquakes lie 1 km above compressional earthquakes. This observation provides seismic evidence for the crucial roles of volume-change related stresses as viable processes for nuclea
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Contact: Kea Giles
kgiles@geosociety.org
Geological Society of America
Source:Eurekalert

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