Shuwen Dong and colleagues conducted deep seismic-reflection surveying across the Jurassic Daba Shan thrust belt of central China to investigate how and why the continued convergence between north and south China lasted ~50 million years after the Triassic closure of their intervening oceans. This study, together with surface geology, gravity surveying, and magnetic observations, indicates widespread occurrence of mafic plutons below the Daba Shan thrust belt. Dong and colleagues propose that subduction of dominantly eclogitized mafic crust of northern south China provided the driving force for continued convergence between north and south China after ocean closure.
Biogeographical and ecological patterns in bryozoans across the Cretaceous-Paleogene boundary: Implications for the phytoplankton collapse hypothesis
Caroline E. Sogot et al., Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, UK; and Department of Earth Sciences, Natural History Museum, Cromwell Road, London SW7 5BD, UK. Published online ahead of print on 4 April; http://dx.doi.org/10.1130/G34020.1.
The Cretaceous-Paleogene mass extinction had a significant impact on Earth's biota. The kill mechanism at this event is commonly hypothesized to be a global collapse in primary productivity. This would
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Geological Society of America