Daily Science Report 29 -- Sunday, 9 January 2011
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Today’s Cores U1374A-17R through -23R (87.2-120.8 mbsf) continued to recover volcaniclastic breccia with 86% recovery. So far, 12 lithologically different volcanic clast types have been identified. Occasionally (e.g. in Core U1374A-21R), large bioclasts, such as complete bivalve shells, are found, providing evidence that this material has been reworked under submarine conditions. Meanwhile, the shipboard investigation of the 10 cm thick fossil-rich limestone that was recovered in Core U1374A-3R, above the first lava flow at this site, is nearly completed. The identified fossils include benthic and planktonic foraminifera, sea urchin spines, bivalve fragments and bryozones. The occurrence of double-keeled planktonic foraminifers (confined to Turonian through Maastrichtian ages) proves that volcanism at Site U1374 ceased in the late Cretaceous.
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