Distribution of late Turronian planktonic foraminifers in ODP Hole 114-700B

The oldest Cretaceous sediments in the subantarctic region were recovered from ODP Hole 700B in the East Georgia Basin. Planktonic foraminifers from the deepest indurated limestones could be attributed to the Marginotruncana schneegansi Zone of late Turonian age.

亚南极地区已知最古老的白垩纪沉积物，采自东乔治亚盆地内的大洋钻探计划（Ocean Drilling Program，ODP）700B钻孔。采自该钻孔最深处固结石灰岩中的浮游有孔虫，可归属于土仑晚期的Marginotruncana schneegansi生物地层带。