Biostratigraphic datums from DSDP Site 31-296
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The numerical age estimates follow the Geologic Time Scale 2012 (Gradstein et al. 2012), except for one nannofossil biohorizon (paracme end; Reticulofenestra pseudoumbilicus),...
本数据集的数值年代估算结果均遵循2012版地质年表(Geologic Time Scale 2012)及Gradstein等(2012)的研究成果,仅一处超微化石生物地层界线(丰度次峰值终止点;假脐状网球石(Reticulofenestra pseudoumbilicus))的年代处理除外,



