(Table 6) Distribution of calcareous nannofossils in ODP Hole 139-856A@en

Species abundance: A = (abundant >10-100 specimens/field of view), C = common (1-10 specimens/field), F = few (1 specimen/2-10 fields), R = rare (1 specimen/11-100 fields).物种丰度分级如下：A级（abundant）为丰富型，视野内标本数为10~100个/视野；C级（common）为常见型，视野内标本数为1~10个/视野；F级（few）为稀少型，每2~10个视野可见1个标本；R级（rare）为稀有型，每11~100个视野可见1个标本。