(Table 2) Distribution of calcareous nannofossil species at DSDP Hole 25-245A

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Abundance - V = very abundant, (more than 10 specimens/field of view); A = abundant, (1 to 10 specimens/field of view); C = common, (1 specimen/2-10 fields of view); F = few, (1...

丰度（Abundance）分级标准如下：V = 极丰富，即单视野内标本数量超过10件；A = 丰富，即单视野内标本数量为1~10件；C = 常见，即每2~10个视野内可见1件标本；F = 稀少，(1...