(Table 8) Distribution of calcareous nannofossils in ODP Hole 124-771A

species abundance: W = very abundant (>70 % of a rich assemblage), A = abundant (>10 specimens per field of view at 1500 X), C = common (1-10 specimens per field), F = few (>7 specimens in entire scanning area), R = rare (3-6 specimens in entire scanning area), X = very rare (1-2 specimens in entire scanning area)物种丰度（species abundance）：W = 极丰富（占丰富物种群落的70%以上）；A = 丰富（1500倍放大视野下，单视野内标本数＞10）；C = 常见（单视野内标本数1~10）；F = 偶见（整个扫描区域内标本数＞7）；R = 稀有（整个扫描区域内标本数3~6）；X = 极稀有（整个扫描区域内标本数1~2）