(Table 1) Occurrence chart of diatom species in ODP Hole 121-752A
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species abundance: A = abundant (at least 20 specimens are presented in one horizontal traverse at 500 X), C = common (19-3 specimens), F = few (1-2 specimens), R = rare (less...
物种丰度（species abundance）分级标准如下：A为丰富级，即在500倍放大的单条水平样带中至少存在20个标本；C为常见级，对应3~19个标本；F为少量级，对应1~2个标本；R为罕见级，标本数量少于……
