(Table 1) Distribution of calcareous nannofossils in ODP Hole 117-723A
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Species abundance: A = abundant (1-10 specimens per field of view at 1500 X=, C = common (1 specimen per 2- 10 fields), F = few (1 specimen per 11-100 fields), R = rare (1...
物种丰度(Species abundance)判定标准如下:A为优势(abundant),指1500倍观测视野下每视野可见1~10个标本;C为常见(common),指每2~10个视野可见1个标本;F为少见(few),指每11~100个视野可见1个标本;R为稀有(rare),(1...



