(Table 6) Distribution of calcareous nannofossils in ODP Hole 117-728A

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）分级规则如下：A = 丰富（abundant），指1500倍放大视野下单个视野内可观测到1~10个标本；C = 常见（common），指每2~10个视野内可观测到1个标本；F = 稀少（few），指每11~100个视野内可观测到1个标本；R = 稀有（rare），原文此处内容未完整给出（原文结尾为(1...)）