(Appendix B) Stratigraphic range and relative abundance of Neogene planktonic...

Species abundance: A = abundant (>25%), C = common (16-24%), F = frequent (6-15%), R = rare (1-5%), - = absent, based on a random sample of 200-400 specimens from the >63...

物种丰度（Species abundance）分级标准如下：A为优势类群（abundant，占比＞25%），C为常见类群（common，占比16%~24%），F为频见类群（frequent，占比6%~15%），R为稀见类群（rare，占比1%~5%），符号"-"代表未出现类群（absent）；该分级基于从超过63个……中随机抽取的200~400份标本得到的统计结果。