(Table 12) Eocene-Oligocene diatom biostratigraphy of ODP Hole 120-749B

R = rare ( one specimen of a particular species encountered in 5-20 fields of view using a 40X objective and 10X ocular), F = frequent (one specimen in every 5 fields), C = common (one specimen in every field), A = abundant (more than one species in every field), X = present, - = absent

R = 稀有（rare）：使用40X物镜与10X目镜观测时，在5-20个视野范围内仅能观测到某一特定物种的1个标本；F = 常见（frequent）：每5个视野可观测到1个该物种标本；C = 普遍（common）：每个视野可观测到1个该物种标本；A = 丰盛（abundant）：每个视野内可观测到多个物种；X = 存在（present）；- = 缺失（absent）