(Table 7) Oligocene-Miocene diatom biostratigraphy of ODP Hole 120-747A
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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 =...
R = 稀有(rare):使用40倍物镜(40X objective)与10倍目镜(10X ocular)观察时,在5~20个视野内仅能发现某一特定物种的1个标本;F = 常见(frequent):每5个视野内即可见1个该物种的标本;C = ……



