1～35微米大小的碳酸钙质化石。包括颗石藻类所产生的颗石及与其相似的化石，也包括与颗石化石共生并且大小相近，但形状不同，归属不明的绝灭类别如白垩纪的微锥石类与第三纪的盘星石类等。
出现有“海相”沟鞭藻、有孔虫和钙质超微化石是由于当时湖泊咸化及富养料造成的。
The presence of the "Marine" Dinophyceae, foraminifera and calcareous ultramicrofossils are attributed to the salinized lakes and abundant nutrients.
通过对南海表层沉积中钙质超微化石丰度和属种组合的分析，得出化石丰度与水深的关系。
Based on the analyses of abundance and assemblages of calcareous nannoplankton of the surface sediments from the South China Sea, the correlation between the abundance and water depth is found.
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