The genera and species of diatoms in the samples from Tianyang and Jiudouyang vary with increasing buried depth from Melosira to StePhanodiscus, and than to Cyclotella.

• 九斗洋和田洋钻孔作品中硅藻种属随深度而变化，由直链藻到冠盘藻，直到小环藻。