生物面（biosurface,biohorizon）是指其上、下生物地层特征有重要而显著变化的一个面，或本身具独特生物地层特征的一个薄层。它可相当于两个生物带的界线面，也可见于一个生物带的内部。
一方面，有微小的微生物，只有在显微镜下才能看到它们。
On the one hand, there are tiny microbes and they can only be seen through a microscope.
另一方面，商业上来说，我们有潜力大量生产生物乙醇，供全世界使用。
And commercially because we have the potential to produce large amounts of bioethanol viably across the world.
另一方面，那些生物可能太微小不容易被过滤器捕捉到。过滤器用于实验开始时把生物从水中筛选出来以便进行分析。
On the other hand, those creatures might just be too small to be caught easily by the filters used to winnow life from water for analysis in the first place.
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