The ages of the two faunas of late Oligocene in the bottom of the section were 26Ma and 25.5Ma.
剖面底部两个晚渐新世动物群的年代分别为26Ma和25.5Ma。
参考来源 - 新疆准噶尔盆地北缘第三纪磁性地层学·2,447,543篇论文数据，部分数据来源于NoteExpress
N-COUNT-COLL Animals, especially the animals in a particular area, can be referred to as fauna. (尤指某区域的) 动物群 [技术]
...the flora and fauna of the African jungle.
…非洲丛林的植物群和动物群。
Unless smokers are consistently located near more hospitable warm-water vents, chemosynthesis can account for only a fraction of the vent faunas.
除非烟囱始终位于更适宜的暖水喷口附近，否则化学合成只能占喷口动物群的一小部分。
Most deep-sea faunas rely for food on particulate matter, ultimately derived from photosynthesis, falling vent would dwarf any contribution from advection.
大多数深海动物依靠颗粒物质作为食物，这些颗粒物质最终来自于光和作用，下降的排放口会使平流的作用相形见绌。
We shall appreciate this difficulty more clearly, by looking to certain existing faunas and floras.
通过观察某些现存的动物群和植物群，我们就能更清楚地了解这种困难了。
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