The allochthon consists of the Presinian,Sinian and Cambrian system.The autochthon comprises the Devonian and Carboniferous system.
推覆外来系为前震旦系、震旦系和寒武系,原地系为泥盆系和石炭系。
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For roughly 65 million years, basically the second half of the Devonian Period and the first half of the Carboniferous, insects existed and continued to evolve, but for some reason, they weren't preserved very often in the fossil record.
在大约 6500 万年的时间里, 基本上是泥盆后半期和石炭上半期,昆虫存在并继续进化,但由于某种原因, 它们在化石记录中的保存并不频繁。