Pre-carboniferous前石炭纪 On the basis of understanding the palaeo-geologic maps, and choosing the tuff from the first bottom bed of the Sub-membe...
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这导致在距今2.8到3.4亿年前的石炭纪大气中的氧气几近饱和。
This eventually resulted in the oxygen-rich atmosphere of the Carboniferous period around 340 to 280 million years ago.
在30亿年前的石炭纪时代，大陆被热带雨林覆盖，并由爬行动物所统治。
The new research is focused on the Carboniferous Period, when the supercontinent of Pangea was covered in tropical rainforests ruled by reptiles.
地表地质调查和人工地震勘探结果证实，石炭纪以来最早的区域性角度不整合发育于白垩系与前白垩纪地层之间。
Field surveys and seismic exploration show that the lowest regional angular unconformity older than the Carboniferous developed between the Cretaceous and the pre-Cretaceous strata.
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