the lower middle cambrian
the lower middle cambrian
中寒武纪下
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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Vertically, 3sets of source rocks including the Lower Cambrian, the Middle-o-Upper Ordovician-Lower Silurian and the Permian were developed in Chinese Paleozoic Marine basins.
研究认为中国古生代海相盆地在纵向上主要发育下寒武统、中上奥陶统—下志留统和二叠系3套烃源岩。
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