中侏罗世早期是全区重要的成煤期，下窑坡组为湖泊—三角洲及沼泽相。
The early Middle Jurassic was an major coal-forming period in the region, when the Lower Yaopo Formation of lacustrine-deltaic and swamp facies was deposited.
本文着重讨论燕山早期主体花岗岩，即中侏罗世三江口序列。
This paper mainly discusses early Yanshanian granites, namely, the Middle Jurassic Sanjiangkou sequence.
新的化石表明美蝎蛉的早期分异在中侏罗世就已存在。
The new material from China reveals that the early diversification of eomeropids with cockroach-like body was well underway by the Middle Jurassic.
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