西大山组是一个向上变浅的沉积序列，沉积环境由次深海过渡为台前斜坡；
Xidashan Formation is a upward shallowing sedimentary sequence, whose sedimentary environment changed from bathyal environment to fore-platform slope.
庙河型生物群的产出位于晚期开阔台地向深水陆棚-次深海过渡相区中的黑色页岩、硅质页岩中，其沉积环境为最大浪基面以下的宁静、贫氧环境，其沉积方式为悬浮沉积。
The Miaohe-type biotas occur in the black shale and siliceous shale in the transitional areas from the late open platform facies to deep-water shelf-bathyal facies.
上三叠统在南、北坳陷为次深海盆地相沉积，发育一套黑色页岩烃源层；
The Upper Triassic Formation is sub-abysmal basinal facies deposit in the south and north depressions. A black shale layer developed.
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