The Upper Triassic Formation is sub-abysmal basinal facies deposit in the south and north depressions. A black shale layer developed.
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 basin in ontology includes location of the basin in a natural sequence, its own system, geological events in the basin, and the basinal types, facies and models.
本体论的盆地包括盆地在自然序次中的位置、盆地自身系统、盆地中的地质事件，还包括盆地的类别、相和模式等。
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