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 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；
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