The Upper Triassic Formation is sub-abysmal basinalfacies 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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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.
Chenliu formation is a new established lithostratigraphic unit standing for the sedimentation type of basinal littoral facies tract of early tertiary in Guangxi.