The Upper Triassic Formation is sub-abysmal basinal facies deposit in the south and north depressions. A black shale layer developed.
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.
Since the Permian, the Tarim Basin had undergone basinal extension, subduction and intro-continental orogeny.