In Bathonian , the northern and southern depression connects to a uniform basin with the falling of the central rise belt , and came to a stable evolution phase with carbonate deposit.

• 巴通期中央隆起带进一步下沉，南、北羌塘连成一个统一的拗陷盆地，从此沉积作用进入稳定发展阶段，形成稳定的碳酸盐岩台地沉积体系。