The researchers studied how different types of rocks were formed in the Junggar Basin during the Jurassic period. They looked at seismic data, well logs, and core samples to figure out where the rocks came from. They found that deep-water lake mudstones and shallow-water gravel and sandstones were deposited in the basin. The basin had three main sources of rocks, which created three different sandstone bodies. In the Early Jurassic, there were three or two main parts to the deposition system. In the Middle to Late Jurassic, the system changed due to erosion, leading to shallower water depths over time.