The scientists studied the sedimentary rocks in Chalangla, Tibet to see if there is potential for oil and gas. They found two main types of rock: clastic and carbonate. These rocks are divided into 7 major types, like neritic and delta. The Upper Triassic rocks show a transition from marine to continental, while the Middle Jurassic rocks have a lot of neritic facies. The Upper Jurassic rocks are mostly marine to continental transition. Lower Cretaceous rocks have a restricted carbonate platform, and Upper Cretaceous rocks have piedmont alluvial fan facies.