The Changxing Formation in the northeastern Sichuan Basin is in a marine environment, and can be divided into a carbonate platform sedimentary system and a basin sedimentary system based on sedimentary characteristics.

• 四川盆地东北部长兴组(大隆组)为海洋环境的产物,根据沉积特点,可以分为碳酸盐台地沉积体系和盆地沉积体系。