硬石膏层 meaning in Chinese

anhydrite formation

In middle and late periods of the early permian , the pre - caspian areas rose successively , the climate became dry , and the environment turned to be supratidal zone ( evaporitic environment ) , resulting in the spread sedimentation of salts and the formation of the salt sediment group ( the upper part of the lower permian ) which consists mainly of halite and anhydrite
早二叠世中后期由于持续构造抬升，盆地气候变得乾旱，海水变浅，潮上带蒸发环境发育，以致这一时期广泛发育盐类沉积，形成含盐层系，主要由盐岩和硬石膏层构成，并形成许多大小不等的盐丘构造。