A set of coal-bearing formation developed in the lower-middle Jurassic on the southern Altyn tagh in the western Qaidam Basin.

• 柴达木盆地西部阿尔金山前中、下侏罗统暗色含煤地层发育,对其沉积及展布特征认识不够是导致该区侏罗系油气勘探停滞不前的主要原因。