The coal-bearing rocks of the Falagou well field of Sunan County in the middle segment of the Qilianshan Mt.were composed of the Late Carboniferous shallow oceanic and continental sediments.

• 位于祁连山中段的肃南县法拉沟井田,含煤岩系为晚石炭世浅海型海陆交互相含煤建造。