Braided arenaceous fluvial channels were developed, and paludal coal-bearing sediments were well developed from Yan 9 to Yan + substage in the western part.
Braided arenaceous fluvial channels were developed, and paludal coal-bearing sediments were well developed from Yan 9 to Yan + substage in the western part.
延 9至延 +期网状砂质河道发育 ,西部地区广泛发育平原沼泽煤系沉积。