Braided arenaceous fluvial channels were developed, and paludal coal-bearing sediments were well developed from Yan 9 to Yan 4 + 5 substage in the western part.
延9至延4 +5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。
Braided arenaceous fluvial channels were developed, and paludal coal-bearing sediments were well developed from Yan 9 to Yan 4 + 5 substage in the western part.
延9至延4 +5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。
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