Yenan series
... 黄棕色红壤 yellowish brown lateritic soils 延安统 Yenan series 延长统｛早下侏罗统｝ Yenchang series ...
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灵武煤田的中侏罗统延安组含煤岩系为一湖泊三角洲沉积。
The middle Jurassic series Yanan Formation of in Lingwu coalfield is a lacustrine deltaic deposit.
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