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根据岩石学特征、生物群组合及其生态类型、与下伏地层接触关系和指相微量元素特征,认为大隆组属局限台地相—陆棚相,是晚二叠世中晚期海水逐渐加深的沉积产物;其硅质岩形成于水体较浅的局限—半局限潮下带。
Based on petrological characteristics, biota assemblages and their ecological types, their contact with the underlying strata and the characteristics of trace elements, it is concluded that the Dalong Formation is a restricted platform facies-continental shelf facies, which is gradually deepening in late-Middle Permian seawater Sedimentary products; its silicalite formed in shallow water body - semi-confined subtidal zone.