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Xuanwei Formation
宣威组
底部与下伏地层峨眉山玄武岩整合或假整合接触,顶部与上覆地层仙关组整合接触的一套以陆相沉积为主,有少量海相夹层的黄色和灰绿色细砂岩、粉砂岩、黏土岩、页岩及煤层,偶夹菱铁矿的岩层。
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