Bentonitic siltstone and bentonite-carbonate rock sedimentary deposit are aggraded as the top of Laogonggou stratum;
顶部为一套滨浅湖相的膨润土
粉砂岩-膨润土-碳酸盐岩沉积岩石组合。
；
积Bentonitic siltstone and bentonite-carbonate rock sedimentary deposit are aggraded as the top of Laogonggou stratum;
顶部为一套滨浅湖相的膨润土粉砂岩-膨润土-碳酸盐岩沉积岩石组合。
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