In the Es1 Formation in Qikou Sag, the interlaminated coccolith limestone and mudstone develops extensively, in some literature, it is classified as "oil shale" because of the oil bearing.
歧口凹陷古近系沙河街组一段广泛发育颗石灰岩与泥岩的纹层状互层，因其含油而被误认为“油页岩”。
In the Es1 Formation in Qikou Sag, the interlaminated coccolith limestone and mudstone develops extensively, in some literature, it is classified as "oil shale" because of the oil bearing.
歧口凹陷古近系沙河街组一段广泛发育颗石灰岩与泥岩的纹层状互层，因其含油而被误认为“油页岩”。
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