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近年来鸡西含煤盆地早白垩世海相沟鞭藻及早期被子植物化石的不断发现，为确认城子河组及其下伏滴道组、上覆穆棱组的时代属早白垩世提供了重要的依据。通过海相及海陆交互相生物地层研究，恢复晚中生代黑龙江省东部古地理格局，为扩大找煤远景等提供了新的基础资料。
In recent years, the continuous discovery of the Early Cretaceous Daphniphyllum algae and early angiosperm fossils in the Jixi coal-bearing basin has confirmed the existence of the Early Cretaceous in the Chengzihe Formation and its next drip-line formation. The basis. Through the study of the marine facies and the sea-land interaction phase biostratigraphy, the paleogeographic pattern of the eastern Mesozoic Heilongjiang Province was restored in the late Mesozoic, providing new basic information for expanding the prospect of coal prospecting.