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二十年前,关于华北地台的上奥陶统是否存在,几乎一无所知。一般都认为华北地台无晚奥陶世的沉积。但是,近二十年来,在华北地台西缘的许多地区不断地发现了上奥陶统。这些发现对阐明华北地台古地理、海水进退和构造运动等方面都有重要意义。 1960前,王钰、穆恩之、卢衍豪曾提出华北地台可能有上奥陶统的看法。1960年,俞昌民根据陕西耀县(原文为富平县)、宁夏固原县产有与祁连山扣门子组相同种的珊瑚Catenipora uniforma(C.M.Yu),初步肯定含该化石的地层年代为晚奥陶世。1963年.
Twenty years ago, the existence of the Upper Ordovician on the North China platform was almost unknown. It is generally accepted that there is no sedimentation of late Ordovician in North China. However, in the past two decades, the Upper Ordovician has been continuously discovered in many parts of the western margin of the North China Platform. These findings are of great significance in clarifying paleogeography, seawater retreat and tectonic movement in North China. Before 1960, Wang Yu, Mu En, Lu Yanhao proposed that the North China platform may have the view of the Upper Ordovician. In 1960, according to Yu Changmin Yao County, Shaanxi Province (originally Fuping County), Ningxia Guyuan County has the same species of Qilianshan clanmen group Coral Catenipora uniforma (CMYu), initially identified with the fossil strata for the late Ordovician . 1963.