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贵阳乌当中、晚奥陶世地层,最早由乐森碍研究,1959年发表了该地的剖面及一个珊瑚贵阳扭心珊瑚(=贵阳乐氏珊瑚)。1965年,林宝玉报道了贵阳乌当黄花冲中奥陶统剖面和一些珊瑚化石。南京地质古生物研究所测制了黄花冲剖面,将下奥陶统与下志留统之间的地层命名为黄花冲组,时代属中奥陶统,并认为缺失晚奥陶世地层。贵州108地质队在黄花冲剖面,发现了晚奥陶世地层的存在,命名为龙井组。
The Wudang Middle and Late Ordovician strata in Guiyang were firstly studied by Lesen. In 1959, the section of the site and the coral (Guiyang Le corals) were twisted. In 1965, Lin Baoyu reported on the Middle Ordovician section of Huanghuazhong, Wudang, Guiyang and some coral fossils. The Nanjing Institute of Geology and Palaeontology has measured the profile of the Huanghuachong, named the Huanghuachong Formation between the Lower Ordovician and the Lower Silurian, and belongs to the Middle Ordovician Period. The Late Ordovician strata are believed to be missing. Guizhou 108 geological team in the Huanghua Chong section, found the existence of Late Ordovician strata, named Longjing Formation.