论文部分内容阅读
本文牙形石发现于北京大兴黄村一钻井的白云质灰岩中。依化石证据,该地层相当于奥陶系下马家沟组。过去由于从未发现过奥陶纪化石,前人一直认为该地区缺失奥陶系。牙形石的首次发现对该地区地层的详细划分与对比,对古环境、古地理以及水文地质等方面的研提供了第一手资料。可建立化究 T.tangshanensis 石带,其面貌与华北地台其它地区类同,同属于华北牙形石动物地理区范畴。
In this paper, the conodont was found in the dolomitic limestone of Huangcun-I Drilling in Daxing, Beijing. According to fossil evidence, the formation is equivalent to the Ordovician Majiagou group. In the past, the Ordovician fossils were never discovered until now. The first discoveries of conodonts provided detailed information on the stratigraphic division and contrast in the area and provided first-hand information on paleoenvironment, palaeogeography and hydrogeology. Can be established to study T. tangshanensis belt, its appearance and other parts of the North China platform similarities, belong to the category of conodont in North China.