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近年来在杭州附近余杭县荆山岭发现了壳相石灰岩的下奥陶统之后(鞠天呤,1979地层学杂志,3卷,4期),引起了地层古生物工作者的广泛注意,这是因为以前浙西、浙北下奥陶统除印渚埠组之外,均属宁国组笔石页岩相的地层。1979年秋笔者等去余杭及临安观察奥陶系,除系统地在荆山岭的“荆山群”中采集化石之外,还在临安高垟头于一套含鹦鹉螺的石灰岩之下,见有一层厚2.5米的黑色含碳硅质页岩,其中含有笔石(ADA10)Didymograptus ellesae Ruedemann,D.affinis Nicholson,Tylograptus sp.,Cryptog-
In recent years, after the discovery of the Lower Ordovician of the shell facies limestone in Jingshanling, Yuhang County near Hangzhou (Ju Tian Xin, Geomagnetism, Vol.3, No.4), widespread attention has been paid to the paleontologists in the strata because Before the western Zhejiang, northern Zhejiang, the lower Ordovician in addition to Yinchu Port Group, are Ningguo Formation penolith shale facies. In the autumn of 1979, the author went to observe the Ordovician in Yuhang and Lin’an. Apart from systematically collecting fossils in the “Jing Mountain Group” in Jingshanling, Lin’an Gaotitan was also under a set of limestone with nautilus. 2.5 m black carbonaceous siliceous shale containing ADI10 Didymograptus ellesae Ruedemann, D.affinis Nicholson, Tylograptus sp., Cryptog-