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在浙江临安板桥早奥陶世的留下组、施家头组和荆山组中发现较丰富的牙形刺动物群,自下而上建立Cordylodus angulatus带、Chosonodina herfurthi带、Paltodus deltifer带、Paroistodus proteus带和Prioniodus elegans带等5个牙形刺带,均属于早奥陶世。研究表明,临安板桥一带的早奥陶世碳酸盐岩地层时代局限于早奥陶世特马豆克期—弗洛期,与上覆中奥陶世达瑞威尔期硅质泥岩呈假整合接触关系,其间缺失弗洛晚期—达瑞威尔早期沉积。这一发现对该地区的地层划分对比和古地理研究具有重要意义。
In the Leaving Group of Early Ordovician in Banqiao, Lin’an, Zhejiang Province, abundant conodonts were found in the Shijiantou and Jingshan formations, and Cordylodus angulatus, Chosonodina herfurthi, Paltodus deltifer, Paroistodus proteus and Prioniodus elegans with 5 other conodont spines, belong to the Early Ordovician. The study shows that the age of the Early Ordovician carbonate strata in Banqiao, Lin’an is limited to the Early Ordovician Temasek-Florian period and is falsely integrated with the overlying Ordovician Darwarian siliceous mudstone The contact relationship, in the meantime, was late in the Flo-sedimentation of Darfur. This finding is of great significance to stratigraphic division and palaeogeography research in this area.