论浙江北部早二叠世硅质岩层

The Early Permian silicolites in Northern Zhejiang

长期以来对浙江北部早二叠世硅质岩层的划分与对比一直存在着分歧。在硅质岩层里发现了栖霞希瓦格动物群和一些有孔虫类化石。根据这些，浙北地区的早二叠世硅质岩层应归属栖霞组，相当于江苏宁镇地区的栖霞组上硅质岩段。

The present paper deals with the depositional feature of the silicolites and the Early Permian 'Qixia Formation' in Northern Zhejiang. The silicolites are widespread in Northern Zhejiang, usually overlie the 'Qixia Formation' and underlie the Gufeng Formation of Maokou stage. From the silicolites a great number of the fusulinids,which contain Schwagerina chihsiaensis Chen , Schwagerina var. regularis Chen,Schwagerina chihsiaensis var.brevis Chen,Schwagerina aff.solida (Colani),Schwagerina sp., etc. were collected and are associated with a few foraminifers. According to the new records of fusulinids, the silicolites properly belong to tile upper part of the Qixia Formation, probably equivalent to the Upper Silicolite Member of the Qixia Frmation in the Nanjing-Zhenjiang area, Jiangsu Province.