【作者】 汪炳浩； 方炳兴；

【Author】 Wang Bing-hao;Fang Bing-xing;Regional Geological Surveying Team,Geological Bureau of Zhejiang Province;

【机构】 浙江区域地质调查队；

【摘要】 <正>浙江西部杭州、富阳、桐庐、建德、兰溪、衙州和江山等地二叠系的划分和对比,自1951年盛莘夫自下而上将其划分为栖霞灰岩、茅日灰岩、丁家山层、"礼贤煤系"和长兴灰岩以后,李星学(1959)、浙江区测队(1959-1975)、赵金科(1977)、浙江省区域地层表编写组(1979)等先后作过研究,由于对栖霞组的含义和"礼贤煤系"的时代归属没有取得一致意见,加以地质构造复杂,岩性和厚度在各地有较大的变化,目前认识尚未统一。不同划分方案如表I所示。最近,笔者对二十万分之一区域地质调查已取得的资料作了综合分析,观察了原有剖面,还发现了四条较好的剖面,补充搜集了古生物标本、地层层序及横向变化的资料,对二叠系底界做了一些工作。更多还原

【Abstract】 Based on results from making map on the scale of 1:200000,a new understanding has been obtained in the following points:1.In western Zhejiang,there exists no Liangshan Formation.The Boundary of Carboniferous and Permian should be drawn between the Sphaeroschwagerina Zone and the Schwagerina tschernyschewi Zone.The Upper Member of the Chihsia Formation is characterized by the Misellina claudiae-Orthotichia chekiangensis Assemblage and the Lower Member is represented by Schwagerina tschernyschewi and Stepanoviella,corresponding to the Misellina claudiae Zone and the Schwagerina tschernyschewi Zone of the Chihsia Formation in Nanjing area respectively.2.The type locality of the newly established Dahuishan Formation is situated on the southeastern slope of the Dahuishan Mountain at Zhinan of the Tonglu county.This formation is mainly composed of limestone with cherty nodules and 495 m in thickness.The fossils are dominated by Canellina in association with Pseudoliolina,Farafusulina,Yangchienia,etc.,belonging to the Cancellina Zone.3.In this paper,the authors follow the opinion of Zhao Jin-ke and others(1977),using the name of "Tingchiashan Formation" to represent the uppermost horizon of the upper part of the Lower Permian in the studied area.In this formation,the Lower Member yields Tongluceras and Erinoceras,and the Upper Member yields Shouchangoceras,Polydiexodina and the Gigantopteris nicotinaefolia Flora.4.Taking the base of the conglomerate as the dividing line,the ’Lihsien Coal measures’ were separated into two parts,with the upper part assigned to the Lower Permian Tingchiashan Formation,and the Lower part to the Upper Permian Lungtan Formation.5.Around the Zhengtang area of the Jiangshan county and Dazhou of the Quzhou city,the occurrence of the Permian-type brachiopod Waagenites in the Claraia Zone at the basal part of the Lower Triassic Zhengtang Formation indicates the continuity of the P-T boundary in this area.更多还原