摘要
本区石炭系属扬子地层区下扬子地层分区镇江地层小区和江南地层分区修水—钱塘江地层分区常州—宣城地层小区的过渡地层。笔者自1989年7月至1991年11月在本区进行1∶5万区调工作时,对石炭系进行了较为详细的研究,获得一些新资料,现将地层学研究方面的某些进展作些介绍,供大家参考。
There are several questions about the Carboniferous System in the North of Maoshan Mt.Accord- ing to the new data of detailed research,the paper obtained some new knowledges on the existence of early Carboniferous sedimentation,the time of Laohudong dolomite Formation and the biostratigraphic characteris- tics of Huanglong and Cbuanshan Formation. The Early Carboniferous Formation is Gaolishan Formation which is composed of three members.The lower member is purple quartz sandstone characterized by intercalated mica lithic sandstone.The middle mem- ber is muddy siltstone.And the upper part is coarse-moderate-grained pebbly quartz sandstone.It can be cor- related with the known Gaolishan Formation in the vicinity.Because no standard fossil of Early Carbonifer- ous Epoch found in the area,its time still remains doubt. The authors have extracted some fossil samples from Laohudong Formation including Profusulinella sp.,Idiogsthodus delilatus and Glomospiranella sp.etc.The fo(?)il assemblage shows that the Laohudong For- marion has typical diachronous feature.Its sedimentation coul(?)inue from the Middle Carboniferous to Late Carboniferous Epochs in the area. The authors also find large amount of fossils of Fusulinida.coral,foraminifera and Conodontophorida, in Huanglong and Chuanshan Formations,especially,the Fusulinida has the important significance for the re- gional stratigraphic classification and correlation.
出处
《江苏地质》
1992年第2期86-91,共6页
Jiangsu Geology
