摘要
报道了采自于鄂西巴东县上三叠统沙镇溪组新层型剖面3种楔羽叶植物化石,即SphenozamitesmarioniCounillon,Sph.fenshuilingensisMeng和Sph.cf.changiSze。在分析秭归盆地上/中三叠系接触界面特征和化石组合带的基础上,指出盆地西缘上三叠统与下伏中三叠统为连续沉积,而东缘则呈假整合接触。依据黄陵穹隆东、西翼上三叠统的岩性特征、动植物化石和与下伏地层的接触关系,提出荆门-当阳盆地上三叠统王龙滩组和九里岗组可分别与秭归盆地沙镇溪组上部和中下部进行精细对比。
In recent years,some species of Sphenozamites have been found from the Neostratotype section of the Upper Triassic Shazhenxi Formation in the Badong County,western Hubei.They are Sphenozamites marioni Counillon,Sph.fengshuilingensis Meng and Sph.cf.changi Sze.On the basis of analysing the Upper/Middle Triassic contact relations and the fossil assemblage zones in the Zigui basin,it is concluded that the Upper Triassic Series is in a conformable contact with the underlying Middle Triassic Series in the western margin of this basin,but disconformable in the eastern margin of this basin.According to the lithological characteristics,fossil assemblage zones and stratigraphic contact relation of the Upper Triassic Series on the eastern and western limbs of Huangling dome,the Upper Triassic Wanglongtan and Jiuligang Formation in the Jingmen-Dangyang basin may be correlated respectively with the upper part and middle-lower part of the Shazhenxi Formation in the Zigui basin.
出处
《华南地质与矿产》
CAS
2003年第4期60-65,共6页
Geology and Mineral Resources of South China
关键词
上三叠统
地层对比
楔羽叶属
黄陵穹隆
鄂西
Upper Triassic Series
stratigraphic correlation
Sphenozamites
Huangling dome
western Hubei
