内蒙古大青山地区早古生代三叶虫的发现

THE DISCOVERY OF THE EARLY PALEOZOIC TRILOBITE IN DAQINGSHAN, INNER MONGOLIA

述描述了采自内蒙古大青山地区以断块状分布的白云岩、白云质灰岩中的三叶虫化石 3个属、2个种和 2个未定种。即LuaspideslingyuanensisDuan ,L .sp .,Manohuriellamacar(Walcott)和Pseudasaphussp .。虽然它们均是已知属种 ,但在该地区是首次发现。由此可以确定这套以角度不整合覆盖于古老变质岩之上的白云岩、白云质灰岩为主的沉积地层其层位属下古生界 ,时代最晚为毛庄期开始沉积。该发现解决了该套地层时代的归属问题 ,同时对于区内古生界和元古界划分对比具有重要意义。

There are 3 genera with 2 species and 2 indeterminata species, namely Luaspides lingyuanensis Duan, L. sp., Manchuriella macar (Walcott), Pseudasaphus sp., of early Paleozoic trilobite have been discribed in the paper, which discovered in a series strata of dolomite and dolomitic limestone in Daqingshan region. The fossils are not new species, but the first discovery in this region. The discovery of the trilobite can give a certain evidence that the strata of dolemite unconformited on the metamorphic rocks is early Paleozoic. The beginning time of the strata sedimentation was early than Maozhuang stage. The discovery in this region has great significance for the classification and correlation of the Proterozoic and early Paleozoic strata.