中、上奥陶统与下奥陶统之间在塔中低凸起区缺失下奥陶统大湾阶、牯牛潭阶和中奥陶统庙坡阶，为角度不整合接触，在其周围的满加尔凹陷、塔东低凸起及塘古孜巴斯凹陷则为连续过渡沉积；通过地层对比与沉积相分析，认为塔中地区中、晚奥陶世发育孤立碳酸盐台地，台地边缘发育粒屑滩、灰泥丘和骨架礁亚相；塔中地区中、晚奥陶世沉积演化经历了早奥陶世末－中奥陶世中期抬升暴露阶段和中、晚奥陶世（宝塔─临湘早期）孤立碳酸盐台地的发育阶段以及晚奥陶世临湘─五峰期碳酸盐岩和碎屑岩混积台地发育阶段。 , The upper Ordovician and Lower Ordovician lack of Lower Ordovician Devonian, 牯Niu Tam, and Middle Ordovician temple slopes in the lowstands of Tazhong, Manjar Sag, Tadong low Protuberance and Tongguzabasi Sag are continuous transitional deposits. Through the stratigraphic correlation and sedimentary facies analysis, it is concluded that the middle and late Ordovician in Tazhong area develop isolated carbonate platform, the edge of platform The development of middle and late Ordovician sediments in Tazhong area underwent the mid-late Ordovician (Pagoda ─ Linxiang early) isolated carbonate platform development stage and the late Ordovician Linxiang ─ Wufeng carbonate and clastic rock mixed stage development stage.