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宁夏北部沙巴台地区的太原组为海陆交互相和三角洲相沉积 ,可划分为 2个三级层序、 4个副层序组和 1 8个副层序。与华南海相沉积层序的对比表明太原组属晚石炭世 Gzhelian晚期至早二叠世 Artinskian中期。下二叠统 Asselian阶的底界 (即 C/P界线 )大体与太原组下部层序的初始海泛面一致 ,可广泛对比。
The Taiyuan Formation in the Shabaitai area in the northern part of Ningxia is a marine-continental interaction facies and deltaic facies deposition. It can be divided into two tertiary sequences, four secondary sequence groups and 18 secondary sequences. The comparison with the marine sedimentary sequence in South China shows that the Taiyuan Formation belongs to the middle stage of Artinskian from Late Gzhelian to Early Permian in the Late Carboniferous. The bottom boundary of the Lower Permian Asselian (ie C / P boundary) is generally consistent with the initial sea surface of the lower sequence of the Taiyuan Formation, and can be widely compared.