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华北地区山西组与太原组的分界,以太原西山地区研究最详。自1922年以来,中外学者曾相继发表过许多论著。在1959年全国地层会议上,也曾依据充足的地层古生物资料,将上石炭统太原组顶界确立在东大窑灰岩之顶(即北岔沟砂岩之底)。1975年华北区二叠系专题会议期间,重新作了实地观察与讨论,仍将石炭系顶界定于东大窑灰岩(或海相层)之顶。
The dividing line between the Shanxi Formation and the Taiyuan Formation in North China is the most studied in Taiyuan Xishan area. Since 1922, Chinese and foreign scholars have published many works in succession. At the 1959 National Stratum Conference, the top boundary of the Upper Carboniferous Taiyuan Formation was also established at the top of the limestone of Dongda Kiln (the bottom of Beichachagou sandstone) on the basis of adequate stratigraphic and paleontological data. In 1975, during the Permian Symposium in North China, a series of field observations and discussions were made again to define the top of the Carboniferous to the top of the limestone (or sea phase) of Dongdahiyao.