三门系的研究历史和现状我们只要系统地阅读有关三门系的文献,便不难看出,从1918年三门系命名建组迄今,其时代划分与对比始终没有取得一致的认识。然而,自1959年召开三门峡现场会议以来,多数学者倾向于把三门系与泥河湾组并列,做为我国第四纪初期地层的对比标准,从 The History and Current Situation of Sanmen Studies As long as we systematically read the literature on Sanmenism, it is easy to see that the division and contrast of Sanmenism from 1918 to the present has not been consistently recognized. However, since Sanmenxia site meeting was held in 1959, most scholars tend to tie the Sanmen and Nihewan formations as the contrasting standard of the early Quaternary strata. From