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系统整理了以往多个 1∶5万、1∶2 0万区调图幅内地层剖面的生物地层资料 ,结合野外追索 ,利用生物地层 (化石带 )的近似等时性 ,对鲁西地区寒武系中部的二级层序界面进行重点研究。认为该界面赋存在馒头组下页岩段或洪河段与馒头组上页岩段或张夏组下灰岩段之间 ,在鲁西地区普遍存在 ,延伸稳定 ,自西北向东南由假整合→似整合过渡 ,并在西部地区出现明显的沉积间断。界面类型属Ⅱ型不整合。
In the past, the biostratigraphy data of previous stratigraphic profiles in 1: 50000, 1: 20000 regional maps were systematically collected. Based on the approximate isochronism of the biogenic strata (fossil zones) The second order sequence interface in the central Cambrian is mainly studied. It is believed that this interface exists between the lower shale of the Mianmao Formation or the upper shale of the Honghe and the Mantou Formation or the lower limestone of the Zhangxia Formation and is widespread in the Luxi area and extends steadily. From the northwest to the southeast, → Seemingly integrative transition, with obvious sedimentary discontinuities in the western region. Type of interface is type II unconformity.