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吉南地区的寒武纪生物化石（以三叶虫为主）极其发育，前人曾对其进行了详尽的研究，先后建立了７个阶１７个化石带。但化石带的含义不甚明确，多以标准分子为代表，即标准化石带（时间带？）。笔者等于１９９１～１９９３年在白山市幅（１／５万）区调填图时，以区内的青沟子剖面为例，利用前人在该剖面上连续采集的三叶虫生物化石资料，按照多重地层划分的原则，对生物地层单位进行了初步清理，建立了５个正式生物地层单位—延限带，６个非正式生物地层单位—含生物化石层。
The Cambrian fossils (mainly trilobites) in southern Kyrgyzstan are extremely developed. Former studies on them have been conducted, and 7 stages and 17 fossil zones have been established successively. However, the meaning of the fossil zone is not very clear, mostly represented by standard molecules, namely the standardized fossil zone (time zone?). The author is equal to the 1991 to 1993 in Baishan City amplitude (1/5 million) District transfer map, taking the Qing Gouzi section as an example, the use of previous sections of the trilobite biological fossil data collected in accordance with the Based on the principle of multiple stratigraphic division, preliminary stratification of biostratigraphy units was conducted, and five formal biological strata units - delineation zone and six informal biological strata - containing biological fossil strata were established.