摘要
一、绪言 滇东区寒武紀地层,近六十年有不少人进行过研究。其中以卢衍豪(1941)对昆明附近的早寒武世地层的研究較詳,划分为三个层、四个化石带和两个亚带,于是奠定了本区下寒武統分层的基础。1959年第一次全国地层会議并决定将卢氏的分层提升为阶,作为下寒武統对比的标准,尙有下列几点争論:1.滇东区中、上寒武統是否存在?
The Lower Cambrian of China is well developed in Eastern Yunnan,and was first studied and classified by Y.H.Lu in 1941.Recently,Middle Cambrian trilobites have been found from the upper part of the Lungwangmiao formation(s.1.)by the geologists of the Geological bureau of Yunnan and the Geological Department of Kunming Technical Institute respectively,thus the upper boundary of the Lungwangmiao formation and the Middle Cambrian of Eastern Yunnan still as a subject is open for discussion.Regarding to the Cambrian of China,Sun(1923—61)and Lu(1941—59)failed to find to the Middle Cambrian of Eastern Yunnan.On account of the deficiency of the analysis of the trilobite fossils and sedimentation,the classification and the establishment of the stages of the Lower Cambrian of Eastern Yunnan remain as a subject for further study.Based upon the investigation of several type of Cambrian sections in Eastern Yunnan,we arrived tentatively at the following conclusion.1.The existence of the Middle Cambrian in Eastern Yunnan is definitely proved.2.ne Lower Cambrian of Eastern Yunnan may be divided into four formations,of which Meishucun formation is so named for the phosphate bearing beds.3.Judging from the lithological character we have recognized that the subsiding area of Eastern Yunnan is considered still in the late Early Lower Cambrian epoch.4.Paragraulos and Redlichia chinensis should not be used as two zoning fossils for the Tsanglangpu and Lungwangmiao formations respectively.5.The Middle Cambrian of Eastern Yunnan might be correlated witll the Middle Cambrian of Kueichow,because Kunming was a subsiding area in the Middle Cambrian epoch.6.We have restudied and redefined some type-sections of the Lower Cambrian of Eastern Yunnan.The classification of the Cambrian of Eastern Yunnan is given as follows:Middle Cambrian(6)Shuanglungtan formation 6 Proasaphiscus zone.(5)Yunshantsun formation 5 Paragraulos-Kaotaia zone.Lower Cambrian(4)Lungwangmiao formation 4 Micmacca-Redlichia murakamii zone.(3)Tsanglangpu formation 3 Palaeolenus zone.(2)Chiungchussu formation 2 Yunnanocephallus-Redlichia walcott zone.(1)Meishutsun formation 1 Hyolitkes-Salterella zone.
出处
《地质学报》
1964年第2期137-155,共19页
Acta Geologica Sinica
