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一、前言青海省柴达木盆地东北缘(简称柴东北缘)的下奥陶统,主要分布在欧龙布鲁克山、石灰沟和大头羊沟各处(图1),是具有稳定型沉积特征的地层单元之一。解放后,孙殿卿(1956年),王水(1957年)、穆恩之等(1958年)先后在该区做过地层研究工作,以穆氏等人的研究较详,为以后的地层工作奠定了良好的基础。自75年以来,第一区调队在柴东北缘地区开展了1/20万怀头他拉幅,托素湖幅和大
I. Preface The Lower Ordovician in the northeastern margin of the Qaidam Basin in Qinghai Province (shortened to the northern margin of the Chai Dong) is mainly distributed throughout the Oolongbrook, Limeigou and Dadouyang furrows (Figure 1) and is characterized by stable sedimentary features Of the strata unit. After the liberation, Sun Dianqing (1956), Wang Shui (1957), Mu En, etc. (1958) have conducted stratigraphic research work in this area, with more detailed studies by Mu and others, and laid the foundation for future stratigraphic work A good foundation. Since 75 years, the first district transfer team in the northern edge of the eastern part of Chai carried out 1/200 million head tenterhook,