云南宁蒗、丽江地区位于康滇古陆西缘,在扬子区之内。这一地区石炭系出露良好, 剖面连续完整,其中红桥一带石炭系全为碳酸盐沉积,并产有丰富的(?)、腕足类、珊瑚等化石,因此我们选择了该区宁蒗老龙洞剖面进行系统的牙形石生物地层研究。宁蒗老龙洞剖面系1979年薛代福、郭常喜首次测制,在采集各门类化石的同时采集了28件牙形石样品,这为该区今后的研究工作奠定了良好基础。嗣后,作者于1981年到该剖面系统采集牙 Ninglang, Yunnan, Lijiang region is located in the western edge of Kang Yunnan, within the Yangtze area. The Carboniferous is well exposed in this area with a continuous and complete profile. The Carboniferous in Hongqiao area is all carbonate sediments, and is rich in fossils of?, Brachiopods, corals and other fossils, so we chose this area 宁 蒗A systematic study of the conodont biostratigraphy at Laolongdong section. The section of Old Longdong in Ninglang was first measured by Xue Defu and Guo Changxi in 1979. 28 samples of conodont were collected at the same time in collecting all kinds of fossils, which laid a good foundation for the future research in this area. Subsequently, the author collected teeth in the section system in 1981