PROGERESS AND PROPLEMS IN THE STUDY OF CONODONT BIOSTRATIGRAPHY IN JILIN PROVINCE

The study of conodont biostratigraphy in central Jilin Province has made some progress in recent years.The depositional age of the Erdaogou,Shoushangou,Daheshen and Fanjiatun formations as well as Monodiexodinafauna has been determined by conodonts.New conodont data have been recovered from Jilin Province,but much more work remains,and there is virtually no information about Silurian and Devonian conodonts in Jilin Province.Future work should focus on the Shifeng,Wanyue,and Shihuiyao formations in the Yiyun area and on the Wangjiajie Formation in Yongji County.The Mopanshan section should be targeted for a detailed analysis of Carbonifeous conodont biostratigraphy.We recommend a more extensive collection of conodont samples,and greater efforts to improve fossil extraction techniques,especially for slightly metamorphosed rocks.